Method for purifying copper electrolyte by using chemical reduction method

A copper electrolyte, electrolyte technology, applied in the direction of optics, improvement of process efficiency, photographic technology, etc., can solve the problems of large amount of precipitant, complicated operation, high tank voltage, etc., achieve good impurity removal effect, simple process, and tank The effect of high voltage

Inactive Publication Date: 2010-06-02
郑雅杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology of electrowinning to purify copper electrolyte is mature, and the effect of removing Cu and As, Sb and Bi is good, but the obvious disadvantages are ① use of insoluble anode, high cell voltage, and high energy consumption; ② highly toxic arsine is precipitated; ③ contains arsenic , antimony, and bismuth black copper needs to be returned to smelting, resulting in the circulation and accumulation of arsenic, antimony, and bismuth impurities
Its disadvantage is that the resin exchange capacity is limited, and the Cl produced by the analysis - Contamination of electrolyte and other issues
The d

Method used

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  • Method for purifying copper electrolyte by using chemical reduction method
  • Method for purifying copper electrolyte by using chemical reduction method
  • Method for purifying copper electrolyte by using chemical reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] In 1000mL decopper electrolyte, the composition of the decopper electrolyte is shown in Table 1, add 50mL hydrazine hydrate under stirring, when the reaction temperature is 42°C, filter after 60min, the removal rates of copper, arsenic, antimony and bismuth are respectively It is 97.04%, 5.28%, 37.92%, 94.40%. After filtration, the electrolyte returns to the electrolytic cell.

[0008] Table 1 Composition of decopper electrolyte g / L -1

[0009]

Embodiment 2

[0011] In 1000mL decopper electrolyte, the composition of decopper electrolyte is shown in Table 1, add 50mL hydrazine hydrate and 50mL concentrated hydrochloric acid (AR) under stirring, when the reaction temperature is 42°C, filter after 60min, copper, arsenic, The removal rates of antimony and bismuth are 98.77%, 19.04%, 21.76%, and 47%, respectively, and the electrolyte is returned to the electrolytic cell after filtration.

Embodiment 3

[0013] In 2000mL copper electrolyte, the composition of copper electrolyte is shown in Table 2. Sulfur dioxide is introduced at a flow rate of 600mL / min. After reduction to 4h at a reaction temperature of 65°C, the composition of copper electrolyte is evaporated by heating, crystallized by cooling and filtered. As shown in Table 3, the filtered electrolyte was returned to the electrolyzer.

[0014] Table 2 Composition of copper electrolyte / g L -1

[0015]

[0016] Table 3 Composition of copper electrolyte after purification by sulfur dioxide reduction, evaporation and crystallization / g L -1

[0017]

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PUM

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Abstract

The invention provides a method for purifying a copper electrolyte by using a chemical reduction method. The method comprises the following steps of adding reducing agents comprising hydrazine hydrate, sulfur dioxide and the like, and a compound which contains Cl-irons, Br-irons and I-irons and is used as additives in the copper electrolyte, filtering after the reduction reaction, or evaporating and crystallizing copper sulfate and filtering to obtain the purified electrolyte, and adding the purified electrolyte in an electrolytic bath to return to an electrolyzing system. Adopting the chemical reduction method to purify the electrolyte, the invention eliminates black copper powder and arsenide hydrogen generated in an electro-deposition method and greatly reduces the energy consumption during purifying the copper electrolyte.

Description

Technical field: [0001] The invention relates to a method for purifying copper electrolyte, which is to add a suitable reducing agent into the copper electrolyte, mainly to make As(V) in the copper electrolyte be reduced and co-precipitate with impurity elements Sb and Bi in the electrolyte Purify the copper electrolyte. Background technique: [0002] In the electrolytic refining of copper, the anode efficiency is higher than the cathode efficiency, and Cu 2+ As the concentration increases, so does the impurity concentration. In order to ensure the quality of cathode copper and maintain normal production, the copper electrolyte must be purified. Purification purpose of copper electrolyte (1) Copper removal, generally with CuSO 4 ·5H 2 O or standard cathode copper is removed; (2) In addition to As, Sb, Bi, many methods are used, and electrowinning is widely used; (3) Ni is recovered, usually by concentrated evaporation to remove Cu and remove As, and nickel sulfate is rec...

Claims

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Application Information

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IPC IPC(8): C25C1/12
CPCY02P10/20
Inventor 郑雅杰
Owner 郑雅杰
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