Preparation method for reducing sulfur impurities in electrolytic nickel

A technology for electrolysis of nickel and impurities, which is applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc., can solve the problems of impurities sulfur exceeding the standard, achieve the effect of improving sulfur content, high product quality, and improving product quality

Active Publication Date: 2014-01-08
JILIN JIEN NICKEL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chlorine gas is selected as the oxidizing agent, passed into the electrolyte, and the S 2- It becomes chemically stable sulfur, does not increase the sulfur content in electrolytic nickel, and solves the problem of excessive sulfur impurities in electrolytic nickel

Method used

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  • Preparation method for reducing sulfur impurities in electrolytic nickel

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Effect test

Embodiment 1

[0039] The high nickel matte is cast into the anode plate, placed in the electrolytic cell for direct electrolysis of the nickel sulfide anode, the cathode is the nickel starting plate produced by the seed plate tank, the cathode is placed in the diaphragm bag, and the purified electrolyte enters the cathode chamber, the cathode chamber The liquid level is always higher than that of the anode chamber, so that the anolyte with high impurities cannot enter the cathode chamber. Electrolytic nickel is produced by passing electricity in the electrolytic cell. The purification of anolyte adopts three stages of purification: copper removal by extraction, iron removal by oxidation neutralization and cobalt removal by extraction. After normal electrolysis, the impurity sulfur content in the produced electrolytic nickel is as high as 0.1% to 0.005%, and the impurity sulfur content is too high, which seriously affects the electrolysis process. Nickel quality.

Embodiment 2

[0041] The high nickel matte is cast into the anode plate, placed in the electrolytic cell for direct electrolysis of the nickel sulfide anode, the cathode is the nickel starting plate produced by the seed plate tank, the cathode is placed in the diaphragm bag, and the purified electrolyte enters the cathode chamber, the cathode chamber The liquid level is always higher than that of the anode chamber, so that the anolyte with high impurities cannot enter the cathode chamber. Electrolytic nickel is produced by passing electricity in the electrolytic cell. Anolyte purification adopts four-stage purification of extracting copper, oxidizing and neutralizing iron, extracting cobalt and chlorine to reduce sulfur. Among them, chlorine sulfur reduction adopts 20Nm 3 / h~30Nm 3 / h corresponds to electrolyte 40m 3 / h~60m 3 / h reacts in the pipeline to reduce sulfur. After normal electrolysis, the impurity sulfur in the produced electrolytic nickel is less than 0.01%, which is difficu...

Embodiment 3

[0043] The high nickel matte is cast into the anode plate, placed in the electrolytic cell for direct electrolysis of the nickel sulfide anode, the cathode is the nickel starting plate produced by the seed plate tank, the cathode is placed in the diaphragm bag, and the purified electrolyte enters the cathode chamber, the cathode chamber The liquid level is always higher than that of the anode chamber, so that the anolyte with high impurities cannot enter the cathode chamber. Electrolytic nickel is produced by passing electricity in the electrolytic cell. Anolyte purification adopts four-stage purification of extracting copper, oxidizing and neutralizing iron, extracting cobalt and chlorine to reduce sulfur. Among them, chlorine sulfur reduction uses 30Nm 3 / h~50Nm 3 / h corresponds to electrolyte 40m 3 / h~60m 3 / h at an effective volume of 80m 3 The storage tank reacts to reduce sulfur. After normal electrolysis, the impurity sulfur in the produced electrolytic nickel is 0...

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Abstract

The invention discloses a preparation method for reducing sulfur impurities in electrolytic nickel, belonging to the technical field of wet-process metallurgy. The preparation method comprises the following steps of casting nickel matte into an anode plate, and putting the anode plate in an electrolytic bath to perform vulcanization so as to directly electrolyze a nickel anode; taking a nickel starting sheet produced in a starting sheet cell as a cathode, and putting the cathode into a diaphragm bag; putting purified electrolyte into a cathode chamber, wherein the liquid level of the cathode chamber is higher than that of an anode chamber to ensure that an anode liquid can not enter the cathode chamber; electrifying in the electrolytic bath to generate electrolytic nickel; purifying the anode liquid, namely performing four-stage purification including copper removal through extraction, iron removal through oxidation neutralization, cobalt removal through extraction and sulfur reduction. The sulfur impurities in the electrolytic nickel generated through normal electrolysis is less than 0.001%, and the average content of the sulfur impurities is 0.0005%. According to the preparation method disclosed by the invention, a normal soluble anode is used as a template, and the content of the sulfur impurities in an electrolytic nickel plate is reduced by reducing the sulfur content in the cathode liquid, so that an electrolytic nickel finished product with extremely low content of the sulfur impurities is obtained. The process method is simple, and can effectively control the content of the sulfur impurities in the electrolytic nickel, and the obtained high-quality electrolytic nickel finished product can be widely applied.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a preparation method for reducing impurity sulfur in electrolytic nickel. Background technique [0002] High nickel matte is directly cast into the anode plate for electrolysis. The anolyte is purified by extracting copper, oxidizing and neutralizing iron, extracting cobalt, chemically removing iron and lead, and performing deep copper removal, that is, after the anolyte passes the impurity removal. The liquid at this time is called catholyte, and the catholyte is then sent into the electrolytic cell to participate in the electrolysis reaction. figure 1 It is a schematic diagram of anolyte purification and impurity removal process. [0003] attached figure 1 In the process of electrolytic nickel production in the middle process, the copper concentration in the catholyte should be less than 0.001g / L, otherwise the copper content in the product will be greater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08C25C7/06C22B3/26C22B3/44
CPCY02P10/20
Inventor 赵瑞东于涛林立王长青徐洪坤李岩王刚赵彬李洪标腾维前冯春宇
Owner JILIN JIEN NICKEL IND
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