Purification and cobalt removal method for zinc leaching solution

A leaching solution and leaching technology, which is applied in the direction of photographic process, instrument, photographic auxiliary process, etc., can solve the problems of increased difficulty in separation of nickel and cobalt, low extraction rate, environmental impact, etc.

Inactive Publication Date: 2019-03-29
GUIZHOU INST OF METALLURGY & CHEM ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the process of replacement and removal of impurities, not only a large amount of zinc powder needs to be consumed, resulting in high processing costs, but also the entry of impurities such as antimony and arsenic, which affects the quality of the final product. A large amount of zinc powder, but it needs to introduce organic components, which will seriously affect the environment, and the difficulty of separating nickel and cobalt will also increase significantly
[0003] Usually, zinc-containing nickel-cobalt waste slag, after sulfuric acid leaching treatment, in the obtained sulfuric acid leach solution, the concentration of zinc ions is as high as 30g/L or more, and at this time the content of nickel ions and cobalt ions is also above 1g/L. Use P 2 0 4 ,P 5 0 7 , C-272 and other phosphorus extractants for separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation and treatment of leachate:

[0023] Wash the nickel-cobalt waste slag containing zinc with hot water at 60°C, and then leaching it for 5 hours at a temperature of 88°C with a liquid-solid mass ratio of 4:1 and a mass volume fraction of 170g / L in a sodium hydroxide solution to obtain the leachate and leach residue;

[0024] In the leaching solution: zinc 38.5g / L, cobalt 0.9g / L, nickel 0.08g / L, sodium hydroxide concentration 149.1g / L; leaching slag: nickel 6%.

[0025] Secondary leaching treatment of the leaching residue with a sodium hydroxide solution with a liquid-solid mass ratio of 4:1 and a mass volume fraction of 170 g / L for 5 hours, to obtain a secondary leaching solution and a secondary leaching residue;

[0026] Secondary leaching solution: zinc 19.3g / L, cobalt 0.5g / L, nickel 0.06g / L, sodium hydroxide concentration 163.5g / L. The secondary leaching solution was returned to be prepared into a sodium hydroxide solution with a mass concentration of 180...

Embodiment 2

[0033] Preparation and treatment of leachate:

[0034] Wash the nickel-cobalt waste slag containing zinc with hot water at 80°C, and then leaching for 5 hours at a temperature of 90°C in a sodium hydroxide solution with a liquid-solid mass ratio of 5:1 and a mass volume fraction of 190g / L to obtain the leachate and leach residue;

[0035] In the leaching solution: 45.1g / L of zinc, 1.4g / L of cobalt, 0.13g / L of nickel, and 150.8g / L of sodium hydroxide; in the leaching residue: 9% of nickel.

[0036] Secondary leaching treatment of the leaching residue with a sodium hydroxide solution with a liquid-solid mass ratio of 5:1 and a mass volume fraction of 190 g / L for 5 hours to obtain a secondary leaching solution and a secondary leaching residue;

[0037] Secondary leaching solution: zinc 16.7g / L, cobalt 0.4g / L, nickel 0.04g / L, sodium hydroxide concentration 161.2g / L. The secondary leaching solution was returned to be prepared into a sodium hydroxide solution with a mass concentra...

Embodiment 3

[0044] Preparation and treatment of leachate:

[0045] Wash the nickel-cobalt waste slag containing zinc with hot water at 70°C, and then leaching for 5 hours in a sodium hydroxide solution with a liquid-solid mass ratio of 4.5:1 and a mass volume fraction of 180g / L at a temperature of 89°C to obtain the leachate and leach residue;

[0046] In the leach solution: 43.1g / L of zinc, 1.3g / L of cobalt, 0.11g / L of nickel, and 149.8g / L of sodium hydroxide; in the leaching residue: 7% of nickel.

[0047] Secondary leaching treatment of the leaching residue with a sodium hydroxide solution having a liquid-solid mass ratio of 4.5:1 and a mass volume fraction of 180 g / L for 5 hours to obtain a secondary leaching solution and a secondary leaching residue;

[0048] Secondary leaching solution: zinc 18.6g / L, cobalt 0.45g / L, nickel 0.05g / L, sodium hydroxide concentration 162.6g / L. The secondary leaching solution was returned to be prepared into a sodium hydroxide solution with a mass conce...

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PUM

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Abstract

The invention relates to the technical field of hydrometallurgy, in particular to a purification and cobalt removal method for a zinc leaching solution. Zinc leachate is directly electrolyzed under amagnetic field condition, and the magnetic field intensity is accurately controlled and is kept at 7-9A/m, so that the content of cobalt in electrolyzed liquid is greatly reduced, the removal rate ofthe cobalt is improved, the circulation use capability of the electrolyzed liquid is realized, and the cobalt removal difficulty of the zinc leachate is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for purifying and removing cobalt from a zinc leaching solution. Background technique [0002] The production of metal zinc in my country basically adopts hydrometallurgy, that is, after acid leaching or alkaline leaching of minerals or waste residues such as zinc, to obtain a leaching solution, and then use the leaching solution as an electrolyte to electrolyze zinc. However, the leaching solution contains a large amount of impurities, such as iron, nickel, cobalt, copper, cadmium, arsenic, indium, etc. Among them, cobalt is extremely harmful in the zinc smelting process, and the content of cobalt in the electrolyte exceeds a certain When the amount is too high, it will cause the electrolysis efficiency to drop significantly, and also seriously affect the quality of the electrolytic zinc product. At present, in the hydrometallurgy of zinc, the main method is to...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C25C1/08C25C7/06
CPCC22B7/007C22B7/008C22B23/043C22B23/0446C22B23/0476C25C1/08C25C7/06Y02P10/20
Inventor 刘安荣王振杰刘洪波彭伟钟波
Owner GUIZHOU INST OF METALLURGY & CHEM ENG
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