Furnace lining light weight JM26 heat insulating high temperature kiln thermal fireproof mullite insulating bricks

Furnace lining light weight JM26 heat insulating high temperature kiln thermal fireproof mullite insulating bricks

Lightweight mullite insulating bricks are made of high-quality and high-purity refractory materials, according to the specific gravity of the product, with organic compound fillers, vacuum extrusion molding, and high-temperature sintering to synthesize lightweight mullite products. With its light weight and excellent thermal insulation performance, lightweight mullite insulating bricks are widely used in the hot surface refractory lining or insulation layer of a variety of thermal equipment, creating conditions for improving the energy efficiency of the equipment.
High alumina refractories with mullite as the main crystal phase generally have an alumina content between 50% and 75%. The refractory temperature of mullite lightweight brick can reach above 1790℃. The starting temperature of load softening is 1600-1700℃. Pressure resistance at room temperature is slightly 70-260MPa. Good thermal shock resistance. There are two types of sintered mullite insulating bricks and fused mullite insulating bricks.
Sintered mullite insulating bricks are made of high-alumina bauxite clinker as the main raw material, adding a small amount of clay or raw bauxite as a binder, and forming and firing. Fused mullite insulating bricks use high alumina bauxite, industrial alumina and refractory clay as raw materials, add charcoal or coke fine particles as reducing agents, and are manufactured by reduction fusion method after molding. The crystalline fused mullite is larger than that of sintered mullite, and its thermal shock resistance is better than that of sintered products. Their high temperature performance mainly depends on the content of alumina and the uniformity of mullite phase and glass distribution.
A high-alumina refractory with mullite (3Al2O3·2SiO2) as the main crystal phase. Generally, the alumina content is between 65% and 75%. In addition to mullite, the mineral composition with lower alumina also contains a small amount of glass phase and cristobalite; the higher alumina content also contains a small amount of corundum. Lightweight mullite insulating bricks can be directly used for the lining of high-temperature kilns, and have been widely used in shuttle kilns, roller kilns, glass and petrochemical kilns.

Technical Data of Lightweight mullite insulating bricks