Magnesium oxide-forsterite-carbon composite material for lower part of copper smelting converter and its preparation method

Abstract

The invention relates to a magnesium oxide-forsterite-carbon composite material used at the lower part of a copper smelting converter and a preparation method thereof. The magnesium oxide-forsterite-carbon composite material is characterized in that firstly, 35 to 55 weight percent of fused magnesite particles, 10 to 30 weight percent of forsterite particles, 6 to 16 weight percent of caustic calcined magnesite fine powder, 5 to 15 weight percent of pyrophyllite fine powder, 3 to 7 weight percent of amorphous graphite micro powder, 3 to 7 weight percent of Si2N2O / SiC / TiC / TiCN / C composite powder, 1 to 3 weight percent of monatomic silicon fine powder, 2 to 5 weight percent of titanium aluminum carbide fine powder and 2 to 5 weight percent of manganous oxide fine powder are used as raw materials; then, raw materials of 2 to 5 weight percent of zirconium oxide sol and 3 to 5 weight percent of cobalt modified phenolic resin are added; uniform stirring, formation and drying are performed; heat insulation is performed for 2 to 8h under the conditions of buried carbon atmosphere and 1200 to 1400 DEG C; the magnesium oxide-forsterite-carbon composite material used at the lower part of thecopper smelting converter is obtained. The product of the magnesium oxide-forsterite-carbon composite material has the characteristics of environment-friendly effect, high microporosity, good thermalshock resistant performance and excellent matte-molten slag permeation erosion resistant performance.

Description

technical field [0001] The invention belongs to the field of carbon-containing refractories for copper smelting converters. In particular, it relates to a magnesium oxide-forsterite-carbon composite material for the lower part of a copper smelting converter and a preparation method thereof. Background technique [0002] The copper smelting converter is an important smelting equipment in the matte blowing process. During the blowing process, air is blown into the matte in the converter, FeS is preferentially oxidized to FeO and reacts with the added quartz to enter the slag; then Cu 2 S is oxidized to desulfurize, and crude oil with a content of more than 98% is obtained. [0003] At present, magnesia-chrome bricks are generally used as lining materials for copper smelting converters. Although the solubility of the bricks in slag is low, magnesia-chrome bricks are difficult to sinter, have a loose structure, high apparent porosity and large pore size. In the lower part of ...

AI Technical Summary

Problems solved by technology

Because the structure and performance of the metamorphic layer are quite different from the original brick layer, part of the refractory material is separated from the brick body, resulting in peeling off, resulting in serious damage to the magnesia-chrome brick used in the lower part of the copper smelting converter

[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.