Non-stick Aluminum Castable for Aluminum Melting Furnace

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

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.