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Method for cleaning copper electrolyte to remove impurities

A copper electrolyte, purification and impurity removal technology, applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc., can solve the problems of high fire refining requirements, side effects of electrolyte, poor purification effect, etc., and achieve the effect of impurity removal Good, the effect of improving economic benefits and reducing the amount of copper

Inactive Publication Date: 2016-11-09
紫金铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have different degrees of low impurity removal efficiency, large fixed investment, and certain side effects on the electrolyte.
[0004] Some people have also studied the method of using the purification ability of the electrolyte itself to promote the removal of impurities: adding high-arsenic solution or arsenic salt to the electrolyte to make arsenic, antimony and bismuth co-precipitate into the anode slime; The effect is obvious, but as time goes on, the purification effect becomes worse
Some people increase the concentration of As in the electrolyte by controlling the relative mass ratio of Sb / Bi in the anode plate, reduce the As(Ⅲ) / As(Ⅴ) concentration ratio, and speed up the formation of arsenic antimonate by As, Sb and Bi. To achieve the purpose of purifying the electrolyte; although the method is simple in process, consumes less reagents, and has no side effects on the electrolysis process, it has high requirements for fire refining and is difficult to implement

Method used

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  • Method for cleaning copper electrolyte to remove impurities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The treated copper electrolytic waste liquid in this example contains Cu: 43.5 g / L, As: 15.8 g / L, Sb: 655 mg / L, and Bi: 579 mg / L. The treatment process and effect are as follows:

[0030] (1) The molar mass m(Bi):m(As)=1.5:1 Calculate the amount of bismuth-containing precipitation to be added, and add it to the corresponding volume of electrolyte at a temperature of 60℃, and stir for 40min. The precipitation rates of arsenic, antimony and bismuth are 98%, 75% and 61% respectively.

[0031] (2) Alkaline leaching regeneration with bismuth-containing precipitation agent, sodium hydroxide mass concentration 60g / L, volume-mass ratio of alkaline leaching solution and co-precipitate is 5:1 (ml / g), temperature 80℃; time 1.5h. The leaching rate of arsenic is 98%, and antimony and bismuth are basically not leached.

[0032] (3) Electrodecopperize the purified liquid in the electrowinning tank, the electrolyte flow rate is 2m 3 / h. Current density of the first stage 250A / m 2 , The cop...

Embodiment 2

[0034] The treated copper electrolytic waste liquid in this example contains Cu: 43.5 g / L, As: 15.8 g / L, Sb: 655 mg / L, and Bi: 579 mg / L. The treatment process and effect are as follows:

[0035] (1) Mass of mole m(Bi):m(As)=0.8:1 Calculate the amount of bismuth-containing precipitate to be added, and add it to the corresponding volume of electrolyte at a temperature of 70°C and stir for 1h. The precipitation rates of arsenic, antimony and bismuth are 85%, 73% and 69% respectively.

[0036] (2) Alkaline leaching regeneration of bismuth-containing precipitant, sodium hydroxide mass concentration 80g / L, volume-mass ratio of alkaline leaching solution and co-precipitate is 3:1 (ml / g), temperature 75℃; time 2h. The leaching rate of arsenic is 96%, and antimony and bismuth are basically not leached.

[0037] (3) Electrodecopperize the purified liquid in the electrowinning tank, the electrolyte flow rate is 2.2m 3 / h. The first stage current density 260A / m 2 , The copper ion concentratio...

Embodiment 3

[0039] The treated copper electrolytic waste liquid in this example contains Cu: 43.5 g / L, As: 15.8 g / L, Sb: 655 mg / L, and Bi: 579 mg / L. The treatment process and effect are as follows:

[0040] (1) The molar mass m(Bi):m(As)=2:1 Calculate the amount of bismuth-containing precipitate to be added, and add it to the corresponding volume of electrolyte at a temperature of 50°C and stir for 15min. The precipitation rates of arsenic, antimony and bismuth are 99%, 76% and 52% respectively.

[0041] (2) Alkaline leaching regeneration with bismuth-containing precipitant, sodium hydroxide mass concentration 20g / L, volume mass ratio of alkaline leaching solution and co-precipitate is 8:1 (ml / g), temperature 90℃; time 30min. The leaching rate of arsenic is 95%, and antimony and bismuth are basically not leached.

[0042] (3) Electrodecoppering the purified liquid in the electrowinning tank, the electrolyte flow rate is 2.6m 3 / h. Current density of the first stage 220A / m 2 , The copper ion c...

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Abstract

The present invention discloses a method for cleaning copper electrolyte to remove impurities; first, bismuth salt is used as a chemical precipitator to remove arsenic, antimony and bismuth in the electrode by co-precipitation, and solid-liquid separation is carried out; second, the obtained solid precipitate is subjected to precipitator alkali-soaking regeneration by using sodium hydroxide; third, the obtained impurity-removed liquid is subjected to segmental electrodeposition copper removal by using insoluble lead as an anode and stainless as a cathode, and a post-copper removal liquid is returned to an electrolytic system. The method has the advantages of low investment, good process simplicity, good operational convenience, good impurity removal effect and zero pollution, efficient and low-cost removal of the impurities such as arsenic, antimony and bismuth in open circuit electrolyte is achieved, and copper recycling and electrolytic waste liquid purification and reuse are achieved.

Description

Technical field [0001] The invention relates to a non-ferrous metal hydrometallurgical resource recycling technology, in particular to a method for purifying and removing impurities from a copper electrolyte. Background technique [0002] During the copper electrolysis process, some impurities such as arsenic, antimony, and bismuth in the anode plate will chemically dissolve into the electrolyte together. Since the precipitation potential of these impurities is similar to that of copper, when arsenic, antimony, and bismuth in the electrolyte accumulate to a certain level, they will precipitate together with copper on the cathode, thereby affecting the quality of the cathode product. Therefore, in order to ensure the normal progress of the copper electrolysis process, the electrolyte needs to be open-circuited and purified in time. The traditional process of copper electrolyte purification is as follows: firstly, open the electrolyte to evaporate and crystallize to prepare copper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C25C7/06C22B7/00C22B30/00
CPCC22B7/008C22B30/00C25C1/12C25C7/06Y02P10/20
Inventor 张焕然衷水平林泓富吴健辉王俊娥廖元杭陈杭苏秀珠刘晓英熊家春
Owner 紫金铜业有限公司
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