Unburned magnesium-aluminum spinel brick

Abstract

The invention discloses an unburned magnesium-aluminum spinel brick, which comprises the following components by mass: 50-80% of corundum, 5-30% of magnesia-alumina spinels, 2-5% of magnesia powder, 3-10% of alumina powder, and the balance at least one of elemental silicon powder, metallic aluminum powder and boron carbide powder. All the components of the unburned magnesium-aluminum spinel brick are combined through an additionally added binder. The unburned magnesium-aluminum spinel brick causes no pollution to the environment, has excellent molten steel erosion resistance, slag penetration resistance and scouring resistance, and has a long service life additionally.

Description

technical field [0001] The invention relates to a refractory material, in particular to a non-burning chromium-free refractory material for a refining RH furnace. Background technique [0002] In the iron and steel industry, the lining of the RH refining furnace has always been made of basic refractory materials containing chromium, and good results have been achieved. [0003] However, under high temperature and alkaline use environment, Cr 2 o 3 The refractory materials in the oxidizing atmosphere and strong basic oxides such as Na 2 O, K 2 In the presence of O or CaO, trivalent chromium Cr 3+ Can be transformed into hexavalent chromium Cr 6+ . Cr 6+ Is a carcinogen, harmful to the human body and easily soluble in water, while Cr 2 o 3 It can exist in the gaseous phase, and will be discharged into the atmosphere with the flue gas during the production process to pollute the air. Furthermore, since K 2 CrO 4 , CaCrO 4 It is easily soluble in water, so the Cr in...

AI Technical Summary

Problems solved by technology

Furthermore, since K 2 CrO 4 , CaCrO 4 It is easily soluble in water, so the Cr in the residual brick after use 6+ It tends to dissolve in rainwater and seep into the ground, causing water pollution