Method for deep removing nickel and cobalt impurities in zinc hydrometallurgy solution

A technology for hydrometallurgy of zinc and zinc sulfate solution, which is applied in the field of nickel and cobalt, can solve problems such as difficult to meet the development trend of zinc smelting technology, obvious cobalt remelting phenomenon, limited purification depth, etc., and achieves easy industrial implementation and strong activity , the effect of low cost of use

Inactive Publication Date: 2016-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the antimony salt purification method, the cobalt removal efficiency and cobalt removal depth of the arsenic salt purification method are high, and cobalt is not easy to redissolve, so it has strong adaptability and stability, but this method has some fatal shortcomings: in the purification process highly toxic AsH 3 Gas, which brings great pressure to safe production and environmental protection
[0004] Although the antimony salt purification method has a better impurity removal effect than other methods, its purification depth is limited, and cobalt remelting phenomenon is obvious, which makes it difficult for the antimony salt purification method to meet the development trend of zinc smelting technology

Method used

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  • Method for deep removing nickel and cobalt impurities in zinc hydrometallurgy solution
  • Method for deep removing nickel and cobalt impurities in zinc hydrometallurgy solution
  • Method for deep removing nickel and cobalt impurities in zinc hydrometallurgy solution

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Experimental program
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Effect test

Embodiment 1

[0028] Pump 8m into the reactor 3 neutral leaching solution (Zn: 142g / L, Ni: 7.4mg / L, Co: 11.5mg / L), add dilute sulfuric acid to adjust the pH of the solution to about 4.5, stir and heat up to 75°C, and then add 4.4kg of manganese-zinc Binary alloy powder (particle size: -100 mesh, manganese and zinc contents are 94.2% and 3.7% respectively), stirred for 60 minutes, and the filtrate and filter residue were collected by filtration. The contents of nickel and cobalt in the obtained filtrate were respectively 0.15mg / L and 0.52 mg / L, the removal rates of nickel and cobalt were 98.18% and 95.69%, respectively, and the contents of nickel and cobalt in the filter residue were 2.62% and 3.89%, respectively.

[0029] The microscopic morphology and EDS analysis results of manganese-zinc alloy powder before and after cobalt replacement are as follows: figure 1 Shown: by figure 1 a and figure 1 b, it can be seen that the morphology of manganese-zinc alloy powder does not change much be...

Embodiment 2

[0031] Pump 8m into the reactor 3 neutral leaching solution (Zn: 142g / L, Ni: 7.4mg / L, Co: 11.5mg / L), add dilute sulfuric acid to adjust the pH of the solution to about 5, stir and heat up to 85°C, and then add 3.68kg of manganese powder ( The particle size is: -140 mesh, the manganese content is 98.5%), stirred for 80 minutes, and the filtrate and filter residue were collected by filtration. The contents of nickel and cobalt in the obtained filtrate were 0.22mg / L and 0.75mg / L respectively, and the removal rates of nickel and cobalt were respectively The contents of nickel and cobalt in the filter residue are 3.11% and 4.61%, respectively.

[0032] The microscopic morphology and EDS analysis results before and after cobalt extraction by metal manganese powder are as follows: figure 2 Shown: by figure 2 a and figure 2 b It can be seen that the morphology of manganese powder changes greatly before and after replacement, from irregular particles with smooth and dense surface...

Embodiment 3

[0034] Pump 8m into the reactor 3 The neutral leaching solution (Zn: 142g / L, Ni: 7.4mg / L, Co: 11.5mg / L), adjust the pH of the solution to about 3 by adding dilute sulfuric acid, and stir the temperature to 80°C, then add 4.64kg manganese- Copper binary alloy powder (particle size is: -100 mesh, manganese and copper content are respectively 92.5% and 5.1%), stir reaction 50min, filter and collect filtrate and filter residue, in the gained filtrate, nickel, cobalt content are respectively 0.07mg / L, 0.28mg / L, the removal rates of nickel and cobalt were 99.07% and 97.15% respectively, and the contents of nickel and cobalt in the filter residue were 2.41% and 3.69% respectively.

[0035] The microscopic morphology and EDS analysis results of manganese-copper alloy powder before and after cobalt replacement are as follows: image 3 Shown: by image 3 a and image 3 b, it can be seen that the morphology of the manganese-copper alloy powder does not change much before and after the...

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Abstract

The invention discloses a method for deep removing nickel and cobalt impurities in a zinc hydrometallurgy solution. According to the method, manganese metal powder and / or manganese base alloy powder are / is added in a zinc sulfate solution containing nickel and cobalt under the conditions of a certain temperature and a certain pH value, the stirring is conducted for the reaction, and after the reaction is finished, filtering and separating are conducted, and the zinc sulfate solution with the nickel content and the cobalt content both lower than 0.8 mg / L is obtained. According to the method, the nickel impurity and the cobalt impurity in the zinc sulfate solution containing the nickel and the cobalt can be deep removed with the high efficiency and the low cost while impurities doing harm to zinc electrolysis are not guided. The technology process is simple, complex and special equipment is not needed, and good industrial application prospects are achieved.

Description

technical field [0001] The invention relates to a method for removing nickel and cobalt from deep wet zinc smelting solutions, belonging to the field of wet zinc smelting. Background technique [0002] Nickel and cobalt are impurity elements that are extremely harmful to the hydrometallurgy process, especially cobalt ions. When the concentration of cobalt ions in the production system exceeds a certain amount, it will lead to a decrease in the quality of electrolytic zinc and a low current efficiency. As a result, the wet zinc smelting process has extremely strict requirements on the concentration of nickel and cobalt in the system, usually requiring that the concentration of nickel and cobalt are both less than 0.8mg / L. On the other hand, with the application of technologies such as large plate electrolysis and mechanical stripping of zinc, the quality requirements for zinc sulfate solution are higher, and it is urgent to remove nickel and cobalt impurities in zinc sulfate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/46
CPCC22B19/26C22B3/46
Inventor 李玉虎刘志宏高禄鹏刘付朋刘智勇李启厚
Owner CENT SOUTH UNIV
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