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Alumina hollow ball bricks


Alumina hollow ball bricks are made of alumina hollow balls and alumina powder as the main raw materials, combined with other binders, and fired at a high temperature of 1750 degrees. It belongs to a kind of ultra-high temperature material energy-saving thermal insulation material.

Alumina hollow sphere is a new type of high-temperature thermal insulation material, which is smelted and blown with industrial alumina in an electric furnace, and its crystal form is a-Al2O3 microcrystal. With alumina hollow spheres as the main body, it can be made into products of various shapes. The maximum operating temperature is 1800 ° C. The mechanical strength of the products is high, which is several times that of ordinary lightweight products, and the bulk density is only one-half of the corundum products. It has been widely used in high temperature and ultra-high temperature furnaces such as petrochemical industrial gasifiers, carbon black industrial reaction furnaces, metallurgical industrial induction furnaces, etc., and has achieved very satisfactory energy-saving effects.

For reducing the weight of the furnace body, transforming the structure, saving materials and saving energy, obvious effects will be achieved.

1. High operating temperature:

It can reach more than 1750 degrees and has good thermal stability. The reburning line has a small change rate and can be used for a longer time.

2. Optimize the structure and reduce the weight of the furnace body:

Now the high temperature resistant materials are all heavy bricks with a bulk density of 2.6-3.0g/cm, while the alumina hollow ball bricks are only 1.1~1.5g/cm, the same volume of one cubic meter, the use of alumina hollow ball bricks can reduce 1.1- 1.9 ton weight.

3. Material saving:

To achieve the same service temperature, such as the use of heavy bricks, the price is comparable to that of alumina hollow ball bricks, and considerable insulation refractory materials are required. If alumina hollow ball bricks are used, 1.1-1.9 tons of heavy bricks can be saved per cubic meter, and 80% of refractory insulation materials can be saved.

4. Energy saving:

Alumina hollow spheres have obvious thermal insulation properties and low thermal conductivity, which can play a good thermal insulation effect, reduce heat dissipation, and improve thermal efficiency, thereby saving energy. The energy saving effect can reach more than 30%.

Alumina hollow spheres and their products are lightweight refractory materials with high temperature resistance and excellent energy saving, which are very stable in various atmospheres. Especially in the high temperature furnace of 1800 ℃. Hollow spheres can be used as high temperature and ultra-high temperature insulation fillers, high temperature refractory concrete lightweight aggregates, high temperature castables, etc. Hollow spherical bricks can be used for high temperature energy saving (>30%) down-flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc. For reducing the weight of the furnace body, transforming the structure, saving materials and saving energy, obvious effects will be achieved.

α-alumina powder is made of high-quality industrial alumina as raw material, produced by new high-temperature down-flame kiln and scientific calcination process, with manual selection, clear classification, less impurities, high conversion rate, stable shrinkage rate and good consistency .