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A method for smelting metal chromium with aluminum chromium slag in electric arc furnace

A technology of aluminum chromium slag and electric arc furnace, which is applied in the field of metal material smelting, can solve the problems of aluminum chromium slag discharge and other problems, achieve the effect of low cost, reasonable process, and solve the problem of chromium slag discharge

Active Publication Date: 2017-06-16
锦州集信高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for smelting metal chromium by using aluminum chromium slag in an electric furnace through a two-step method of reduction first and then oxidation and carbon removal. The aluminum chromium slag is used as raw material to produce metal chromium, which has low cost and solves the problem of aluminum chromium slag discharge , to achieve resource reuse, reasonable process, high product purity, good performance, suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Raw materials and processing

[0029] Cr 2 o 3 Aluminum chromium slag block material with a mass percentage of 10%, the aluminum chromium slag block material is crushed to a particle size of less than 10 mm;

[0030] Take aluminum particles with a mass percentage content of Al ≥ 99%, and the particle size is less than 10mm;

[0031] Take petroleum coke with a C content of 98% by mass and an ash content of ≤0.5% by mass, and pulverize it until the particle size is less than 10mm;

[0032] Take oxygen and argon, the purity of oxygen is ≥99.5%, and the purity of argon is ≥99.9%;

[0033] Take the smelting solvent calcium oxide, the activity of the calcium oxide is CaO≥300, and the total mass content of iron oxide and silicon dioxide in the calcium oxide is ≤0.3%;

[0034] Take slagging agent calcium fluoride, CaF in calcium fluoride 2 The mass percentage content of iron oxide and silicon dioxide is ≥90%, the total mass content of iron oxide and silicon dioxide is ≤...

Embodiment 2

[0043] a. Raw materials and processing

[0044] Cr 2 o 3 Aluminum chromium slag block material with a mass percentage of 10%, the aluminum chromium slag block material is crushed to a particle size of less than 10mm;

[0045] Take aluminum particles with a mass percentage content of Al ≥ 99%, and the particle size is less than 10mm;

[0046] Take petroleum coke with a C content of 98% by mass and an ash content of ≤0.5% by mass, and pulverize it until the particle size is less than 10mm;

[0047] Take oxygen and argon, the purity of oxygen is ≥99.5%, and the purity of argon is ≥99.9%;

[0048] Take the smelting solvent calcium oxide, the activity of the calcium oxide is CaO≥300, and the total mass content of iron oxide and silicon dioxide in the calcium oxide is ≤0.3%;

[0049] Take slagging agent calcium fluoride, CaF in calcium fluoride 2 The mass percentage content of iron oxide and silicon dioxide is ≥90%, the total mass content of iron oxide and silicon dioxide is ≤0...

Embodiment 3

[0058] a. Raw materials and processing

[0059] Cr 2 o 3 Aluminum chromium slag block material with a mass percentage of 10%, the aluminum chromium slag block material is crushed to a particle size of less than 10mm;

[0060] Take aluminum particles with a mass percentage content of Al ≥ 99%, and the particle size is less than 10mm;

[0061] Take petroleum coke with a C content of 98% by mass and an ash content of ≤0.5% by mass, and pulverize it until the particle size is less than 10mm;

[0062] Take oxygen and argon, the purity of oxygen is ≥99.5%, and the purity of argon is ≥99.9%;

[0063] Take the smelting solvent calcium oxide, the activity of the calcium oxide is CaO≥300, and the total mass content of iron oxide and silicon dioxide in the calcium oxide is ≤0.3%;

[0064] Take slagging agent calcium fluoride, CaF in calcium fluoride 2 The mass percentage content of iron oxide and silicon dioxide is ≥90%, the total mass content of iron oxide and silicon dioxide is ≤0...

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Abstract

The invention discloses a method for smelting chromium metal from aluminum-chromium slag in an electric arc furnace. Aluminum-chromium slag with the granularity lower than 10 mm and petroleum coke with the granularity lower than 10 mm are mixed evenly and fed into a drying kiln to be dried till the water content is smaller than or equal to 0.5%, the mixture is added in the three-phase electric arc furnace to be smelted, and high-temperature smelting is conducted; liquid chromium carbide at the bottom of a hearth of the electric arc furnace is transferred into a plasma electric arc furnace, the hearth of the plasma electric arc furnace is inflated with oxygen, and calcium oxide and slagging constituent calcium fluoride are added; and after high-temperature smelting, the plasma electric arc furnace is inflated with argon serving as protective gas, aluminum particles are added for continuous smelting, qualified liquid chromium metal is obtained and poured in a sand shell die to be naturally cooled, impurities on the surface are removed, crushing is conducted, and chromium metal is obtained. Aluminum-chromium slag serves as raw materials for producing chromium metal, chromium metal is smelted through a two-step method that reduction is conducted firstly and then carbon removing is conducted through oxidation, cost is low, and the problem of discharging of aluminum-chromium slag is solved. Resource recycling is achieved, the technology is reasonable, the product purity is high, performance is good, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of metal material smelting, and in particular relates to a method for smelting metal chromium from aluminum chromium slag in an electric arc furnace. Background technique [0002] With the country's emphasis on the environment, especially the discharge requirements of the three wastes have become more stringent. The treatment, recycling and reuse of solid waste discharged by enterprises can not only bring huge economic benefits, but also be more environmentally friendly. [0003] Metal chromium products are national strategic products, which are suitable for smelting high-temperature alloys, resistance alloys and precision alloys. [0004] At present, there are only three methods for producing chromium metal. One is the reduction method of chromium oxide and metal aluminum, which is called metal thermal reduction in industry; Mix chromium carbide and chromium oxide to generate powdered metal chromium under vacuum; t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/32C22B7/04
CPCC22B7/001C22B7/04C22B34/32Y02P10/20
Inventor 高红军宋建义曹杨寇志远朱逾倩刘帅杨晓辉黄博田刚高辉
Owner 锦州集信高温材料有限公司