Chromium corundum refractories generally refer to refractory materials with chromium oxide <40‰ and the remaining component is alumina, which contains a small amount of impurities. It has the characteristics of high refractoriness, high hardness, excellent corrosion resistance, good thermal shock resistance and high wear resistance. Chromium Corundum refractories are widely used in the lining of coal-water slurry pressurized gasification furnaces, ladle refining furnaces and carbon black reactors, slag gasification furnace linings and glass melting furnace linings in the petrochemical industry, and can also be used as heating furnaces The use of chrome corundum platform bricks is an indispensable material for high-temperature industries.
The crystal structure of Cr203 and AL203 are the same, and Cr203 and AL203 can form infinite solid solution at high temperature. From the liquid-solid phase line, as the content of Cr203 increases, the temperature at which the liquid phase begins to appear also rises. Therefore, adding an appropriate amount of Cr203 to AL203 can significantly improve the mechanical properties and high-temperature service performance of corundum-based refractories.
Cr203 can form a high melting point compound or a eutectic with a higher melting temperature with many common oxides. For example, FeO·Cr203 spinel produced by Cr203 and Feo has a melting point as high as 2100℃; Cr203 and AL203 can form a continuous solid solution. In addition, Cr203 can also greatly increase the viscosity of the slag and reduce the fluidity of the slag, thereby reducing the corrosion of the slag to the refractory. Therefore, adding an appropriate amount of Cr203 to the refractory material can significantly reduce the structural spalling of the furnace lining material caused by the corrosion of the furnace slag. There is no obvious regularity between the corrosion ability of slag to chromium corundum refractories and slag basicity; when the slag basicity is 2, the chromium corundum brick has the best resistance to iron slag erosion; when the slag basicity is 0.2, copper The slag has the smallest corrosion depth to the chrome corundum brick; when the slag alkalinity is 0.35, the tin slag has the smallest corrosion depth to the chrome corundum brick; when the lead slag alkalinity is 0.3, the thickness of the residue is the largest and the depth of the reaction layer, the erosion layer and the penetration layer The smallest. When the slag alkalinity is 0.37, the corrosion resistance of chrome corundum bricks is the best. At 1400℃, the corrosion resistance of chrome corundum bricks against non-ferrous metal slag is: nickel slag> lead slag> copper slag> tin slag
Wechat Us 
