Alumina hollow ball bricks VS. High-alumina poly light bricks

Both alumina hollow ball bricks and high-alumina poly light bricks belong to thermal insulation bricks, and the main components are alumina. Alumina hollow balls have a higher alumina content and are more expensive.

Alumina hollow ball bricks

Alumina hollow ball spheres are made of alumina hollow spheres as the main raw material, high-performance micropowder as an additive, and organic materials as a temporary binder, and are fired in a shuttle kiln. The product contains a large number of closed pores, and has the characteristics of light weight, high temperature resistance, good thermal insulation performance, small reburning shrinkage, and good thermal shock resistance. At the same time, it also has strong corrosion resistance to corrosive gases and slag. The product can greatly improve the thermal efficiency of the kiln, shorten the production cycle, reduce the weight of the kiln body, and achieve energy saving and consumption reduction. The product can directly contact with the flame and is suitable for the lining of cracking furnaces, hot air furnaces, heating furnaces, tunnel kilns, push plate kilns, crucible furnaces and various electric furnaces and electric kilns. It is widely used in metallurgy, refractory materials, light industry, chemical industry, ceramics, electronics and other industries. The product dimensions, physical and chemical indicators, and service life are all at the level of similar products at home and abroad.

High-alumina poly light brick

High-alumina poly light brick is a new type of lightweight refractory brick. It has the characteristics of high temperature resistance, low thermal conductivity, low iron, high pressure resistance, and high thermal stability. It can be directly used for the lining of industrial kilns.

The AL2O3 content in lightweight high-alumina bricks exceeds 60%, the refractory temperature is 1600 degrees, the specific gravity is 0.4-1.35g/cm3, the porosity is 0.66-0.73%, and the compressive strength is 1-8MPA.

Characteristics of lightweight high-alumina bricks:

1. High compressive strength;

2. Good thermal stability;

3. Can reduce the heat energy of the furnace wall;

4. The kiln has high thermal efficiency;

5. It can be processed into various special-shaped products according to the customer's design requirements.

Application of lightweight high-alumina bricks:

It is used for kiln lining (free of solution corrosion) and insulation in metallurgy, machinery, ceramics, chemical industry and other industries. It is an ideal energy-saving product. Use below 1350°C.

High-alumina poly light brick (high-alumina poly light ball brick) is also called high-alumina light insulation brick. Aluminum powder content is greater than 48%, mainly composed of mullite and glass phase or corundum. Lightweight refractory material. Hemoglobin concentration is 0.4~1.35g/cm3. Compressive strength is 66%~73%, and compressive strength is 1~8MPa. It has good thermal shock resistance.

High-alumina poly light bricks are generally made of high-alumina bauxite clinker and a small amount of clay. After grinding, they are cast by gas generation or foam method and fired at 1300~1500℃. Sometimes industrial alumina can also be used to replace part of the bauxite clinker. Lining, insulation layer used in brick kilns, and parts that are not eroded or scoured by strong high-temperature molten materials. At 1350℃, the surface temperature in direct contact with the flame cannot exceed 1350℃.

The difference between insulation bricks and refractory bricks:

The main purpose of insulation bricks is to keep warm and reduce heat loss. For example: lightweight high-alumina bricks. Mullite; while refractory bricks are mainly used to resist fire. Insulation bricks generally do not come into direct contact with flames, while refractory bricks generally come into direct contact with flames. For example, high-alumina bricks and tiles; the main differences are as follows:

1. Thermal insulation performance The thermal conductivity of insulation bricks is usually 0.2-0.4 (average temperature 350±25℃) w/m.k, while the thermal conductivity of refractory bricks is 1.0 (average temperature 350±25℃) w/m.k or more. Therefore, compared with refractory bricks, insulation bricks have better thermal insulation performance;

2. Refractory insulation bricks are generally below 1400 degrees, and refractory bricks are not higher than 1400 degrees;

3. Density Insulation bricks are generally lightweight insulation materials with a density of 0.8-1.0g/cm3, and the density of refractory bricks is generally above 2.0g/cm3.

High-alumina poly light bricks not only play the role of heat insulation, but also play the role of heat preservation and energy saving, reducing energy consumption. Therefore, the development of high-performance thermal insulation materials has become a hot topic in current research. Compared with traditional lightweight refractory bricks, high-alumina poly light bricks have the following advantages:

(1) Low thermal conductivity, especially under high temperature conditions, its thermal conductivity coefficient is relatively low, and it has good thermal insulation and heat insulation performance.

(2) Good thermal shock resistance, the bricks will not deform or fall off within the use temperature range.

(3) According to the purpose of use, choose a reasonable mechanical strength to make the lightweight bricks have excellent performance.

(4) Compared with similar materials, it has a higher softening temperature, a higher reburning change rate, a higher use temperature, a longer life, and is safer.

Differences between alumina hollow ball bricks and high-alumina poly light bricks

1. The content of alumina is different. The AL2O3 content of alumina hollow balls is much higher than that of high-alumina poly light bricks;

2. The production process is different. Hollow ball bricks need to make hollow balls first and then make bricks. Poly light bricks are produced by burning or bubble processes.

3. Hollow balls have a high alumina content, are relatively white, and are more expensive. High-alumina polylight bricks are slightly yellower, and the prices of the two are very cheap.