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Method and system for extracting cobalt and nickel from tungsten waste recovery slag

A technology of tungsten waste and cobalt-nickel, which is applied in the field of cobalt-nickel recycling and reuse, can solve the problems of low leaching rate, long leaching time and large size; on the other hand, sodium sulfite and sulfur dioxide will release sulfur dioxide gas during use. Achieve the effect of simple process and high metal recovery rate

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

AI Technical Summary

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 and system for extracting cobalt and nickel from tungsten waste recovery slag
  • Method and system for extracting cobalt and nickel from tungsten waste recovery slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] S1. Dry 2000kg of tungsten waste recycling slag (the mass content of cobalt oxide is 5%, and the mass content of nickel oxide is 8%) at 100°C for 12 hours. After drying, the material is placed in a crushing equipment for crushing. After crushing, the material is fine Degree 60 mesh.

[0056] S2. Place the crushed material obtained in S1 into a reduction furnace for reduction at a temperature of 500°C and a hydrogen flow rate of 4m 3 / h, the reaction time is 16h.

[0057] S3, adjust the roasted material obtained in S2, the solid-to-liquid ratio is 1:3, add 0.3m concentrated sulfuric acid to the slurry 3 , heated to 60°C, reacted for 1h, residual acid 10g / l. After the reaction, the feed liquid is filtered through solid-liquid separation equipment to remove waste residue, and a solution containing cobalt and nickel is obtained. The recovery rate of cobalt is 96.3%, and the recovery rate of nickel is 95.8%.

Embodiment 2

[0059] S1. Dry 1500kg of tungsten waste recovery slag (the mass content of cobalt oxide is 10%, and the mass content of nickel oxide is 2%) at 150°C for 8 hours. After drying, the material is placed in a crushing equipment for crushing. After crushing, the material is fine Degree 75 mesh.

[0060]S2. Place the crushed material obtained in S1 in a reduction furnace for reduction at a temperature of 600°C and a hydrogen flow rate of 6m 3 / h, the reaction time is 14h.

[0061] S3, adjust the roasted material obtained in S2, the solid-to-liquid ratio is 1:5, add concentrated hydrochloric acid 0.6m 3 , heated to 80°C, reacted for 5h, residual acid 30g / l. After the reaction, the feed liquid is filtered through solid-liquid separation equipment to remove waste residue, and a solution containing cobalt and nickel is obtained. The recovery rate of cobalt is 95.8%, and the recovery rate of nickel is 96.1%.

Embodiment 3

[0063] S1. Dry 1200kg of tungsten waste recovery slag (the mass content of cobalt oxide is 22%, and the mass content of nickel oxide is 10%) at 200°C for 6 hours. After drying, the material is placed in a crushing equipment for crushing. After crushing, the material is fine Degree 100 mesh.

[0064] S2. Place the crushed material obtained in S1 into a reduction furnace for reduction at a temperature of 700°C and a hydrogen flow rate of 8m 3 / h, the reaction time is 12h.

[0065] S3, adjust the roasted material obtained in S2, the solid-to-liquid ratio is 1:8, add concentrated phosphoric acid 0.5m 3 , heated to 90°C, reacted for 12 hours, and left acid 60g / l. After the reaction, the feed liquid is filtered through solid-liquid separation equipment to remove waste residue, and a solution containing cobalt and nickel is obtained. The recovery rate of cobalt is 96.5%, and the recovery rate of nickel is 96.1%.

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Abstract

The invention discloses a method and system for extracting cobalt and nickel from tungsten waste recovery slag. The method comprises the steps that (1) the tungsten waste recovery slag is dried and crushed to obtain crushed slag; (2) reduction roasting is conducted on the crushed slag to obtain a roasting material; (3) the roasting material is mixed with an acid solution for size mixing, and mixedslurry is obtained; and (4) solid-liquid separation treatment is conducted on the mixed slurry to obtain a cobalt-nickel-containing solution. According to the method, the tungsten waste recovery slagis dried and crushed and then subjected to reduction roasting, high-valence nickel and cobalt in the tungsten waste recovery slag are reduced into low valence, then the low-valence nickel and cobaltare mixed with the acid solution for size mixing, so that the cobalt and nickel elements enter the solution, and then metal cobalt, nickel and other metal elements in the tungsten waste recovery slagcan be effectively recovered through solid-liquid separation. The process is simple, the metal recovery rate is high, and compared with a traditional wet acid reduction leaching process, no harmful gas is emitted in the treatment process.

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 and a system for extracting 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 rec...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B5/12C22B23/02C22B23/00
CPCC22B1/02C22B5/12C22B7/001C22B7/007C22B7/04C22B23/021C22B23/0415Y02P10/20
Inventor 王世良胡庆民
Owner XIAMEN TUNGSTEN