Alumina Bubble Bricks 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 kiln at 1800℃. Alumina hollow spheres can also be used as high-temperature and ultra-high-temperature insulation fillers, high-temperature refractory concrete lightweight aggregates, high-temperature castables, etc. Alumina 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.
Forming and Firing of Alumina Bubble Bricks
Molding methods include manual molding, vibration molding, and press molding. According to the size and complex shape of Alumina Bubble Bricks, the ingredients and forming methods are selected. Manual molding should be stratified and rammed, and the addition of each layer should not exceed 50mm. The vibration molding time is generally 2 minutes. The molding pressure of press molding is generally 50-80MPa. For molds processed by various molding methods, there is no need to add a ruler. After the semi-finished product is fully dried, the residual moisture should be less than 0.5%. Alumina hollow ball bricks are fired in a high-temperature kiln, the firing temperature is generally 1800-1850℃, and the heat preservation is 4-6h. Generally, it is to prevent Alumina Bubble Bricks from cracking during firing. When installing the kiln, consider that Alumina Bubble Bricks should not be directly impacted by the flame as much as possible. Add emulsified paraffin wax 0.5%-1.0%, plasticizer 4%-6%, high-efficiency dispersant 1%, and water generally 40%-45%. The slurry is made in a high-speed mixer, and the slurry is sent into the spray drying tower through a nozzle with a diaphragm pump for spray granulation drying. The inlet temperature of the drying tower is generally 420-440°C, and the outlet temperature is generally 120-130°C.
At the time of firing, the temperature is about 1680°C, the Alumina Bubble Brick has begun to sinter, and the bulk density and compressive strength are both high. The compressive strength is measured to reach 317.3MPa. Insulation materials are generally used to reduce heat accumulation and heat dissipation on the walls of the kiln, so as to reduce the energy consumption of the kiln. With the advancement of science and technology, many new refractory and thermal insulation materials with high-temperature resistance and high strength have emerged in recent years. The performance of Alumina Bubble Bricks is generally determined by the chemical composition, followed by the production process of alumina hollow ball bricks. Factors such as particle ratio, molding pressure, and firing temperature are also important.
Related Product Introduction
Alumina Bubble Bricks and zirconia hollow ball bricks are both heat-insulating refractory materials, also known as lightweight refractories. They are characterized by high porosity, which can generally reach 40%-85%. The bulk density is low, generally lower than 1.5g/cm3. The thermal conductivity is low, generally lower than 1.0W (m·K). Hollow ball bricks are used as heat insulation and refractory materials for industrial furnaces, which can effectively reduce the heat loss of the furnace and save energy. And because the body density is small, the weight of thermal equipment can be effectively reduced.
Regarding the alumina hollow ball brick, I will introduce it here, and I hope it will be helpful to everyone. Rongsheng refractory materials manufacturers provide customers with samples of various refractory bricks and insulation bricks, such as Alumina Bubble Bricks, mullite insulation bricks, etc., for free. As an experienced refractory manufacturer, Rongsheng Refractories not only pays attention to the expansion of its own scale but more importantly, always takes a long-term development perspective and continuously develops new refractory materials. The purpose is to continuously meet the more stringent market demand and conform to the trend of the times. Rongsheng refractory material manufacturer specializes in the production of various high alumina bricks, silica refractory bricks, magnesia bricks, magnesia carbon bricks, clay bricks, castables, and other products. Welcome customers to visit the factory and establish long-term cooperative relations.
