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Smelting method for metal chromium with low aluminum content

A smelting method and aluminum content technology, applied in the field of chromium metal smelting with low aluminum content, can solve the problems of high equipment pressure, long treatment process, large investment, etc., and achieve the effect of improving recovery rate and reducing pollution

Active Publication Date: 2018-03-09
锦州市金属材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment process of this method is long, the equipment pressure required for acid hydrolysis is high, and the investment is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Mix 12kg of chromium trioxide for metallurgy, 0.5kg of calcium oxide, 80kg of aluminum oxide, and 3kg of sodium oxide with a mixer for 15 minutes; get mixture 1;

[0027] 2. 100 kg of chromium trioxide with a purity of >99.0%, an average particle size of 1-40 mm, and 23 kg of carbon with a sulfur content of <0.01%, and an average particle size of 5-30 mm, were mixed with a mixer for 10 minutes to obtain a mixture Material 2;

[0028] 3. Put the mixture 1 into the electric furnace and melt it completely with high voltage, then add the mixture 2, and the smelting temperature of the electric furnace is higher than 1750°C so that all the added materials will be melted;

[0029] 4. Naturally lower the temperature until the temperature is lower than 100°C, then release from the furnace, remove the slag on the surface to obtain metal chromium blocks, break and pack, and obtain commercial metal chromium.

Embodiment 2

[0031] 1. 18 kg of chromium trioxide for metallurgy, 0.45 kg of calcium oxide, 78.5 kg of magnesium oxide, and 2 kg of sodium oxide were mixed for 15 minutes with a mixer; mixture 1 was obtained;

[0032] 2. 100kg of chromium trioxide with a purity of >99.0% and an average particle size of 5-40 mm and 23 kg of carbon with a sulfur content of <0.01% and an average particle size of 5-30 mm were mixed with a mixer for 10 minutes to obtain a mixture Material 2;

[0033] 3. Put the mixture 1 into the electric furnace and melt it completely with high voltage, then gradually add the mixture 2, the smelting temperature of the electric furnace is higher than 1750 ℃, so that all the added materials are cleared;

[0034] 4. Naturally lower the temperature until the temperature is lower than 100°C, then release from the furnace, remove the slag on the surface to obtain metal chromium blocks, break and pack, and obtain commercial metal chromium.

Embodiment 3

[0036] 1. 10kg of chromium trioxide for metallurgy, 0.4kg of calcium oxide, 85kg of aluminum oxide, and 4kg of magnesium oxide were mixed for 15 minutes with a mixer; to obtain mixture 1;

[0037] 2. 100kg of chromium trioxide with a purity of >99.0% and an average particle size of 20-40 mm and 23 kg of carbon with a sulfur content of <0.01% and an average particle size of 5-30 mm were mixed with a mixer for 10 minutes to obtain a mixture Material 2;

[0038] 3. Put the mixture 1 into the electric furnace and melt it completely with high voltage, then add the mixture 2, and the smelting temperature of the electric furnace is higher than 1750°C so that all the added materials will be melted;

[0039] 4. Naturally lower the temperature until the temperature is lower than 100°C, then release from the furnace, remove the slag on the surface to obtain metal chromium blocks, break and pack, and obtain commercial metal chromium.

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PUM

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Abstract

The invention provides a smelting method for metal chromium with low aluminum content. The smelting method comprises the following steps: mixing industrial dichromium trioxide, calcium oxide, aluminumoxide or magnesium oxide and sodium oxide according to the mass ratio of (1 to 5) to (0.01 to 0.1) to (6 to 9) to (0.01 to 0.4) by utilizing a mixer, so as to obtain a mixture A; mixing the industrial dichromium trioxide and carbon according to the mass ratio of 1 to (0.1 to 0.5) by utilizing the mixture, so as to obtain a mixture B; putting the mixture A into an electric furnace; adding the mixture B after the mixture A is completely melted; raising the smelting temperature of the electric furnace to be higher than 1750 DEG C, so as to completely melt the added materials; naturally cooling until the temperature is less than 100 DEG C and then discharging the materials out from the furnace; cleaning dreg on the surfaces to obtain a metal chromium block; and after crushing, packaging to obtain commodity metal chromium. The method provided by the invention has the advantages of low energy consumption and high product purity.

Description

technical field [0001] The invention relates to the field of chromium metal smelting, in particular to a chromium metal smelting method with low aluminum content. Background technique [0002] Metal chromium is usually used to smelt superalloys, resistance alloys, precision alloys and other non-ferrous alloys. With the advancement of science and technology at home and abroad, the role of high-quality metal chromium is becoming more and more important. The production methods of metal chromium include electric silicon thermal method, aluminum thermal method, electrolytic method, etc. The electric silicon thermal method has already been eliminated because the silicon content in the alloy is more than 2%. By the late 1960s, as the importance of pure chromium continued to increase, efforts to produce metallic chromium by electrolysis intensified. The thermite method uses chromium trioxide as raw material and aluminum powder as reducing agent to produce metallic chromium. Becau...

Claims

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Application Information

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IPC IPC(8): C22B34/32C22B5/10C22B5/04
CPCC22B5/04C22B5/10C22B34/32
Inventor 王景军王明秋
Owner 锦州市金属材料研究所
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