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Method for recycling cobalt nickel from tungsten waste recycling slag

A tungsten waste, cobalt-nickel technology, applied in the field of cobalt-nickel recycling and reuse, can solve the problems of low leaching rate, long and large leaching time; on the other hand, sodium sulfite and sulfur dioxide will release sulfur dioxide gas during use, etc. Achieve the effect of less consumption of original agent and simple process

Inactive Publication Date: 2019-12-31
XIAMEN TUNGSTEN +1
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  • Claims
  • Application Information

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Problems solved by technology

On the one hand, a large amount of reducing agent is added during the treatment process; on the other hand, sodium sulfite and sulfur dioxide will release sulfur dioxide gas during use, and the leaching time is long and the leaching rate is not high

Method used

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  • Method for recycling cobalt nickel from tungsten waste recycling slag

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Effect test

Embodiment 1

[0032] S1. Mix 2000kg of recycled tungsten waste slag (the mass content of cobalt oxide is 5%, and the mass content of nickel oxide is 2%), and the solid-liquid ratio is 1:3.

[0033] S2, add concentrated sulfuric acid 0.3m to the pulping liquid obtained in step S1 3 , add 60kg of sodium hypophosphite, heat to 60°C, react for 1h, residual acid 10g / l. After the reduction, the liquid-liquid is filtered to remove the waste residue through solid-liquid separation equipment to obtain a cobalt-nickel solution with a cobalt recovery rate of 95.3% and a nickel recovery rate of 95.5%.

Embodiment 2

[0035] S1. Mix 1500kg of tungsten waste recycling slag (the mass content of cobalt oxide is 15%, and the mass content of nickel oxide is 20%), and the solid-liquid ratio is 1:5.

[0036]S2, add concentrated hydrochloric acid 0.8m to the mixing solution obtained in step S1 3 , add 200kg of sodium hypophosphite, heat to 70°C, react for 6h, residual acid 30g / l. After the reduction, the feed liquid is filtered by solid-liquid separation equipment to remove the waste residue, and a cobalt-nickel solution is obtained. The cobalt recovery rate is 96.1%, and the nickel recovery rate is 95.8%.

Embodiment 3

[0038] S1. Mix 1200kg of recycled tungsten waste slag (the mass content of cobalt oxide is 20%, the mass content of nickel oxide is 15%), and the solid-liquid ratio is 1:6.

[0039] S2, add concentrated phosphoric acid 0.5m to the mixing liquid obtained in step S1 3 , add 600Kg of sodium hypophosphite, heat to 80°C, react for 12h, residual acid 60g / l. After the reduction, the waste residue is filtered out by solid-liquid separation equipment to obtain a cobalt-nickel solution with a cobalt recovery rate of 95.1% and a nickel recovery rate of 96.1%.

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Abstract

The invention discloses a method for recycling cobalt nickel from tungsten waste recycling slag. The method comprises the steps that firstly, the tungsten waste recycling slag and water mixed to be subjected to size mixing, and a sizing mixture is conveniently obtained; secondly, the sizing mixture is mixed with acid liquor and a reducing agent to be subjected to a reduction reaction, and liquor after reduction is conveniently obtained; and thirdly, the reduced liquor is subjected to solid and liquid separation treatment, and a solution containing cobalt nickel is conveniently obtained. The method is adopted to effectively recycle metal elements like metal cobalt nickel in the tungsten waste recycling slag, the process is simple, and the metal recycling rate is high.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of cobalt and nickel, and in particular relates to a method for recovering cobalt and nickel from tungsten waste recycling slag. Background technique [0002] Tungsten waste recycling slag is a kind of recycling slag rich in cobalt and nickel. The slag mainly contains cobalt oxide, nickel oxide, etc. For a long time, such recycled slag has been recovered by strong acid reduction wet leaching technology to recover cobalt and nickel metals in the slag, and the reducing agents are mainly sodium sulfite, sulfur dioxide, hydrogen peroxide, etc. On the one hand, the amount of reducing agent added in the treatment process is large; on the other hand, sodium sulfite and sulfur dioxide will release sulfur dioxide gas during use, and the leaching time is long and the leaching rate is not high. [0003] Therefore, the existing technology for recovering nickel and cobalt from tungsten waste recycling slag n...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B23/00
CPCC22B7/007C22B7/04C22B23/0415C22B23/0423C22B23/043C22B23/0461Y02P10/20
Inventor 贺石强王世良胡庆民
Owner XIAMEN TUNGSTEN
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