Refractory Bricks

Lightweight Mullite Fire Bricks

Feb 14,2022
Lightweight mullite brick is a new type of energy-saving refractory material, which can directly contact the flame. It has the characteristics of high temperature resistance, high thermal shock stability, high strength, and low thermal conductivity. Widely used in ceramic roller kilns, shuttle kilns, cracking furnaces, hot blast furnaces and various electric furnace linings, furnace door bricks, kiln car bricks, etc. 

The advantages of Lightweight Mullite Fire Bricks are high purity, low impurity content, high temperature resistance, direct flame resistance, corrosion resistance in various atmospheres, low thermal conductivity, low heat melting, high strength, excellent thermal shock resistance, high dimensional accuracy, and can be cut at will. The body density can be between 0.5 0.6 0.8 0.9 1.0 1.2 1.5 according to user requirements. It acts on the high temperature furnace to directly contact the flame, with good heat preservation effect, high compressive strength, and low thermal conductivity. 

It is suitable for the insulation of electric kilns, various high-temperature rotary kilns, tunnel kilns, nitrogen gas kilns, etc. The crystallization of 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. 1400 degree mullite bricks are mainly used for hot blast stove top, blast furnace body and bottom, regenerator of glass melting furnace, ceramic sintering kiln, dead corner lining of petroleum cracking system, etc.

JM23 lightweight mullite brick is a new technology introduced in my country, the latest domestic high-temperature resistant and energy-saving lightweight refractory material. Lightweight mullite fire bricks are light-weight and have good thermal insulation effects. They are high-quality and high-purity refractory powders. According to the specific gravity of the product, organic composite fillers are added, vacuum extrusion molding, and high-temperature sintering to synthesize lightweight mullite products. The light-weight mullite bricks produced by the company vary from 50% to 80% in alumina content according to different specifications.


High temperature resistance can reach above 1790℃. Load softening start temperature 1600-1700℃, normal temperature compressive strength 70-260MPa, good thermal shock resistance, high strength, low high temperature creep rate, low expansion coefficient, low thermal coefficient, resistance to acid slag erosion. And it can greatly reduce the weight of the high-temperature furnace body, transform the structure, save materials, save energy, and improve production efficiency.

Lightweight mullite fire bricks are made of imported tabular corundum and high-purity fused corundum as the main raw materials, using advanced superfine powder addition technology, mixing, drying, forming, and firing in a high-temperature shuttle kiln. Mullite lightweight bricks are widely used in equipment such as slag gasification furnaces, second-stage conversion furnaces for synthetic ammonia, carbon black reactors and refractory kilns. The product's dimensions, physical and chemical indicators, and service life all meet the customer's requirements.

According to the chemical structure of Lightweight mullite fire bricks, its outstanding properties are as follows:
1. Low thermal melting, due to low thermal conductivity, mullite series light-weight insulation bricks accumulate very little heat energy, and the energy saving effect is obvious in intermittent operation;
2. Low thermal conductivity, with good thermal insulation effect;
3. Low impurity content has very low iron box alkali metal and other oxide content, therefore, high refractoriness; high aluminum content makes it maintain good performance in a reducing atmosphere;
4. High compressive strength in hot state;
5. It can be processed into special shapes to reduce the number of bricks and joints;
6. Accurate appearance and size, speed up the masonry, reduce the amount of refractory mud, ensure the strength and stability of the masonry, thereby extending the life of the lining.

Application ranges:

Mainly used for metallurgical hot blast furnaces with high air temperature above 1400℃, parts of torpedo cars impacted by molten iron, slag line, steel-making electric arc furnace roof, glass melting furnace forge, regenerator arch, upper structure, ceramic sintering kiln, The inner lining of ceramic roller kiln, tunnel kiln, electric porcelain drawer kiln, dead corner furnace lining of petroleum cracking system, glass crucible kiln and various electric furnaces, and the wall of clarification tank can directly contact the flame.
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