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The Best Proportion of Non-Stick Aluminum Castable for Aluminum Melting Pool

2021-01-06 by globalrefractory

The aluminum melting furnace is an important piece of equipment in the aluminum processing industry, and the refractory lining, especially the non-stick aluminum castable used in the aluminum melting pool, plays a vital role in its normal operation at high temperatures. Liquid aluminum is lively and has a low viscosity. Therefore, the refractory materials in the molten pool that are in direct contact with molten aluminum are most severely damaged by molten aluminum erosion. Its quality and life will directly affect the quality of the product and the life of the aluminum melting furnace. So What’s the Best Proportion of Non-Stick Aluminum Castable for Aluminum Melting Pool?

The Best Proportion of Non-Stick Aluminum Castable for Aluminum Melting Pool

Recently, it is time to repair the aluminum melting furnace and purchase refractory lining materials. Among them, in order to prepare non-stick aluminum castable for an aluminum melting pool with excellent resistance to aluminum melt corrosion. High alumina bauxite (8~5, 5~3, 3~1, and ≤1mm) is often used as aggregate, and fine mullite powder, α-AL2O3 powder, silica fume, barium sulfate, and high alumina cement are used as powder materials. After many times of running-in between refractory manufacturers and customers, The Best Proportion of Non-Stick Aluminum Castable for Aluminum Melting Pool. the best ratio of powder was finally obtained. The content of silica fume, anti-erosion agent, barium sulfate, and cement are 3%, 3%, 4%, and 4% respectively.

Analysis of the Influence of Fine Powder on the Corrosion Resistance of Castables for Molten Aluminum Pool

The erosion of the non-stick aluminum castable by the aluminum melt first occurs in the matrix. Therefore, in order to improve the corrosion resistance of non-stick aluminum castable for the aluminum melting furnace. In this experiment, in addition to using high alumina bauxite as aggregate, the influence of fine powder in the matrix composition on the corrosion resistance of the castable for the aluminum melting pool was also studied.

The raw material in the experiment is high alumina bauxite (8~5, 5~3, 3~1, and ≤1mm). The fine powder includes mullite fine powder (≤0.088mm), barium sulfate fine powder (≤0.045mm), α-AL2O3 fine powder (d=5μm), silica fume (≤1μm), high alumina cement, and anti-erosion agent. The basic ratio of the main raw materials is 71.71% high alumina bauxite, 5.29%-19.29% mullite fine powder, 5% α-AL2O3 powder, and the remaining matrix materials are silica fume, anti-erosion agent, barium sulfate, and cement. The anti-erosion performance of the materials after the ratio is analyzed as follows.

(1) With the addition of silica fume and the increase of its addition, the corrosion resistance of the sample gradually improves. This is because the particle size of silica fume is extremely small and can be filled in the voids formed by the coarse aggregate to densify the sample. As a result, the apparent porosity of the sample is reduced, and the passage of aluminum melt into the sample is reduced. In addition, the high proportion of silica fume has high reactivity, and it can promote the sintering of the sample matrix material at high temperatures so that the sample is densified and the strength of the sample is improved. The strength of the sample affects the ability of the castable to resist the stress caused by the metamorphic layer, and the stress change makes the corrosion caused by the appearance of cracks and cracks propagation intensified. It can be seen that the incorporation of silica fume can increase the strength of the non-stick aluminum castable while also improving the corrosion resistance of the sample.

(2) When the mixing amount of barium sulfate is 2%, the corrosion resistance of the sample can be increased from scratch to nearly double, and the corrosion resistance becomes excellent. It shows that the addition of barium sulfate can significantly improve the corrosion resistance of aluminum melt.

(3) With the increase of cement content, the corrosion resistance of aluminum melt of the sample has a tendency to decrease first and then increase. This is because the cement hydration increases the water requirement of the sample, and the dehydration of the hydration product at high temperature causes the internal structure of the sample to become loose, which weakens the structure and reduces the corrosion resistance of the sample. When the cement content continues to increase by more than 6%, the introduction of CaO into the matrix increases the amount of liquid phase at high temperatures. The surface tension of the liquid phase shortens the distance between the particles and promotes the internal densification of the sample. Thereby improving the aluminum melt corrosion resistance of the sample.

Summary: Non-stick aluminum castables are used for molten aluminum pools based on materials such as silica fume, corrosion inhibitor, barium sulfate and cement. The main factor that has an obvious influence on the corrosion performance of aluminum alloy melt is barium sulfate, and as the content increases, the corrosion resistance improves. Within a certain range, with the increase of the amount of silica fume incorporated, the corrosion resistance of the castable is improved. However, if the added amount of anti-corrosion agent and cement is controlled within a certain range, it can play a better anti-melt erosion effect.

Rongsheng High-Quality Unshaped Refractory Materials Manufacturer

Rongsheng is an experienced refractory material manufacturer and sales company. Rongsheng’s monolithic refractory production line has an annual output of 80,000 tons. Customers who purchase monolithic refractories from Rongsheng manufacturers each year have both new turnkey projects and furnace refractory lining repair projects. From the customer’s purchasing experience, they have not only experienced experiments with high-priced unsuitable refractory lining products, but also low-priced refractory lining materials that are not well used. Through various searches, the Rongsheng refractory manufacturer was finally selected. The product quality is qualified and the customer service is good. Formally because of this, Rongsheng continues to accumulate experience in the matching of customer projects and refractory materials, striving to provide customers with high-quality refractory products. Save production costs for customers and improve economic benefits. To choose high-quality refractory castables products, such as non-stick aluminum castables for aluminum melting furnaces, please contact us. We will provide you with unshaped refractory products that best suit your production needs according to your specific project needs.

Why are Alumina Bubble Bricks Widely Used?

2020-12-23 by globalrefractory

Alumina Bubble Bricks belongs to a kind of ultra-high temperature material energy-saving insulation material. It uses alumina hollow spheres and alumina powder as the main raw materials, combined with other binders, and fired at a high temperature of 1750 degrees. As a refractory manufacturer, why are alumina hollow ball bricks widely used? Why recommend alumina hollow ball bricks to customers? This will start with the performance of Alumina Bubble Bricks.

Alumina Bubble Brick - Rongsheng Refractory — Alumina Bubble Brick

The Manufacturing Process of Alumina Bubble Bricks

Alumina Bubble Brick is a new type of high-temperature insulation material, which is made by smelting and blowing industrial alumina in an electric furnace. With alumina hollow spheres as the main body, it can be made into products of various shapes, with a higher use temperature of 1800°C. The mechanical strength of the product is high, which is several times that of the general lightweight product, and the bulk density is only one-half of the corundum product. Among them, the alumina powder is produced by using reliable industrial alumina as the raw material, using a new high-temperature inverted flame kiln and a scientific calcination process. Manual selection, clear classification, fewer impurities, high conversion rate, stable shrinkage rate, and good consistency.

High-Quality Alumina Bubble Bricks for Sale

The Performance of Alumina Bubble Bricks

Alumina hollow ball and its products are a kind of light refractory material with excellent high-temperature resistance and energy saving, and it is very stable to use in various atmospheres. Especially it is used in the high-temperature furnace at 1800℃. Hollow balls can be used as high-temperature, ultra-high-temperature insulation fillers, high-temperature refractory concrete lightweight aggregates, high-temperature castables, etc. Hollow ball bricks can be used for high-temperature energy-saving (>30%) inverted flame kilns, shuttle kilns, molybdenum wire furnaces, tungsten rod furnaces, induction furnaces, nitriding furnaces, etc. Obvious effects will be achieved for reducing the weight of the furnace body, transforming the structure, saving materials, and saving energy.

The specific advantages of alumina bubble bricks are as follows.

The operating temperature is high, up to 1750 degrees. Good thermal stability, the small change rate of the re-burning line, longer use.
Optimize the structure and reduce the weight of the furnace body. The high-temperature-resistant materials currently used are heavy bricks with a bulk density of 2.6-3.0g/cm. The alumina hollow ball brick is only 1.1~1.5g/cm, the same volume of one cubic meter, the use of alumina hollow ball brick can reduce the weight of 1.1-1.9 tons.
Save materials. To reach the same operating temperature, the price of heavy bricks is equivalent to that of Alumina Bubble Bricks, and considerable refractory materials are required for insulation. If alumina hollow ball bricks are used, 1.1-1.9 tons of heavy bricks can be saved per cubic meter, and 80% of refractory insulation materials can be saved.
Save energy. Alumina hollow spheres have obvious thermal insulation properties, low thermal conductivity, and can play a very good thermal insulation effect. Reduce heat dissipation and improve thermal efficiency, thereby saving energy. The energy-saving effect can reach more than 30%.

Obviously, the excellent energy-saving effect of alumina hollow spheres makes it more competitive as a lightweight refractory material. Buyers of kiln lining materials will definitely prefer such superior refractory products. Therefore, not only refractory manufacturers recommend everyone to buy Alumina Bubble Bricks, but also its own advantages that make it so widely used. Alumina Bubble Bricks are widely used, for example, in high temperature and ultra-high temperature furnaces such as petrochemical industrial gasifiers, carbon black industrial reactors, metallurgical industrial induction furnaces. And they have achieved very good energy-saving effects.

For more refractory materials products, please contact us: inquiry@global-refractory.com.

Non-stick Aluminum Castable for Aluminum Melting Furnace

2020-12-03 by globalrefractory

Non-stick aluminum castables need to be suitable for different aluminum alloy series in the aluminum melting furnace. The working temperature of the aluminum melting furnace is generally 700～1200℃, and the highest temperature of the upper part of the molten aluminum can reach 1200℃. The aluminum, magnesium, and other components in the aluminum alloy can easily react with some components of the refractory lining to form a reaction layer, and the copper, manganese, and zinc in the aluminum alloy can penetrate into the refractory castable through the pores to form a modified layer.

Why must refractory castable for aluminum melting furnace use non-stick aluminum castable?

With the continuous development of the metal smelting industry, aluminum products have been applied to various industries, and the thermal kilns used in aluminum smelting are collectively referred to as aluminum melting furnaces. The melting point of aluminum is 660°C, which is relatively low among many metals. However, aluminum is highly active and has a very strong penetration ability, which can easily corrode the refractory castable lining and change its performance, causing cracks and peeling. Therefore, it is very important to choose the material of refractory castable.

Reasons for damage of aluminum melting furnace lining

During the operation of the aluminum melting furnace, the non-stick aluminum castable can resist the falling off of the reaction layer and the deteriorated layer formed by the aluminum solution. On the one hand, it does not pollute the aluminum alloy, and on the other hand, it increases the service life of the lining of the aluminum melting furnace. In the current common aluminum alloy series on the market, because the types and contents of the alloys in each series of aluminum alloys are different, the alloy components in the aluminum alloys have different damage to the non-stick aluminum castable. In summary, there are three main reasons for the damage of the aluminum melting furnace lining.

1) Although the temperature of the molten aluminum in the furnace is not high, it is very penetrating. The very active aluminum melt slowly penetrates into the furnace lining through the pores and fine lines of the furnace lining, physically and chemically react with the furnace lining, and slowly loosens and peels off the furnace lining. The cracks of the furnace lining increase and fall off.
2) The aluminum melt in the furnace reacts chemically with the furnace lining to form adhesion. Long-term adhesion increases, forming nodules and causing damage to the furnace lining.
3) During the process of adding raw materials or slagging, bauxite or aluminum slag will cause a certain degree of impact and wear on the furnace lining, causing physical loss of the furnace lining.

Characteristics of Non-Stick Aluminum Refractory Castable

Non-stick aluminum refractory castables are made of special grade high alumina bauxite, brown corundum, kyanite, alumina powder, calcium aluminate cement, silica powder, and special additives, which are mixed in strict proportions. It is a low cement refractory castable specially developed according to the use requirements of an aluminum melting furnace. It has the performance characteristics of low impurity content, high density, high strength, high corrosion resistance, high permeability resistance, and no infiltration by molten aluminum. Table 1 shows the performance indexes of non-stick aluminum refractory castables.

Table 1 Properties of non-stick aluminum refractory castable

Items		High-Strength Non-Stick Aluminum Castable
Al₂O_{3 +}SiO₂ (%)		86
Bulk Density (g/cm³)	110℃ × 24h	2.7
Flexural Strength (MPa)	110℃ × 24h	9
Flexural Strength (MPa)	1200℃ × 3h	11
Crushing Strength (MPa)	110℃ × 24h	45
Crushing Strength (MPa)	1200℃ × 3h	83
Linear Change (%)	1200℃ × 3h	±0.4

Application of Non-Stick Aluminum Refractory Castable

Non-stick aluminum refractory castables can be used for aluminum melting furnace bottoms, lower furnace walls, slagging slopes, chutes, aluminum ladle, and other severely corroded parts due to their superior aluminum corrosion resistance. After use, the erosion and nodulation of molten aluminum are largely controlled and delayed.

Rongsheng Refractory Manufacturers

Non-stick aluminum refractory castable, as a tailor-made lining material for aluminum melting furnaces, has been applied to the construction of aluminum melting furnaces in many large aluminum factories and aluminum alloy processing enterprises. At present, user feedback has been good. Its superior performance effectively prolongs the life cycle of the aluminum melting furnace for more than 10 months. Rongsheng refractory material manufacturer, advanced automatic unshaped refractory material production line, with an annual output of 80,000 tons. Customers in more than 60 countries all over the world, for example, Russia, South Africa, Kazakhstan, Philippines, Chile, Malaysia, Uzbekistan, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, etc. Rongsheng’s high-strength refractory castables, refractory plastics, and non-stick aluminum castable products on Rongsheng’s production line have a high frequency of orders and customers’ return orders. If you are interested in our Rongsheng refractory manufacturer or want to purchase indefinite refractory products, please contact us. We will provide you with services according to your specific needs.

Why do Cracks Appear after the High Alumina Castable Lining is Baked?

2020-11-26 by globalrefractory

The oven-drying is a vital link after construction and before the operation of high alumina castable. The oven-drying directly determines the future service life of the kiln. When the high-aluminum castable is in the oven-drying, the oven-drying should be prepared, the oven-drying time must be controlled, and the furnace heating curve, etc., all need to be operated under strict conditions. Irregular operation of the oven-drying may cause engineering quality accidents such as cracks in the castable.

High Alumina Castable Refractory - Rongsheng Company — High Alumina Castable Refractory

Is it normal for the castable to have cracks after the oven-drying? What are the reasons?

Under normal circumstances, after the oven-drying is finished, the kiln can operate normally after passing the project acceptance, and the castable can reach its own performance within the use temperature range. There are three main reasons for the cracks in the castable after the oven-drying.

The amount of water added is not well controlled when the high-aluminum castable is wet mixed and stirred. Adding too much water leads to insufficient bonding of the castable, which causes the castable to fall off. Adding too little water will greatly weaken the performance of the castable. Therefore, the amount of water added must be added in proportion and strictly in accordance with the instructions on the instructions.
When curing high-aluminum castables, the curing time is not enough, resulting in the failure of the strength of the formed castables. Under normal circumstances, when the temperature is higher, the curing time of the castable is 24 hours. In colder winters, the curing time of castables is 48 hours. Due to the low temperature, a small amount of coagulant will be added to speed up the setting speed of the castable.
When the castable is in the oven-drying, the temperature rises too fast. When the castable is in the oven-drying, the boiler heating curve must be controlled. When drying the furnace, the construction personnel will often formulate the furnace curve according to the boiler situation. In the oven-drying, strictly control the heating temperature to avoid the phenomenon of rapid heating and rapid cooling.

After baking, if the cracks in the castable are not obvious or serious, it needs to be checked in time and repaired with the same castable. If the crack is large or the castable falls off, the construction personnel need to make a solution to the problem. And it needs to be repaired with new castable.

The oven-drying after the construction of the high-aluminum castable is a very important factor. Similarly, when purchasing castables, how to purchase high-quality high-aluminum castables is also very important.

High Alumina Castable - Rongsheng Supplier — Rongsheng High Alumina Castable for Sale

How to distinguish the quality grade of high aluminum castable?

High-alumina castable is the most used castable among refractory castables. The quality grades of high-aluminum castables produced from different raw materials are not the same.

How to distinguish the quality grade of high aluminum castable? By the manufacturer, there are many methods, the most important of which is to distinguish from the aspects of aluminum content, body density, porosity, compressive strength, and load softening temperature.

First, it is the index of aluminum content. The higher the aluminum content of the high-aluminum castable, the higher the quality level of the castable. The high aluminum content indicates that the raw materials used have high purity and low impurities.

Body density is also an important indicator of the quality of high alumina castables. The higher the volume density, the higher the density of the high-aluminum castable, the higher the wear resistance and erosion resistance. The bulk density and porosity of high-alumina castables are also closely related to the composition of the raw materials.

The flexural strength at room temperature is the ability of high-aluminum castables to withstand bending. Moreover, flexural resistance plays a decisive role in high-temperature strength. The higher the purity of the raw material, the higher the bending resistance and the higher the temperature it can withstand. Therefore, the flexural strength is also a way to distinguish the priority of castables.

The compressive strength at room temperature can also indirectly show the wear resistance and impact resistance of high-aluminum castables. The higher the strength, the better the abrasion resistance, erosion resistance, and erosion resistance. The load softening temperature of high aluminum castables is also an item that cannot be ignored. The higher the load softening temperature, the lower the probability of deformation of the castable. The high softening temperature under load is sufficient to prove the structural strength of the castable under the conditions of use.

The performance indexes of aluminum content, bulk density, and load softening of high-aluminum castables are the best way to distinguish castables. When selecting high-aluminum castables, different grades of castables should be determined according to the use temperature and the degree of acid-base corrosion. This makes the best use of it, and also reduces costs reasonably.

Acid-Resistant Bricks and Refractory Castables for Chimney Masonry

2020-11-24 by globalrefractory

When buying refractory materials for chimney masonry, is it better to choose acid-resistant bricks or acid-resistant castables? If the purchaser does not have a very clear demand, they will generally wander between the two. Chimney acid-resistant bricks belong to shaped refractory materials, refractory bricks. It has good acid resistance and flue gas erosion resistance. Its structure is compact, the surface is smooth and clean, and it has excellent acid resistance. However, it is brittle, poor in impact resistance, low thermal stability, and easy to crack when exposed to sudden cold and sudden heat. Some manufacturers of refractory materials have made a summary of the refractory materials for chimneys, which are rough as follows.

Question: Is it better to use acid-resistant bricks or acid-resistant castables for chimney masonry?

Which is better for the boiler chimney castable or acid-resistant brick? Castables and acid-resistant bricks have their own advantages. The refractory manufacturer recommends that you read the following in detail so that you can clearly know what kind of product is more suitable for the boiler chimney. Is it better to use castables for boiler chimneys or acid-resistant bricks?

The choice of chimney lining has an important influence on the construction conditions of the chimney. For example, the construction period, local environment, and other conditions affect the choice of lining materials. How to complete the project within the specified construction period? This needs to choose the lining material according to the local environment, temperature, construction conditions, and economy.

Generally speaking, when the height of the chimney is higher than 100 meters, acid-resistant castable is used as the lining, and when the height of the chimney is lower than 100 meters, the acid-resistant brick is used as the lining. No matter what kind of lining, the cylinder construction adopts a single slip form scheme, with an average of 2~3m/d and the slip form is completed in 60 days. After the cylinder sliding form is completed, the lining masonry will not affect the construction of surrounding buildings. Acid-resistant bricks are more complex than acid-resistant castables, so there will be no material returning to alkali after masonry.

When using acid-resistant castables, the castable must be baked in time to drain the free water in the castable. Before the alkali metal and alkaline earth metal substances are converted into hydroxides and migrate, they will react with each other to form stable compounds, thereby preventing the phenomenon of back alkali.

Acid proof brick — Acid-Resistant Bricks for Chimney Masonry

Choose castable or acid-resistant brick for the lining of the boiler chimney?

The traditional chimney project is lined with acid-resistant bricks. In order to reduce the cost and investment, the project plans to use refractory castables as the lining. Refractory castables are characterized by their low bulk density (1/3 of acid-resistant bricks), reducing the amount of chimney wall concrete and foundation steel bars, and low thermal conductivity (castables are 0112W/m·k, acid-resistant bricks are 019W/m·k). There is no need to add a heat insulation layer, which is more economical in design than acid-resistant bricks. Moreover, the performance of the castable is similar to that of the concrete. By combining the embedded steel bar and the concrete, the overall force performance is better. Compared with the economic investment of acid-resistant bricks and refractory castables, the price of refractory castables can save tens of thousands to hundreds of thousands based on the price of acid-resistant bricks. And the running time is long, so it is recommended to use boiler chimney castable as the lining body.

How to choose the lining of the power station boiler chimney?

As the flue gas discharged from the power station boiler chimney is saturated with water after wet deacidification, the flue gas temperature drops to between 50°C and 70°C, and it also contains a small amount of corrosive media such as sulfuric acid and entrained chloride. Due to the strong permeability of low-concentration sulfuric acid and chloride, the corrosion and damage to the inner wall of concrete are stronger than that of high-concentration sulfuric acid solution. Therefore, higher requirements are put forward for the anti-corrosion performance of the chimney lining after wet flue gas desulfurization in coal-fired power plants. The castable for the boiler chimney of the power plant produced by the Rongsheng refractory material manufacturer can be directly poured into the inner layer of the chimney to play a role in heat preservation, heat insulation, acid resistance, and corrosion resistance. And it has the advantages of relatively high compressive strength, which replaces the original traditional light bricks and acid-resistant bricks, and is convenient for construction.

Construction plan for stacking chimney with chimney lined with acid-resistant bricks

The construction plan for stacking chimneys with acid-resistant bricks lining the chimney introduced by the acid-resistant brick manufacturer, I hope will help the one which is looking for the solutions for the construction for the chimney’s lining masonry.

First, clean the inner wall of the chimney with a high-pressure water gun. If the old chimney has been preserved before, the damaged area needs to be cleaned up, and the intact part only needs to be cleaned. Then use special acid-resistant cement to make putty and repair the surface until the application is smooth and smooth. Then the surface of the acid-resistant clay is completely and thoroughly treated with corrosion protection. Using the traditional hoop bucket principle, the hoop ceramic lining with a thickness of 5mm is made outside the anti-corrosion layer, and the ceramic hoop ceramic lining is filled with low-temperature enamel and the surface is enameled.

According to this method, the ceramic-lined chimney is made of a chimney lining with acid-resistant bricks. The inner wall is smooth and beautiful, with four layers of anti-corrosion and excellent corrosion resistance. This should be the first choice for chimney corrosion protection in power generation companies.

The Development of Alumina Silicate Refractories

2020-11-19 by globalrefractory

Alumina Silicate refractory materials can be divided into the following three types according to the alumina content. Semi-silica (15%-30% alumina), clay (30%-48% alumina), and high alumina (alumina greater than 48%). In addition to making fired bricks or unfired bricks, it can also make molten cast products, as well as various grades of ramming materials, castables, refractory coatings, and other unshaped refractory materials.

Advantages of Alumina Silicate Refractories

Alumina Silicate refractories have the advantages of a lightweight, high-temperature resistance, thermal stability, low thermal conductivity, small heat capacity, good mechanical vibration, good heating and heat preservation performance, and good expansion. Aluminum silicate fiberboard, aluminum silicate fiber felt, and aluminum silicate fiber blanket products made by special treatment. Model sealing materials have the characteristics of low thermal conductivity, high-temperature resistance, lightweight, long service life, high tensile strength, good elasticity, and non-toxicity. It is a new type of material to replace asbestos and is widely used in thermal insulation in metallurgy, electric power, machinery, chemical, and other industries.

The Development of Alumina Silicate Refractories

Alumina Silicate refractory materials have a long history, and aluminum silicate refractory materials have been used in the bronze period about 1700 BC. Later, due to the rise of iron smelting and silicate industries, aluminum silicate refractories changed from natural raw materials to products such as saggers, crucibles, and blocks. After the nineteenth century, Alumina Silicate refractories became the main material for various furnace linings.

Since the 1960s, aluminosilicate refractories have developed into high-quality, high-purity, and indeterminate varieties. Since the founding of the People’s Republic of China, my country has manufactured many high-quality products of the world’s advanced level and has gained rich experience in the production of Alumina Silicate refractories. Refractory materials are mainly aluminum silicate, accounting for more than 85% of the total refractory materials, and high-aluminum and amorphous refractories are also increasing year by year. Since the 1980s, products in the steel industry have continued to emerge. Up to now, the lining of steel drums still uses aluminum silicate. The ladle used by Anshan Iron and Steel is lined with A120, which is more than 45%. Clay or high-alumina bricks are also used for steel. Many high-alumina bricks are used in the United States and Japan, which have been used more than 100 times. The life span of my country’s primary-fired high alumina bricks is 31-47 times. Clay bricks for coke ovens are of similar quality to similar products in Japan. Our homemade mullite slabs are better than non-fired high alumina bricks, such as corrosion resistance, no cracks, smoothness, and non-sticky slag. The mullite bricks used in torpedo bags developed by our country exceed the Japanese standards. Mullite plug bricks can be used in steel mills for more than four hours.

In the past 20 years, silicate aluminum refractories have moved towards high quality and high efficiency. Clay bricks are decreasing year by year, and high-alumina products are increasing year by year. Although the total amount of ordinary clay bricks has a downward trend, their role in industrial kilns and thermal equipment has not decreased. In the iron and steel industry, mullite or corundum bricks are widely used in the hearth, waist, and belly of the steel industry. Ordinary clay bricks or high-alumina bricks are generally still used on the main part of the blast furnace. The aluminum oxide of fireclay bricks used in Japanese blast furnaces has increased from 38% to more than 42%, the apparent porosity has been reduced from 20% to 10%, and the compressive strength has more than doubled. The high-density clay bricks or kaolin bricks used in the Soviet Union have a life span of more than 10 years. The walls of medium-sized blast furnaces in the United States are still using dense clay or high alumina bricks. Clay bricks and high alumina bricks are also used in blast furnaces in West Germany, France, the United States, and Italy.

Most hot blast stoves in various countries use alumina silicate firebrick materials. When the air temperature is lower than 900 ℃, ordinary clay bricks are generally used. When the wind temperature is 900-1100℃, high alumina bricks, mullite bricks, or sillimanite bricks are used for furnace lining and checker bricks. When the wind temperature is as high as 1100℃, high alumina bricks and mullite bricks are generally used as furnace lining and checker bricks. There are semi-silica, clay, high alumina bricks, and mullite bricks in American hot blast stoves.

The Development Trend of Alumina Silicate Refractories

In order to adapt to the development of modern technology, refractories are also facing a new development. This requires refractory materials to use raw materials with high chemical purity to make the products dense and resistant to sudden temperature changes. It can withstand the corrosion of molten metal in a vacuum and various atmospheres, and has high mechanical strength at high temperatures, and can resist creep and other properties.

The basis for the development of high-quality Alumina Silicate refractory materials is high-quality Alumina Silicate refractory raw materials. In recent years, foreign countries have kept improving the quality requirements of aluminum silicate refractories. A lot of research has been done in the aspects of beneficiation, purification, synthesis process, and calcination technology. The purity of raw materials is improved, the degree of sintering is improved, the composition structure is uniform, and the performance is stable, which provides a foundation for the development of high-quality, high-purity, and high-efficiency products. The research and development of new lightweight Alumina Silicate refractories and amorphous aluminum silicate refractories is a focus of future development of aluminum silicate refractories. In recent decades, the rapid development of monolithic aluminum silicate refractories and the expansion of their use range is a major breakthrough in the production of Alumina Silicate refractories. This material is characterized by a simplified production process, a simple firing process, energy-saving, easy construction, and can adapt to various complex furnace body structure requirements.

Rongsheng‘s new fully automatic monolithic refractory castable production line will provide high-quality monolithic refractory products for the lining of your kiln equipment. Provide better solutions for your furnace repair. For more detailed information, please contact us.

What are the Names of Refractory Materials?

2020-11-182020-11-18 by globalrefractory

What are the names of refractory materials? The question itself is inaccurate. For example, there are many kinds of cars, such as cars, vans, off-road vehicles, trucks, and so on. And there are many cars with different brands or shapes in various fields, but they are collectively called cars. Various refractory bricks or castables are collectively referred to as refractory materials. It cannot be specified which type or types of refractory bricks and castables. Because of the different fields of use, the refractory materials used in thermal equipment are also different.

Refractory materials are divided into shaped products and unshaped products in terms of shape and are divided into three categories: ordinary, high-grade, and special-grade in temperature. The chemical properties are divided into acidic, neutral, and alkaline. Refractory insulation bricks and lightweight thermal insulation castables are called thermal insulation or thermal insulation refractory materials. No matter which method is used to define, they are called refractory materials.

Common acid-resistant bricks, oxide ceramics, refractory insulation bricks, acid-resistant refractory bricks, refractory slurries, refractory castables, lightweight thermal insulation castables, etc. Someone among them raised the question: How many names are there for the above refractory materials? He also cited a similar answer to refractory insulation bricks, also called insulation bricks.

There are many names for different refractory materials, and they are very complicated. And many materials are called differently because of different regions. For people who understand refractory materials and those who do not understand refractory materials, because they have different understandings of the same kind of refractory materials, there may be different names. For example, a common mullite insulation brick. Some people call it K23 fire brick and K28 fire brick; others call it JM23 insulation brick and JM28 insulation brick. There are others called SK32, SK34, SK36, SK37, SK38 refractory bricks, and so on. What they said is the same type of insulation brick products, and there may be slight differences in specific indicators. Therefore, as a refractory manufacturer and seller, no matter what the name of the refractory product is, we first need to confirm with the customer the application furnace type, use position and use temperature of the product that the customer needs. According to the customer’s specific needs, we will provide the customer with refractory materials that meet his thermal furnace equipment production needs.

Rongsheng Refractory Bricks Manufacturer

What are the thermal properties in refractories?

From the point of view of definition, inorganic non-metallic materials with refractoriness greater than 1580 ℃ are called refractory materials. Refractories are part of the material industry, and they are named after they are used in thermal kilns. So what are the thermal properties in refractories?

(1) Thermal expansion

The thermal expansion of refractory materials refers to the length change of the product during heating.

The expansion (or contraction) of refractory materials as the temperature changes in use will seriously affect the size, tightness, and structure of the thermal equipment masonry, and even damage the masonry. In addition, the thermal expansion of refractory materials can also reflect the thermal stress distribution and size of the product after being heated, crystal transformation and phase transformation, the generation of microcracks, and thermal shock resistance.

(2) Thermal conductivity

Under the condition of the unit temperature gradient, the heat flow rate per unit area of the material is defined as the thermal conductivity of the refractory material.

In actual production, the general thermal equipment needs to consider the amount of heat loss after passing through the refractory, and it is necessary to calculate the insulation effect of the insulating refractory. In some muffle furnaces and coke ovens, the partition walls of refractory materials are also required to have higher thermal conductivity. Therefore, the thermal conductivity of refractory materials is one of the key considerations in the design of thermal kiln lining. The pores in the refractory product have a great influence on the thermal conductivity. Within the temperature limit, for the porosity within a certain range, the greater the porosity, the smaller the thermal conductivity, and the better the thermal insulation effect.

Use Plastic Refractory Material In Furnace

2020-10-31 by globalrefractory

$Plastic Refractory Material - Rongsheng Refractory Supplier$

Figuring out how to do this is the province of true professionals. Many people are the do-it-yourself type. There is a lot of merit to being a do-it-yourself type. There are also cases where doing it yourself is not the best idea. There are many scenarios where a professional will be of great assistance. When it comes to this kind of thing, using a professional is the best approach of all. Plastic refractory material in your furnace is something that you need to talk to a professional about. Luckily, this article will point you to the right professional will be able to help you.

One of the first things that you need to consider is who you need to talk to. We have already suggested talking to a professional. One very important thing you have to realize is that not all professionals are created the same. It is the same in every industry. You have people who are pretty much average at what they do representing the book of what you’re fine. You have a minority who is plain awful at what they do. You have a minority who is great at what they do. Most people are looking for someone great at the price of the average company. Sometimes you’re able to find that and sometimes you’re not. Never skimp on quality information or help.

Finding this company can be difficult at times, but it does not have to be. It becomes a lot easier to find these kinds of companies when you know how to do the proper research. Similar to how a great Fisher knows where to cast his hook, you need to know where to cast yours. You need to know how to find quality companies. It is not just for this type of product, for services and all different things that you will look for throughout your life. This type of information is very universal. Universality of this information shows its true value and its importance. If you master the things that we talk about in this article you’ll always be able to find great help and wonderful products.

We always talk about reputation every last one of our articles. Some people probably think that we have ran out of things to talk about, but that is not the truth. Instead, we talk about these concepts because they are foundational and the most important things. These concepts are the ones that define the best company and the best products. When it comes to reputation it is the most trustworthy information that you can find. Remember that reputation is created by customers and not the business itself. Instead it is the collection of thoughts, written, type, video, and all the different types of reviews that you can find on the Internet. It is about experience and not marketing. How a company treats one customer gives you a lot of clues as to how they will treat you. When it comes to products, the collection of experience explains how the product will likely work for you.

So do your homework, look into the reputation of a company like ours and you will know that you have the right company for job.

What’s The Production Principle Of Magnesia Chrome Brick

2020-10-31 by globalrefractory

$Magnesia Chrome Brick - Rongsheng Refractory Factory$

There is a specific type of brick that is made of MgO and Cr2O3 that is called a refractory magnesia chrome brick. If you have not use these before, these are designed for cases where there is extreme heat. They will be semi-bonded, fused together, allowing them to be much more resilient. They can handle sintering temperatures at about 1700°C which makes them one of the more durable bricks that you can use for different purposes. Here is an overview of the production principle for magnesia chrome bricks, and why you might need to use them for different applications.

How Pure Should These Be?

It is important to use a business that has the ability to add at least 90% magnesia oxide content. By doing so, its ability to handle high amounts of heat and are very shock resistant. Slag erosion is also not a problem. They can be used for permanent linings for electronic or open hearth furnaces. If you have ever looked into a furnace, this is the type of brick that you are going to see inside of the furnace on the top and on the sides. They can also be used at the bottom, it even in steelmaking furnaces, and are very useful with a glass furnace as well.

The Production Principle Of These Bricks

The main thing to consider is the amount of magnesium oxide that is part of the content of the brick. This is the reason it is able to be used in many different types of furnaces related to metallurgy and similar types of trades. You can use these with the tunnel kiln, or even a rotary kiln, and complete all of your projects without any worry of things burning down. That’s because they are able to withstand these high amounts of heat, working perfectly as an insulating fire brick that is used all over the world.

How To Get These For A Good Price

You can get these for an exceptional price. They are very good to use with projects that will require extreme amounts of heat when producing metal, glass, or other types of cement or brick related materials. Whether you are replacing what you have, or if you are building something that is new, you can always benefit from magnesia chrome bricks. Some of these companies are located in the Orient where you can get these furnaces for less, as well as the bricks if you would like to buy them there. Most people are looking for the machines that can produce them if they are creating these bricks for people in their local city or community.

If you look at the many different companies that sell these furnaces, as well as the bricks, you will likely find someone that is offering everything for a reasonable price. These are the type that you want if you are rebuilding or creating a new type of furnace to create different products made from glass, steel, or if you are producing bricks as well. If you have never use these before, the companies that you buy them from are very helpful. They will provide you with instructions. It will allow you to quickly find the magnesia chrome bricks that you need, or the machines that you need to use for your business.

The Benefits Of Insulating Bricks In Blast Furnaces

2020-10-16 by globalrefractory

$Insulating Bricks In Blast Furnaces - Rongsheng Refractory Company$

Blast furnaces get very hot and if you are working with blast furnaces in your job you are going to want to make sure that you use the right insulating bricks. The right bricks are going to make a big difference in how your furnace works and you are going to enjoy superior results when you use insulating bricks.

The bricks protect the furnace from the extreme heat and they stop the furnace from cracking and splitting. High quality bricks are going to save you money because the bricks will last longer and give you better results. When you are working with a blast furnace it is very important that you are doing everything you can to protect the furnace so you don’t have to worry about problems.

You can find blast furnaces in many types of industrial applications and there are many industries that use blast furnaces on a regular basis. The furnaces are strong and they can handle a lot of heat, but it is important that they are lined properly if you want to make sure that they are going to be strong. The last thing you want is for the furnace to fail because if it does you are going to have to pay for expensive repairs.

The repair costs for the furnaces are high and they can really set you back. If you are going to be using a furnace at your job you have to make sure that the furnace is going to last for a long time and that it is going to require minimal maintenance costs because you don’t want to be paying for repairs all the time. The furnaces can last a long time if you take proper care of them and they are going to last almost forever.

Your furnace is going to work great for a long period of time when you use the right insulating bricks and the bricks are going to absorb the heat and reduce the stress on the furnace. Insulating bricks are easy to use and you just have to make sure that you install them the right way.

Make sure you hire an installer that really knows what they are doing so they can get you the right bricks and you know they are going to install everything the right way. The furnaces operate at very high temperatures and it is important that you keep your furnace maintained so you can get the most use out of it. A good furnace is going to help you make more money and it is also going to make your business more reliable since you won’t have to worry about the bricks cracking.

The blast furnace has to deal with a lot of stress and it is important that you keep it operating smoothly by ensuring that the furnace has enough bricks to keep it operating properly. When you are ready to use the furnace make sure that you heat it up slowly to reduce the risk of cracking the bricks.