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Gradual depth method for removing metal ion impurity from nickel anode electrolyte

A technology of impurity metal ions and electrolyte, applied in the field of nickel production, can solve the problem of inability to deeply remove impurity ions iron and lead, and achieve the effect of satisfying production requirements and simple process

Inactive Publication Date: 2014-10-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] If those skilled in the art only use CN101050487A and CN1598012A in combination, it is also impossible to achieve deep removal of impurity ions, especially iron and lead

Method used

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  • Gradual depth method for removing metal ion impurity from nickel anode electrolyte

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Effect test

Embodiment 1

[0046] (1) Tributyl phosphate (TBP) was used as the extraction agent, sulfonated kerosene was used as the diluent, and Fe was removed by two-stage countercurrent cascade extraction 3+ , to obtain the feed liquid composed as shown in Table 2, the organic phase is washed and stripped with water, and all the Fe in the nickel electrolyte is recovered 3+ , the organic phase is recycled;

[0047] (2) Use nickel carbonate to adjust the pH of the solution to 1, then add sodium sulfide to form CuS, PbS and CoS precipitates, and remove all Cu in the system 2+ , most of the Pb 2+ and a small amount of Co 2+ , obtain the feed liquid of composition as shown in table 3;

[0048] (3) Use 25ml of weakly basic anion resin D301 to adsorb for 1h to remove Pb 2+ , to obtain a feed liquid composed as shown in Table 4, and adsorbed Pb 2+ The resin is regenerated using NaOH solution;

[0049] (4) Chlorine removal of Co 2+ , to obtain a nickel electrolyte.

Embodiment 2

[0051] (1) Dimethylheptane methyl phosphate (P350) was used as the extractant, n-heptane was used as the diluent, and Fe was removed by 2-stage countercurrent cascade extraction 3+ , to obtain the feed liquid composed as shown in Table 2, the organic phase is washed and stripped with water, and all the Fe in the nickel electrolyte is recovered 3+ , the organic phase is recycled;

[0052] (2) Adjust the pH of the solution to 0.5, then add sodium sulfide to form CuS, PbS and CoS precipitates, and remove all Cu in the system 2+ , most of the Pb 2+ and a small amount of Co 2+ , obtain the feed liquid of composition as shown in table 3;

[0053] (3) Use 25ml of weakly basic anion resin D318 to adsorb for 2h to remove Pb 2+ , to obtain a feed liquid composed as shown in Table 4, and adsorbed Pb 2+ The resin is regenerated using HCl solution;

[0054] (4) Chlorine removal of Co 2+ , to obtain a nickel electrolyte.

Embodiment 3

[0056] (1) Using butyl dibutyl phosphonate (DBBP) as the extractant, n-hexane as the diluent, and two-stage countercurrent cascade extraction to remove Fe 3+ , to obtain the feed liquid composed as shown in Table 2, the organic phase is washed and stripped with water, and all the Fe in the nickel electrolyte is recovered 3+ , the organic phase is recycled;

[0057] (2) Use nickel carbonate to adjust the pH of the solution to 3, then add nickel sulfide to form CuS, PbS and CoS precipitates, and remove all Cu in the system 2+ , most of the Pb 2+ and a small amount of Co 2+ , obtain the feed liquid of composition as shown in table 3;

[0058] (3) Use 25ml of weakly basic anion resin D315 to adsorb for 1.5h to remove Pb 2+ , to obtain a feed liquid composed as shown in Table 4, and adsorbed Pb 2+ The resin is regenerated using HCl solution;

[0059] (4) Chlorine removal of Co 2+ , to obtain a nickel electrolyte.

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Abstract

The invention relates to a gradual depth method for removing metal ion impurities from a nickel anode electrolyte. The method is as below: extracting by using an extractant to remove Fe<3+>; adjusting the pH value of the solution to 0.5-3, then adding sulfide to generate CuS, PbS and CoS precipitate, and removing all the Cu<2+>, most of the Pb<2+> and a small amount of Co<2+>; using weak alkaline anion resin adsorption to remove Pb<2+>; and removing Co<2+> to obtain the nickel electrolyte. The method can realize gradual depth removal of the metal impurities, and ultimately meet the requirements of industrial production indexes on the contents of various metal ion impurities in nickel electrolyte.

Description

technical field [0001] The invention relates to the production field of nickel, in particular, the invention relates to a step-by-step deep removal method for impurity metal ions in nickel anolyte. Background technique [0002] Nickel anolyte usually contains Fe 3+ ,Co 2+ ,Cu 2+ ,Pb 2+ Impurities such as metal ions, in order to produce high-purity nickel products, need to be removed before electrolytic production, especially Pb 2+ Deep removal is required to meet the production needs of nickel electrolysis. The current purification process is under great pressure when dealing with high-lead materials. Electrolytic nickel has extremely strict requirements on lead. According to GB / T6516-2010 electrolytic nickel implementation standard, Ni9996 requires electrolytic nickel to contain no more than 0.0015% lead. Since lead will be precipitated on the cathode together with nickel during the electrolysis process, it is necessary to control the lead concentration in the nickel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08
Inventor 赵君梅潘峰刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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