Application of high alumina bricks in kiln industry

Lightweight high-alumina bricks are currently one of the ideal heat-insulating refractory materials. They have the characteristics of high compressive strength, low thermal conductivity, good insulation performance and low price. They are now widely used in porcelain monastic kilns and roller conveyors. Kiln, shuttle kiln, wall kiln are not used in various heating furnaces, coke ovens and other thermal equipment in the steel industry to heat treat materials and have broad market prospects.

Lightweight high alumina bricks are also called high alumina insulation bricks. Lightweight refractory materials with an alumina content of more than 48% are mainly composed of mullite and glass phase or corundum. The bulk density is 0.4-1.cm3, the pore density is 66%-73%, and the compressive strength is 1-8MPa. Good thermal shock resistance. Usually, a small amount of clay is added to the high-alumina bauxite material. After grinding, it is poured into a mud shape through the gas generation method or foam method, and then fired at 1550-1600°C. Sometimes, industrial alumina can be used to replace part of the bauxite processing material. It is used for the inner and warmer layers of masonry kilns, as well as parts that are not subject to strong corrosion and erosion of high-temperature molten materials. When in direct contact with flame, the surface contact temperature should not be higher than 1400°C.

Lightweight high alumina bricks, often called insulating refractory bricks, are also called insulating refractory bricks. First of all, literally speaking, the weight of lightweight high-alumina bricks and heavy-weight high-alumina bricks are completely different products. Lightweight high alumina bricks, also known as insulating high alumina bricks, have the basic purpose of heat insulation and thermal insulation. In normal use, it does not directly contact the temperature of the kiln. It is a refractory brick product close to the furnace wall and has the function of heat insulation and heat preservation.

Heavy high alumina bricks, also known as high alumina bricks, are many times heavier than lightweight high alumina bricks. They are not used for thermal insulation during use, but more importantly for fire resistance. During use, it is in direct contact with the flame in the kiln, so the heavy-duty high-alumina bricks have high-temperature resistance. High-alumina materials are selected to be combined with refractory clay. According to the multi-layer composition, they are successfully shaped and fired at high temperatures. High alumina bricks are divided into three grades based on alumina content. By adjusting the ratio of high alumina clay and bonding clay, the alumina content and high temperature resistance of high alumina bricks can be ensured to meet different usage conditions and requirements.