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A method for reducing cobalt content in mixed slag in nickel sulfate production

A technology of nickel sulfate and cobalt content, applied in the direction of improving process efficiency, can solve the problems of affecting the yield of cobalt metal, failing to be separated and utilized, and containing cobalt in leaching slag, so as to reduce the content of cobalt metal, simple operation, Yield-enhancing effect

Active Publication Date: 2018-07-20
金川集团镍盐有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the nickel-cobalt hydroxide solid material contains cobalt multivalent metal elements, it cannot completely enter the solution during sulfuric acid leaching, resulting in a high cobalt content in the leaching slag.
The leaching solution adopts chemical method to remove calcium, magnesium, iron and lead, and the mixed slag formed by the precipitation slag and the leaching slag contains 1.5-2.5% cobalt. This part of cobalt metal remains in the mixed slag, which cannot be effectively separated and utilized, affecting the cobalt. Economic and technical indicators such as metal yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Flush the mixed slag weighing about 5 tons into 10m with hot water 3 Stir the slurry in the reactor, and then pump the slurry into 30m 3 The reaction kettle was filled with hot water, heated to about 80°C with steam, slowly added 350g / l dilute sulfuric acid to adjust the pH to 2.2, and kept the reaction temperature for 1.0h. Concentrated hydrochloric acid was slowly added to the slurry to adjust the pH to 1.3, and the reaction temperature was maintained to continue the reaction for 1.0 h. Then the slurry is pumped into the filter press for solid-liquid separation. After the filter press is stopped, hot water with a temperature of 80°C to 90°C is pumped into the filter press to wash the filter cake until the filter press filtrate is colorless. Then pass the high-pressure air into the filter press and blow for more than 30 minutes, until the filter cake is dried, stop the high-pressure air, and unload the filter cake.

[0031] After treatment, the mixed residue Co: 0.36%, mo...

Embodiment 2

[0033] Wash the mixed slag weighing about 4 tons into 10m with hot water 3 Stir the slurry in the reactor, and then pump the slurry into 30m 3 The reaction kettle was filled with hot water, heated to about 80°C with steam, slowly added dilute sulfuric acid with a concentration of 290g / l to adjust the pH to 2.5, and kept the reaction temperature to react for 1.0h. Concentrated hydrochloric acid was slowly added to the slurry to adjust the pH to 1.0, and the reaction temperature was maintained for 1.0 h. Then the slurry is pumped into the filter press for solid-liquid separation. After the filter press is stopped, hot water with a temperature of 80°C to 90°C is pumped into the filter press to wash the filter cake until the filter press filtrate is colorless. Then pass the high-pressure air into the filter press and blow for more than 20 minutes, until the filter cake is dried, stop the high-pressure air, and unload the filter cake.

[0034] After treatment, the mixed residue Co: 0....

Embodiment 3

[0036] The mixed slag weighing about 5 tons is flushed into 10m with hot water 3 Stir the slurry in the reactor, and then pump the slurry into 30 m 3 The reaction kettle is filled with hot water, heated to about 80°C with steam, slowly added with dilute sulfuric acid with a concentration of 400g / l to adjust the pH to 2.0, and the reaction temperature is maintained for 1.0h. Concentrated hydrochloric acid was slowly added to the slurry to adjust the pH to 1.5, and the reaction temperature was maintained for 1.0 h. Then the slurry is pumped into the filter press for solid-liquid separation. After the filter press is stopped, hot water with a temperature of 80°C to 90°C is pumped into the filter press to wash the filter cake until the filter press filtrate is colorless. Then pass the high-pressure air into the filter press and blow for 40 minutes until the filter cake is dried, stop the high-pressure air, and unload the filter cake.

[0037] After treatment, the mixed residue Co: 0....

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Abstract

The invention belongs to the technical field of nickel-cobalt wet metallurgy, and specifically relates to a method for reducing the content of cobalt in mixed slag generated in nickel sulfate production. The nickel-cobalt hydroxide material is leached by sulfuric acid at first, then the leach residues and leachate are subjected to a chemical precipitation method to remove calcium, magnesium, iron, and lead, the generated mixed slag is subjected to pulping and heating, then diluted sulfuric acid with a concentration of 290 to 400 g / L and concentrated hydrochloric acid are added in sequence to adjust the pH value; and finally technologies such as pressure filtration, water washing, blow-drying, and the like, are carried out to reduce the cobalt content of the mixed slag from 1.5-2.5% to less than 0.6%. The operation is simple, the cobalt content of discharged slag is effectively reduced, the cobalt yield is increased, and high economic benefits are generated.

Description

Technical field [0001] The invention belongs to the technical field of nickel-cobalt hydrometallurgy, and specifically relates to a method for reducing the cobalt content in mixed slag in the production of nickel sulfate. Background technique [0002] In hydrometallurgical production, the leaching systems of various nickel-cobalt solid materials mainly include sulfuric acid system, hydrochloric acid system or nitric acid system. Usually the cobalt-containing materials of trivalent cobalt are leached by hydrochloric acid system or sulfuric acid system, and the reducing agent is mostly sodium sulfite or sulfur dioxide. The leaching residue produced after leaching is washed and stored. [0003] In the production process of industrial nickel sulfate, the leaching of nickel and cobalt hydroxide solid materials adopts sulfuric acid system. Since the solid material of nickel and cobalt hydroxide contains multivalent metal elements of cobalt, the sulfuric acid cannot completely enter the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B7/00
CPCC22B7/007C22B23/043Y02P10/20
Inventor 张双泉邢晓钟董存武叶剑鸣孟茂勇孙正德
Owner 金川集团镍盐有限公司