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Method for efficiently recovering copper and tungsten from copper and tungsten alloy waste

A technology of copper-tungsten alloy and copper recovery, which is applied in the direction of improving process efficiency, etc., can solve the problems of difficult to handle nitrogen oxides and low efficiency, and achieve significant economic benefits, simple process route, and good separation effect

Active Publication Date: 2020-04-21
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, sulfuric acid dissolution still has the problem of low efficiency, while nitric acid dissolution, although the reaction is fast and the efficiency is relatively improved, but there is the problem that nitrogen oxides are difficult to handle

Method used

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  • Method for efficiently recovering copper and tungsten from copper and tungsten alloy waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 1000g copper-tungsten alloy, containing 22% copper, 68% tungsten, and 10% carbon, crush the alloy, mix it with 136g sodium hydroxide, 680g sodium carbonate, and 6.8g borax, add a small amount of water, heat up to 300°C, and dissolve the material In a molten state, slowly drop 680g of hydrogen peroxide. After the reaction is complete, the material solidifies. Add an appropriate amount of hot water to dissolve the material, and separate the solid and liquid through vacuum filtration. The sodium tungstate solution was refined, concentrated and crystallized to obtain 1208g of qualified sodium tungstate product, the recovery rate was 99%, and the tested purity was 99.1%. Copper oxide was reduced by passing hydrogen gas to obtain 218.5 g of copper powder with a recovery rate of 99.3% and a purity of 99.2% after testing.

Embodiment 2

[0025] Take 5000g of copper-tungsten alloy, containing 30% copper, 65% tungsten, and 5% carbon, crush the alloy, mix it with 650g sodium hydroxide, 3250g sodium carbonate, and 32g borax, add a small amount of water, heat up to 400°C, and the material dissolves into a In the molten state, slowly drop 4000g of hydrogen peroxide. After the reaction is completed, the material solidifies, and an appropriate amount of hot water is added to dissolve the material, and the solid and liquid are separated by vacuum filtration. The sodium tungstate solution was refined, concentrated and crystallized to obtain 5810g ​​of qualified sodium tungstate product, the recovery rate was 99.6%, and the tested purity was 99.2%. Copper oxide was reduced by passing hydrogen gas to obtain 1488g of copper powder, the recovery rate was 99.2%, and the purity was 99.5% after testing.

Embodiment 3

[0027] Take 10,000g copper-tungsten alloy, containing 40% copper, 52% tungsten, and 8% carbon, crush the alloy, mix evenly with 1040g sodium hydroxide, 5200g sodium carbonate, and 52g borax, add a small amount of water, heat up to 500°C, and the material dissolves into a In the molten state, slowly drop 9000g of hydrogen peroxide. After the reaction is complete, the material solidifies. Add an appropriate amount of hot water to dissolve the material, and separate the solid and liquid through vacuum filtration. The sodium tungstate solution was refined, concentrated and crystallized to obtain 9274g of qualified sodium tungstate product, the recovery rate was 99.4%, and the tested purity was 99.5%. Copper oxide was reduced by passing hydrogen gas to obtain 3980 g of copper powder, the recovery rate was 99.5%, and the purity was 99.6% after testing.

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Abstract

The invention belongs to the field of non-ferrous metal hydrometallurgy, and particularly relates to a method for efficiently recovering copper and tungsten from copper-tungsten alloy waste. The method comprises the following steps that the copper-tungsten alloy waste is crushed, mixed evenly with sodium hydroxide, sodium carbonate and borax, a small amount of water is further added, and the temperature is raised to 300-500 DEG C, so that the sodium hydroxide is in a molten state, hydrogen peroxide is dropped slowly, after the reaction is complete, a material is solidified, a proper amount ofhot water is added to dissolve the material, solid and liquid are separated, tungsten enters a liquid phase in the form of sodium tungstate, and copper remains in a solid phase in the form of the copper and copper oxide. Qualified sodium tungstate products are obtained by concentrated crystallization of the sodium tungstate, and the copper oxide is reduced by hydrogen to obtain copper powder. Thetechnical process is simple, the treatment cost is low, the recovery rate is high, and the copper-tungsten recovery rate is greater than 99%.

Description

technical field [0001] The invention belongs to the field of nonferrous metal hydrometallurgy, and specifically refers to a method for efficiently recovering copper and tungsten in copper and tungsten alloy waste. Background technique [0002] Copper-tungsten alloy combines the advantages of metal tungsten and copper, among which tungsten has high melting point and high density; copper has excellent electrical and thermal conductivity, copper-tungsten alloy has uniform microstructure, high temperature resistance, high strength, arc ablation resistance, and high density; electrical conductivity and thermal conductivity Moderate performance, widely used in military high-temperature resistant materials, high-voltage switch electrical alloys, electrical processing electrodes, microelectronic materials, as parts and components widely used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment, etc. industry. The amount of copper-tungsten all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B34/36
CPCC22B7/006C22B15/0063C22B34/36Y02P10/20
Inventor 代林涛周克武林应涛黄庆忠王达武陈松扬刘康宁
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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