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Method for two-stage leaching of nickel and cobalt from crude nickel and cobalt hydroxide

A nickel-cobalt hydroxide, two-stage leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of extraction and impurity removal pressure, and achieve the effect of reducing leaching costs, reducing sulfuric acid consumption and water consumption

Inactive Publication Date: 2020-11-10
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In the process of acid dissolution, sulfuric acid is generally used for dissolution and leaching, and some reducing agents such as sodium metabisulfite and hydrogen peroxide are added to assist leaching. Although this leaching method can increase the leaching rate of nickel and cobalt, at the same time, a large amount of impurities such as manganese will follow. It is leached into the solution, which brings pressure to the subsequent extraction and removal of impurities

Method used

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  • Method for two-stage leaching of nickel and cobalt from crude nickel and cobalt hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A Circular magnesium washing: according to the liquid-solid ratio of 3.5 to 1, cyclic magnesium washing, add 1 / 3 of the second-stage magnesium washing liquid into the first-stage magnesium washing, and leaching at room temperature for 0.5h, at this time, the washing rate of magnesium element is 60.5% .

[0027] Stage B leaching: After washing, the filter cake is slurried at a liquid-solid ratio of 3.8 to 1. When the leaching temperature is 70°C, sulfuric acid is added to adjust the pH value of the solution to keep it at about 2.0. After leaching for 1.5 hours, the acid-mineral ratio at this time is 0.68 , after the end, the leaching slurry is press-filtered and solid-liquid separated to obtain a section of leachate and a section of leaching slag. The leaching rates of nickel and cobalt elements in this section are 97.8% and 83.3% respectively, and the leaching rate of the first section of slag is 10%.

[0028] C Second-stage leaching: Use the first-stage leaching slag a...

Embodiment 2

[0031] A Circular washing of magnesium: Circular washing of magnesium according to the liquid-solid ratio of 3.5 to 1, adding 1 / 3 of the washing solution of the second-stage magnesium washing to the first-stage magnesium washing, and leaching at room temperature for 1 hour. At this time, the washing rate of magnesium element is 61%.

[0032] Stage B leaching: After washing, the filter cake is slurried at a liquid-solid ratio of 4 to 1. When the leaching temperature is 75°C, sulfuric acid is added to adjust the pH value of the solution to keep it at about 1.5. After leaching for 2 hours, the acid-mineral ratio at this time is 0.7. After the completion, press filter the leaching slurry and separate solid and liquid to obtain a first stage of leachate and a stage of leaching slag. The leaching rates of nickel and cobalt elements in this stage are 98.2% and 85.5% respectively, and the leaching rate of the first stage of slag is 10%.

[0033] C Second-stage leaching: Use the first-s...

Embodiment 3

[0036] A Circular washing of magnesium: according to the liquid-solid ratio of 4 to 1, cyclic washing of magnesium, adding 1 / 3 of the second-stage magnesium washing solution to the first-stage magnesium washing, leaching at room temperature for 1 hour, and the washing rate of magnesium element is 62%.

[0037] Stage B leaching: After washing, the filter cake is slurried at a liquid-solid ratio of 4 to 1. When the leaching temperature is 75°C, add sulfuric acid to adjust the pH value of the solution to keep it at about 2.5. After leaching for 1.5 hours, the acid-mineral ratio at this time is 0.69 , after the end, the leaching slurry is press-filtered and solid-liquid separated to obtain a section of leachate and a section of leaching slag. The leaching rates of nickel and cobalt elements in this section are 97% and 83% respectively, and the leaching rate of the first section of slag is 10%.

[0038] C Second-stage leaching: Use the first-stage leaching slag as the raw material f...

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Abstract

The invention discloses a method for two-stage leaching of nickel and cobalt from crude nickel cobalt hydroxide, and belongs to the technical field of hydrometallurgy. The method comprises the following steps that A, circulating magnesium washing is carried out, specifically, the crude nickel and cobalt hydroxide and water are mixed and stirred and then are washed, and the filter pressing is carried out after washing; B, first-stage leaching is carried out, specifically, the second-stage magnesium washing filter cake is pulpified in a stirring tank, sulfuric acid leaching is carried out, and then solid-liquid separation is carried out; C, second-stage leaching is carried out, specifically, the first-stage leaching residues are used as raw materials for second-stage leaching, part of sulfuric acid is added, the second-stage leaching is carried out, then the solid-liquid separation is carried out, and the second-stage leaching residues are washed; and D, the second-stage leaching solution and the washing water are refluxed, specifically, the second-stage leaching solution obtained in step C is mixed with the washing water, the step B is carried out for the first-stage leaching, and the mixture and the second-stage magnesium washing filter cake are pulpified in the stirring tank. According to the method, nickel and cobalt are efficiently leached from the crude cobalt nickel hydroxide only under the conditions of sulfuric acid leaching and no addition of other reducing agents, meanwhile, leaching of manganese elements can be reduced, and the method has the advantages of being easy to operate, capable of saving the production cost, high in nickel and cobalt leaching rate and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and relates to a method for leaching nickel and cobalt in two stages from crude nickel and cobalt hydroxide. Background technique [0002] Nickel sulfate is widely used in electroplating, battery materials, catalysts, pigments and other industries. In recent years, with the development of aluminum profile surface treatment technology and the upgrading of battery products, the application field of nickel sulfate has been continuously expanded. Nickel sulfate is one of the main raw materials of ternary batteries, and the market demand is increasing year by year. [0003] Nickel cobalt hydroxide, one of the intermediate products of laterite nickel ore, has become one of the main nickel raw materials for electrolytic nickel and nickel salt. Generally, in the sulfuric acid system, the crude nickel cobalt hydroxide prepared from nickel sulfide concentrate is used as the raw material, and the n...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B23/00
CPCC22B3/08C22B23/043Y02P10/20
Inventor 张学东刘三平王海北郑朝振邓超群秦树辰周起帆
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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