Electro-fused corundum with aluminum-chromium slag as main material and preparation method thereof

Abstract

The invention relates to electro-fused corundum with an aluminum-chromium slag as a main material and a preparation method thereof. The technical scheme is as follows: the chemical composition of theelectro-fused corundum with the aluminum-chromium slag as the main material comprises: 65-73 wt% of aluminum-chromium slag particles; 4-8 wt% of a carbonaceous raw material; 8-16 wt% of an industrialalumina fine powder, 8-13 wt% of a high bauxite fine powder; and 1-5 wt% of an aluminum fluoride fine powder. According to the chemical composition, the aluminum-chromium slag particles and the carbonaceous raw material are first uniformly mixed and added into an electric arc furnace, and the heat preservation is carried out for 3-6 h at 2000-2200 DEG C; and then the industrial alumina fine powder, the high bauxite fine powder and the aluminum fluoride fine powder are added to the electric arc furnace, the heat preservation is carried out for 4-7 h at 2000-2200 DEG C, and the natural cooling is carried out to obtain the electro-fused corundum with the aluminum-chromium slag as the main material. The method has the characteristics of being capable of consuming a large amount of the aluminum-chromium slag, alleviating the environmental hazard of the aluminum-chromium slag, low cost and environmental friendliness, and the prepared electro-fused corundum with the aluminum-chromium slag asthe main material has good density.

Description

technical field [0001] The invention belongs to the technical field of preparation of electric fused corundum. In particular, it relates to an electric fused corundum with aluminum chromium slag as the main material and a preparation method thereof. Background technique [0002] Aluminum chromium slag is a by-product derived from the smelting of metallic chromium by the aluminothermic reduction reaction. When metal chromium is smelted, the reduction reaction between metal aluminum and industrial chromium oxide is used to produce metal chromium, metal aluminum powder and Cr 2 o 3 A violent chemical reaction occurs in the molten state, and the generated Al 2 o 3 Rapidly transforms to corundum phase, and at the same time reacts with unreacted Cr 2 o 3 solid solution to generate aluminum-chromium solid solution, that is, aluminum-chromium slag. As a solid waste, aluminum chromium slag will pollute the environment, especially the hexavalent chromium in it will seriously en...

AI Technical Summary

Problems solved by technology

As a solid waste, aluminum chromium slag will pollute the environment, especially the hexavalent chromium in it will seriously endanger the environment and human health; while aluminum chromium slag is directly added to chromium-containing refractory products for use, but there are still environmental hazards. Contaminating hexavalent chromium compounds

[0003] In order to reduce the content of hexavalent chromium compounds and impurity components in aluminum chromium slag, the patented technology of "a chromium corundum material and its production method" (CN103896609A) is patented. This technology presses aluminum chromium slag, petroleum coke and other materials into balls, and dries them After adding into the electric arc furnace, the chromium corundum material is obtained, but the above method fails to completely separate the chromium elements, and there is still a potential hazard of hexavalent chromium pollution.

In order to completely separate chromium elements, the patented technology of "a fused corundum material and its production method" (CN104788112A) also uses aluminum chromium slag as raw material, and uses petroleum coke as a reducing agent to smelt fused corundum in an electric arc furnace. This method completely uses aluminum chromium slag as the main raw material. The aluminum chromium slag contains high CaO, which cannot be completely removed during the smelting process. There is a high CaO component in the produced fused corundum, which affects the performance of its fused corundum.

[0004] The preparation of fused corundum generally uses industrial alumina, homogenized bauxite and high-alumina bauxite as aluminum sources, such as the patent "Smelting process of brown corundum" (CN102815731A) and the patent "High-density white corundum and its preparation process" ( CN102674870A), etc., but due to the gradual tension of my country's resources, not only the cost is high, but also a large amount of consumption of the above-mentioned resources is not conducive to the sustainable development of industry