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Method for preparing nickel sulfate by ordinary-pressure decomposed high ice nickel

A technology of nickel sulfate and nickel matte, which is applied in the field of metallurgy to achieve the effects of short treatment process, low production cost and simple operation

Inactive Publication Date: 2019-10-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems existing in the process of preparing nickel sulfate from existing high nickel matte, the purpose of the present invention is to propose a method for decomposing high nickel matte at normal pressure to prepare nickel sulfate. Based on the affinity difference between different metals and sulfur, the It can realize the selective leaching of nickel and cobalt in high nickel matte, while copper still exists in the leaching slag in the form of copper sulfide, realizing the separation of nickel and copper in high nickel matte, the nickel leaching rate can reach more than 99%, and it also simplifies the Subsequent purification and impurity removal process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The composition of high nickel matte used is shown in Table 1:

[0022] Table 1 Main composition and content wt% of high nickel matte

[0023] components Ni Cu co Fe S content 46.2 26.6 0.62 3.2 21.4

[0024] Grind high-matte nickel to -200 mesh, take 10g and add it to 100ml of 4mol / L sulfuric acid, react at 95°C for 2 hours, separate solid and liquid after the reaction is complete, and obtain filter residue and leaching solution containing nickel, cobalt, and iron, nickel, cobalt, and iron The leaching rates of cobalt were 99% and 99.2% respectively; the leaching liquid was returned to the normal pressure leaching process after being supplemented with acid to 4mol / L, and the filter residue was mixed with deionized water and stirred for 10 minutes according to the ratio of liquid-solid ratio of 5ml:1g, and the solid-liquid After separation and washing, the copper-containing slag and solution with a copper content of 73.4% are obtained. T...

Embodiment 2

[0026] The high matte nickel used is consistent with the composition of Example 1. Grind the high-matte nickel to -200 mesh, take 10g and add it to 50ml6mol / L sulfuric acid, react at 80°C for 4h, separate the solid and liquid after the reaction is complete, and obtain the filter residue and leachate containing nickel, cobalt and iron, nickel, cobalt The leaching rates were 99.1% and 99.4% respectively; the leaching solution was supplemented with acid to 6mol / L and then returned to the normal pressure leaching process, and the filter residue was mixed with deionized water according to the liquid-solid ratio of 2ml:1g and stirred for 30 minutes, and the solid-liquid separation After washing, the copper-containing slag and solution with a copper content of 73.5% are obtained. The copper-containing slag can be used for copper smelting, and the resulting solution is returned to the pulping process. After 4 cycles of pulping, Ni is obtained. 2+ A solution with a concentration of 92....

Embodiment 3

[0028] The high matte nickel used is consistent with the composition of Example 1. Grind the high-matte nickel to -300 mesh, take 50g and add it to 50ml of 10mol / L sulfuric acid, react at 50°C for 5h, separate the solid and liquid after the reaction is complete, and obtain the filter residue and the leaching solution containing nickel, cobalt and iron, nickel, cobalt The leaching rates were 99.2% and 99.4% respectively; the leaching solution was supplemented with acid to 10mol / L and then returned to the normal pressure leaching process, and the filter residue was mixed with deionized water according to the liquid-solid ratio of 5ml:1g and stirred for 15min, and the solid-liquid separation After washing, the copper-containing slag and solution with a copper content of 73.1% are obtained. The copper-containing slag can be used for copper smelting, and the obtained solution is returned to the pulping process. After 3 cycles of pulping, Ni is obtained. 2+ A solution with a concent...

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Abstract

The invention discloses a method for preparing nickel sulfate by ordinary-pressure decomposed high ice nickel. The method for preparing the nickel sulfate by the ordinary-pressure decomposed high icenickel comprises the following steps that (1) the high ice nickel is crushed and added into a 4-10 mol / L concentrated sulfuric acid solution, solid-liquid separation is carried out after reaction to obtain filter residues and filter liquor, and the obtained filter liquor is refilled to the concentration of sulfuric acid of 4-10 mol / L to return to ordinary-pressure decomposition of the high ice nickel; and (2) filtration washing is carried out after size mixing and stirring are carried out on the filter residue to obtain the filter liquor containing nickel, iron and cobalt and the cooper-bearing filter residue, the cooper-bearing filter residue is used for smelting cooper, and the filter liquor containing the nickel, the iron and the cobalt is returned to perform size mixing on the filter residue obtained in the step (1); and when the Ni<2+> concentration in the filter liquor containing the nickel, the iron and the cobalt is greater than or equal to 90g / L, evaporative crystallization iscarried out after neutralization deironing and extraction cobalt removal are carried out to obtain a nickel sulfate crystal. According to the method for preparing the nickel sulfate by the ordinary-pressure decomposed high ice nickel, selective leaching of the nickel and the cobalt in the high ice nickel can be realized under the ordinary pressure condition, the cooper exists in leaching residuein a sulfide form of the cooper, and the nickel and cooper separation in the high ice nickel is realized.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing nickel sulfate by decomposing high-matte nickel under normal pressure. Background technique [0002] The explosive growth of new energy vehicles has led to a sharp increase in market demand for lithium-ion battery cathode materials. Due to the characteristics of high voltage, high conductivity, excellent rate and cycle performance, ternary cathode materials have become lithium-ion battery cathode materials for new energy vehicles. first choice. The rapid development of the field of power batteries has also led to a rapid increase in the market demand for nickel sulfate. According to statistics, the demand for battery-grade nickel sulfate in 2016 was about 74,000 tons. In 2017, the demand for battery-grade nickel sulfate increased to 126,000 tons, an increase of 70%. In 2018, the demand for battery-grade nickel sulfate was about 160,000 tons. It is expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10
CPCC01G53/10C01P2006/80
Inventor 刘旭恒赵中伟黄家豪刘旭陈星宇李江涛何利华
Owner CENT SOUTH UNIV
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