Hubei Zhongnai New Material Technology Co., Ltd.

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Alumina hollow ball bricks

The anti-spalling alumina hollow ball products produced by our company are made of alumina hollow ball as the main raw material, high performance micro-powder as the additives, organic materials as the temporary bonding agent, and fired at high temperature in the shuttle kiln. Products containing a large number of closed pores, with light weight and high temperature resistance, good thermal insulation, re-firing shrinkage is small, excellent thermal shock resistance, etc., on the erosive gases and slag also has a strong resistance. The products can greatly improve the thermal efficiency of the kiln, shorten the production cycle, reduce the weight of the kiln and realize energy saving. The products can be directly contacted with the flame, and are suitable for the lining of cracking furnace, hot air furnace, heating furnace, tunnel kiln, pusher kiln, crucible furnace and all kinds of electric furnaces and kilns, and are widely used in metallurgy, refractory materials, light industry, chemical industry, ceramics, glass, electronics and other industries. The external dimensions, physical and chemical indexes and service life of the products have reached or exceeded the level of similar products at home and abroad.

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Refractory materials for cement industry

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Item	Alumina hollow ball bricks			Zirconia Hollow Ball Brick
model number	85 bricks	90 bricks	99 Brick	98 bricks
Maximum operating temperature ℃	1680	1700	1800	2200
Al2O3 %	≥85	≥90	≥99
ZrO2 %				≥98 (with stabilizer)
SiO2 %	≤15	≤8	≤0.2	≤0.2
Fe2O3 %	≤0.2	≤0.2	≤0.2	≤0.2
bulk density g/cm3	1.4-1.7	1.4-1.7	1.4-1.7	≤3.0
Normal temperature compressive strength MPa	≥12	≥10	≥9	≥8
Starting temperature of load softening ℃	≥1650	≥1760	≥1760	≥2200
(0.1MPa,0.6%)	≥1650	≥1760	≥1760	≥2200
Rate of change of the refiring line %	±0.3	±0.3	±0.3	±0.2
(1600℃×3h)	±0.3	±0.3	±0.3	±0.2
Coefficient of thermal expansion × 10-6	～7.8	～8.0	～8.6	～9.1
(room temperature - 1300°C)	～7.8	～8.0	～8.6	～9.1
Thermal conductivity w/(m.k)	≤0.8	≤1.3	≤1.5	≤0.3
(average temperature 800°C)	≤0.8	≤1.3	≤1.5	≤0.3