Alumina Hollow Ball Bricks

Alumina hollow ball bricks is made of alumina hollow balls as the main raw material, high-performance micropowder as the additive, and organic material as the temporary binder, which is fired at high temperature in a shuttle kiln. The product contains a large number of closed pores, has the characteristics of light weight, high temperature resistance, good insulation performance, small shrinkage after re-burning, and excellent thermal shock resistance. It also has strong resistance to corrosive gases and slag.

Alumina bubble Bricks are not born from ordinary manufacturing methods. The process involves precision engineering-blending high-purity alumina, shaping it into hollow spherical forms, and subjecting it to high-temperature firing. this brick that is not just solid, but a series of interconnected hollow spheres. This design is the key. These bricks boast unparalleled thermal insulation, reducing heat transfer significantly. The honeycomb structure creates pockets of air within the bricks, minimizing thermal conductivity without compromising on strength.

Alumina hollow ball bricks have the characteristics of light weight, high temperature resistance, good thermal insulation performance, small shrinkage after re-fire, excellent thermal shock resistance, etc., and also have strong resistance to corrosive gases and slag. The products can greatly improve the thermal efficiency of the kiln, shorten the production cycle, reduce the weight of the kiln body, and realize energy saving and consumption reduction.

Alumina hollow ball bricks obvious effects will be achieved for reducing the weight of the furnace body, transforming the structure, saving materials, and saving energy.
1. High operating temperature:
It can reach above 1750 degrees, with good thermal stability. The reheating 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:
The bulk density of heavy bricks currently used with high temperature resistant materials is 2.6-3.0g/cm3, while alumina bubble insulation bricks are only 1.3~1.5g/cm3.

3. Save materials:
To reach the same operating temperature, the price of heavy bricks is equivalent to that of alumina bubble insulation bricks, and considerable refractory materials are required for insulation. If alumina bubble firebricks 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. Save energy:
Alumina hollow spheres have obvious thermal insulation properties and low thermal conductivity, which can achieve a good thermal insulation effect, reduce heat dissipation, improve thermal efficiency, and save energy. The energy saving effect can reach more than 30%.

Manufacture of alumina hollow ball bricks The alumina hollow ball, sintered alumina fine powder and binder are mixed in a certain proportion, formed, dried, and fired to prepare bricks.
Alumina fine powder is made from industrial alumina as raw material, calcined at 1500°C, then ground, pickled and dried.The bonding agent used in making bricks is usually aluminum sulfate aqueous solution or aluminum dihydrogen phosphate aqueous solution.

Alumina hollow spheres generally have a particle size of 5 to 0.5 mm, the amount is 65% to 70%, the amount of fine alumina powder is 30% to 35%, and the amount of binder is 5%.
Mix the above-mentioned materials uniformly and form them by vibration molding method. After the bricks are dried, they are fired at 1500 to 1800°C to make fired bricks; they can also be made without firing to make unfired products, or the furnace lining can be directly constructed with unshaped materials.

Alumina hollow ball bricks are mainly used as the lining of high-temperature industrial kilns below 1800℃, such as high-temperature kiln lining bricks in the refractory, electronics, and ceramic industries; thermal insulation for high-temperature thermal equipment, such as the petrochemical industry Insulation bricks for gasifiers, gas generators, carbon black industrial reactors, and induction furnaces in the metallurgical industry. Application in the above-mentioned fields can save energy by 20% to 30%. This kind of brick is used as the lining of high-temperature kiln, the heating speed should not be too fast during baking, otherwise it will produce cracks, reduce the strength and service life; because of its high apparent porosity, it can not be used in the parts contacting the slag, otherwise it will Damaged by slag penetration.

Alumina bubble bricks can be used for high-temperature energy-saving inverted flame kilns, shuttle kilns, molybdenum wire furnaces, tungsten rod furnaces, induction furnaces, nitriding furnaces, etc. Obvious effects will be achieved for reducing the weight of the furnace body, transforming the structure, saving materials, and saving energy.

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