A kind of low-porosity magnesia-chrome brick applied in non-ferrous industry and production method thereof

Abstract

The invention relates to a low-porosity magnesite-chrome brick applied to nonferrous industry and a production method of the low-porosity magnesite-chrome brick. When the magnesite-chrome brick is used, produced hexavalent chromium is less than 50ppm, and the apparent porosity of the magnesite-chrome brick is less than or equal to 12.0. The low-porosity magnesite-chrome brick contains the following raw material components in parts by weight: 1-5 parts of 1mm-3mm 97# high purity magnesia, 5-15 parts of 97# fused magnesia with a particle size less than 0.074mm, 5-15 parts of 1mm-3mm 97# fused magnesia, 20-40 parts of 0-1mm chromium 20# sand, 10-30 parts of 1mm-3mm chromium 20# sand, 10-30 parts of 3mm-5mm chromium 20# sand, 5-20 parts of Pakistan chrome with a particle size less than 0.074mm, 5-20 parts of chromium 20# waste bricks, 1-5 parts of a binding agent, 1-3 parts of Al2O3 micropowder and 1-3 parts of ZrO. The porosity of the magnesite-chrome brick is less than 12%, and the corrosion to a refractory brick is reduced, so that the service life of the refractory brick is prolonged; and the heat conductivity coefficient is reduced, and the temperature is directly reduced, so that the consumption of the energy source is reduced, and the service life of a furnace body is prolonged.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a low-porosity magnesia-chrome brick used in the non-ferrous industry and a production method thereof. Background technique [0002] Magnesia-chrome bricks are inorganic non-metallic materials and basic refractory products. They have excellent properties such as high refractoriness, corrosion resistance and spalling resistance. They are irreplaceable key basic materials for global steel refining and non-ferrous metallurgy. The main equipment of the new process applied in the non-ferrous industry includes oxygen bottom-blowing smelting furnace, multi-component oxygen lance with casing structure, lead oxide slag casting machine, waste heat boiler with vertical rising section of membrane wall, blast furnace with new structure, etc. The core equipment of the new process is the oxygen bottom blowing smelting furnace. Oxygen bottom blowing smelting-blast furnace reduction lead smel...

AI Technical Summary

Problems solved by technology

[0004] However, the apparent porosity of the currently produced magnesia-chrome bricks is higher than 12%, which will cause the slag to enter the cracks, voids, and matrix of the refractory bricks during use, thereby affecting the service life of the bricks and reducing the performance of the kiln.

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