Magnesium oxide-silicon carbide composite material for upper part of copper smelting converter and its preparation method

Abstract

The invention relates to a magnesium oxide-silicon carbide composite for the upper part of a copper smelting converter and a preparation method of the composite. The technical scheme is as follows: firstly, 40wt%-60wt% of fused magnesia particles, 5wt%-25wt% of silicon carbide particles, 6wt%-16wt% of sintered magnesia fine powder, 5wt%-15wt% of zircon fine powder, 4wt%-8wt% of raw alumina micro powder, 3wt%-7wt% of titanium oxide fine powder, 1wt%-3wt% of monatomic silicon fine powder and 2wt%-5wt% of nickel oxide fine powder are taken as raw materials, 6wt%-10wt% of zirconium oxide sol and 1wt%-3wt% of cerium oxide micro powder are added, uniform mixing, forming and drying are performed, the obtained mixture is kept at the constant temperature of 1,250-1,450 DEG C in a carbon embedded atmosphere for 2-8 h, then impregnated in a zirconium oxychloride solution for 0.5-3 h and kept at the constant temperature of 600-900 DEG C for 2-6 h, and the magnesium oxide-silicon carbide compositefor the upper part of the copper smelting converter is obtained. The produced product has the characteristics of environmental friendliness, low apparent porosity, high anti-stripping capacity and excellent residue permeation corrosion resistance.

Description

Technical field [0001] The invention belongs to the field of refractory materials for copper smelting converters. Specifically, it relates to a magnesium oxide-silicon carbide composite material for the upper part of a copper smelting converter and a preparation method thereof. Background technique [0002] Copper smelting converter is an important smelting equipment in the matte converting process. During the blowing process, air is blown into the copper matte in the converter, and FeS is preferentially oxidized to FeO and reacts with the added quartz to enter the slag; then Cu 2 S is desulfurized by oxidation to obtain a crude pass with a content of 98% or more. Therefore, the use environment of the lining material of the copper smelting converter is very harsh and needs to withstand high temperature, erosion, acid slag erosion and sharp temperature fluctuations. [0003] At present, magnesia-chrome bricks are commonly used as lining materials for copper smelting converters. Al...

AI Technical Summary

Problems solved by technology

Because the structure and properties of the metamorphic layer are quite different from those of the original brick layer, repeated fluctuations in the upper furnace temperature of the copper smelting converter will cause part of the refractory material to separate from the brick body, resulting in peeling off; in addition, the acid gas on the upper part of the furnace lining chemically corrodes the material, resulting in smelting The magnesia-chrome brick used for the upper part of the copper converter was severely damaged

[0004] In addition, chromium ions in magnesia-chrome bricks may produce hexavalent chromium, which is highly carcinogenic, during use and stacking after use. Extensive use of magnesia-chrome bricks is bound to seriously pollute the environment and threaten the health of humans and animals.