insulationg high alumina bricks are also called thermal insulation refractory bricks in some places, and thermal insulation refractory bricks in some places. Its function is to make thermal insulation walls or thermal insulation walls. What are lightweight high-alumina bricks? What are the uses of lightweight high-alumina bricks and the performance characteristics and differences of heavy-duty high-alumina bricks?

insulationg high alumina brick

What is insulationg high alumina brick?

Lightweight high-alumina bricks, also known as high-alumina thermal insulation bricks, are lightweight refractories with an alumina content of more than 48%, mainly composed of mullite, glass phase or corundum. Bulk density 0.4 ~ 1.35g/cm3. The porosity is 66% to 73%, and the compressive strength is 1 to 8MPa. Thermal shock resistance is good.

Lightweight high-alumina bricks are usually made of high-alumina clinker and a small amount of clay. After grinding, they are poured and formed in the form of mud by gas generation method or foam method, and fired at 1300-1500 ℃. Sometimes industrial alumina can also be used to replace part of the bauxite clinker. It is used for the lining and heat insulation layer of masonry kilns, as well as the parts where there is no strong high temperature molten material erosion and scouring. When in direct contact with the flame, the surface contact temperature shall not be higher than 1350℃.

Insulationg high alumina brick performance:

Refractoriness

The refractoriness of lightweight high-alumina bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790 ℃, which is a high-grade refractory material.

softening temperature under load

Because of the high Al2O3 in high alumina products, less impurities and less fusible glass body, the softening temperature under load is higher than that of clay bricks, but because mullite crystals do not form a network structure, the softening temperature under load is still lower than that of silica bricks.

Slag resistance

Lightweight high-alumina bricks contain more Al2O3, which is close to neutral refractory materials, and can resist the erosion of acid slag and alkaline slag. Because it contains SiO2, the ability to resist alkaline slag is weaker than that of acid slag.

The difference between light high alumina bricks and heavy high alumina bricks:

insulationg high alumina bricks are usually called thermal insulation refractory bricks, also called thermal insulation refractory bricks. First of all, from a literal understanding, the weight of lightweight high-alumina bricks and heavy high-alumina bricks are completely different products. Lightweight high-alumina bricks, also known as heat-insulating high-alumina bricks, have the essential purpose of heat insulation and heat preservation. It is not in direct contact with the furnace temperature in normal use, and is a refractory brick product that is close to the furnace wall and has the effect of heat insulation and heat preservation.

Heavy high-alumina bricks, also called high-alumina bricks, are many times heavier than light-weight high-alumina bricks. They are not used for thermal insulation, but more importantly, for refractory temperature, usually during use. It is in direct contact with the flame in the kiln, so the heavy high alumina brick usually has the effect of high temperature resistance. High-alumina bauxite clinker combined with refractory clay is selected, and it is machine-pressed and fired at high temperature according to multi-stage ingredients.

High-alumina bricks are divided into three grades according to the alumina content. By adjusting the ratio of high-alumina bauxite and bound clay, the alumina content and high-temperature resistance of high-alumina bricks are guaranteed to meet different use conditions and requirements.