Rongsheng’ s Calcinated alumina is usually made of industrial aluminum hydroxide or industrial alumina as raw materials, calcined at a high temperature above 1300℃, and the resulting α-type alumina powder is also called calcined alumina powder. Calcinated alumina has high hardness, high density, small specific surface area, and excellent high temperature resistance, wear resistance, corrosion resistance and other properties.
1. Iron and steel metallurgy: protecting the purity of molten steel
Ladle air brick: using 75% calcined alumina + 25% chrome corundum formula, air permeability life> 150 furnaces;
Tundish slag retaining wall: multi-layer gradient structure design, Al₂O₃ content increased from 70% to 95%;
Typical case: After Baosteel’s 310-ton converter was applied, the furnace life increased from 8,000 furnaces to 12,000 furnaces;
2. Cement industry: the ultimate solution to resist alkali erosion
Rotary kiln transition zone: developing mullite-corundum composite materials, and the resistance to K₂O erosion increased by 3 times;
Third air duct lining: nano-scale calcined alumina coating, wear resistance index reached 12.5cm³/500r;
3. Nonferrous metallurgy: Survival test under extreme conditions
Aluminum electrolytic cell lining: SiC-Al₂O₃ composite material is used to increase current efficiency to 94%;
Copper flash smelting furnace: Development of ZrO₂-Al₂O₃ gradient refractory bricks, with a service life of more than 18 months;
4. Technological breakthroughs in emerging fields
Garbage incinerator: Introduction of Cr₂O₃-Al₂O₃ solid solution, HCl corrosion rate reduced to 0.03mm/d;
Hydrogen energy equipment: Development of porous Al₂O₃ carrier to withstand 1000℃ hydrogen embrittlement environment;
