Method for removing impurities from nickel electrolysis anolyte

A technology of anolyte and nickel electrolysis, applied in electrolysis process, electrolysis components, photographic technology, etc., can solve problems such as hindering copper removal, achieve fast reaction speed, ensure copper removal depth, and eliminate adverse effects

Inactive Publication Date: 2013-09-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, based on the fact that the current nickel smelting purification is carried out in accordance with the process of first removing iron, then removing copper, and finally removing cobalt, the use of FeS as a copper removing agent has not bee...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the comparison of the solution copper removal treatment process prepared by nickel salt and copper salt

[0032] According to the method of the prior art (Wang Feidysium, et al. Research on deep purification and copper removal from nickel electrolyte by nickel sulfide precipitation conversion method, Hunan Metallurgy, 1993, 5:21-23.), when using the prepared solution to be treated (nickel The content of ions is 65g / L, the content of copper ions is 0.6g / L, the solution of sodium ions is 33.4g / L, and the content of chloride ions is 51.6g / L.) When removing copper, add newly prepared NiS, and the reaction formula is:

[0033] NiS+Cu 2+ →CuS+Ni 2+ (1)

[0034] The reaction time is more than 40 minutes, and the copper removal rate of 99.4% can be achieved. When using 1.2 times (NiS / Cu molar ratio) optimal amount of NiS to remove copper, although the copper can be removed to 1.2mg / L, the excess NiS enters the copper removal slag, resulting in the ratio o...

Embodiment 2

[0044] Embodiment 2: different solutions to be treated use FeS to remove copper addition and time comparison

[0045] Under the conditions of FeS / Cu molar ratio of 1.2 and reaction time of 10 minutes, the effects of different solutions to be treated on the copper removal effect of FeS were studied, and the results are shown in Table 2. The nickel electrolytic anolyte used in the factory comes from Jinchuan Group, in which the content of nickel ions is 75.5g / L, the content of copper ions is 0.5g / L, the solution of sodium ions 25g / L, chloride ions 74.9g / L, and cobalt ions 0.15g / L, iron ion 0.35g / L.

[0046] Table 2. Copper removal effect of FeS in different solutions to be treated

[0047]

Homemade Nickel and Copper Salt Solutions

Anolyte for nickel electrolysis in factory

Residual copper concentration / mg / L

0.80

0.82

Ratio of copper to nickel in copper removal slag

55

9.6

[0048] Self-made nickel salt and copper salt so...

Embodiment 3

[0051] In Example 3-11, the nickel electrolysis anolyte used comes from Jinchuan Group, and its composition is: the content of nickel ion is 75.5g / L, the content of copper ion is 0.5g / L, sodium ion 25g / L, chloride ion 74.9 g / L solution, cobalt ion 0.15g / L, iron ion 0.35g / L. FeS is a new ecological FeS, which is 0.1M FeCl 2 The solution is mixed with 0.1M NaS solution, and after the precipitation occurs, the precipitation is added to the solution to be treated in proportion within half an hour.

[0052] First, the nickel electrolytic anolyte was heated to 51 °C and NiCO 3 Adjust the pH value to 4.1, then add FeS according to the Fe / Ni molar ratio of 1.15, react for 15 minutes, separate the solution and precipitate, and obtain copper-removed slag and copper-removed liquid. The ratio of copper to nickel in the copper removal slag is 84, and the copper concentration in the liquid after copper removal is 2.3mg / L.

[0053] NiCO 3 Adjust the pH value to 5.4, and then pass chlorin...

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PUM

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Abstract

The invention provides a method for removing impurities from nickel electrolysis anolyte. The method comprises the steps that: (1) a pH value of a solution to be treated is regulated to 3.0-5.0; nascent-state FeS is added, and a reaction is allowed, such that copper is removed; liquid-solid separation is carried out, such that copper-removed liquid is obtained; (2) chlorine and/or air is delivered into the copper-removed liquid, such that Fe<2+> and Co<2+> are oxidized, and Fe(OH)3 and Co(OH)3 precipitates are formed; and solid-liquid separation is carried out, such that a nickel sulfate solution is obtained. According to the method provided by the invention, FeS is used for removing copper, and a copper removing reaction speed is fast, such that copper in the solution can be deeply removed within minutes. Copper removing depth can be ensured, and high copper-nickel ratio can be obtained in the copper-removing slag. With the rapid reaction copper-removing characteristic, FeS is suitable for large-scale industrialized production copper removing. According to the invention, the copper-removing process is changed to before the iron-removing process, such that adverse reaction by a high-potential solution to the copper-removing process is eliminated. Copper-removing reaction speed is fast, such that the method is suitable for industrialized large-scale production copper removing.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal smelting, and in particular relates to a method for removing impurities from non-ferrous metal electrolytic solution through precipitation replacement. Background technique [0002] my country's electro-nickel has very strict requirements on impurity content. According to the national standard (GB / T 6516-1997 Ni9996), Fe≤0.01%, Co≤0.02%, and Cu≤0.01%. In order to obtain qualified electrolytic nickel, the impurities Fe, Co and Cu in the nickel electrolytic solution must be deeply removed. Copper and nickel have similar chemical properties, so it is difficult to remove it deeply from nickel-containing solutions. For this reason, a large number of scholars have developed various copper removal methods, such as active nickel sulfide, nickel thiosulfate, nickel thiocarbonate and other copper removal processes. These nickel-containing compounds have high chemical reactivity and can deeply remove coppe...

Claims

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Application Information

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IPC IPC(8): C25C1/08C25C7/06
Inventor 赵中伟陈星宇
Owner CENT SOUTH UNIV
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