Method for removing bismuth from copper electrolyte

A copper electrolyte and solution technology, applied in the field of removing bismuth from copper electrolyte, can solve problems such as substandard quality of electric copper, and achieve the effect of high-efficiency impurity removal capability and good bismuth removal effect.

Inactive Publication Date: 2018-12-18
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the bismuth content in the electrolyte reaches 0.6 g / L, and the copper concentration in the electrowinning process is lower than 9 g / L, the bismuth discharge is obviously precipitated, so that the quality of the electrolytic copper obtained in the later stage is not up to standard.

Method used

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  • Method for removing bismuth from copper electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix antimony pentoxide with hydrogen peroxide solution, the amount of hydrogen peroxide is 6 times of the molar amount of antimony. Under the condition of stirring, react at 80°C for 50 minutes to obtain active bismuth removing agent slurry. Take 4 L of copper electrolyte with a bismuth concentration of 0.92 g / L, heat it to 100 °C with stirring, and add an active bismuth removal agent. The molar amount of antimony in the active bismuth removal agent is 7 times that of bismuth in the copper electrolyte, maintaining The reaction was stirred at 100°C for 2 hours. The antimony-bismuth slag and purified liquid were obtained by filtration, and the bismuth content of the purified liquid was reduced to 0.15 g / L. Stir the antimony-bismuth slag with 200 mL of acidic chloride salt solution to carry out the operation of removing bismuth by chloride salt. The pH value of the acidic chloride salt solution is 0.5, the concentration of sodium chloride is 150 g / L, and the reaction temp...

Embodiment 2

[0019] Mix antimony acid with hydrogen peroxide solution, and the amount of hydrogen peroxide is 5 times the molar amount of antimony. Under the condition of stirring, react at 95°C for 10 minutes to obtain active bismuth removing agent slurry. Take 4 L of copper electrolyte with a bismuth concentration of 0.83 g / L, heat it to 85 °C with stirring, and add an active bismuth removal agent. The molar amount of antimony in the active bismuth removal agent is 10 times the molar amount of bismuth in the copper electrolyte. The reaction was stirred at 85°C for 0.5 hours. The antimony-bismuth slag and purified liquid were obtained by filtration, and the bismuth content of the purified liquid was reduced to 0.09g / L. The antimony-bismuth slag was stirred and mixed with 200 mL of acid chloride salt solution to carry out the operation of removing bismuth from chloride salt. The pH value of the acid chloride salt solution was 1.0, the concentration of sodium chloride was 218 g / L, and the ...

Embodiment 3

[0024] The hydrogen peroxide solution is added to the mixture of sodium antimonate and potassium pyroantimonate, and the amount of hydrogen peroxide is 3 times of the molar amount of antimony. Under the condition of stirring, react at 50°C for 30 minutes to obtain active bismuth removing agent slurry. Take 4 L of copper electrolyte with a bismuth concentration of 1.17 g / L, heat it to 60 °C with stirring, and add an active bismuth removal agent. The molar amount of antimony in the active bismuth removal agent is 5 times that of bismuth in the copper electrolyte. The reaction was stirred at 60°C for 2 hours. Antimony-bismuth slag and purified liquid were obtained by filtration, and the bismuth content of the purified liquid was reduced to 0.26 g / L. The antimony-bismuth slag was stirred and mixed with 200 mL of acidic chloride salt solution to carry out the operation of removing bismuth by chloride salt. The pH value of the acid chloride salt solution was 0.5, the concentration ...

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Abstract

The invention discloses a method for removing bismuth from a copper electrolyte. The method comprises the specific steps that active bismuth remover is obtained by stirring and mixing antimony-containing compounds or antimony residues with a hydrogen peroxide solution for activating treatment operation, then the active bismuth remover is stirred and mixed with a bismuth-containing copper electrolyte for purification and bismuth removal operations, bismuth is selectively removed from the copper electrolyte, and purified liquid and antimony bismuth residues are obtained; the antimony bismuth residues and an acid chloride solution are stirred and mixed to be subjected to chloride bismuth removal operation, the bismuth in the antimony bismuth residue is selectively leached, and a bismuth-containing acid chloride solution and antimony residues are obtained after solid-liquid separation; and the bismuth-containing acid chloride solution is subjected to neutralization and bismuth sinking to return to the chloride bismuth removal process. The method for removing the bismuth from the copper electrolyte can enable the removal rate of bismuth in the copper electrolyte to reach up to more than95%, copper and nickel of the copper electrolyte after bismuth removal have almost no loss, and the residue of antimony has not increased significantly. Bismuth is enriched in the form of bismuth oxychloride and discharged from an electrolysis system, and the antimony residues still have a better bismuth removal effect after being subjected to hydrogen oxide activation treatment in the process ofrecycling.

Description

technical field [0001] The invention relates to a method for purifying and removing impurities from a solution, in particular to a method for removing bismuth from a copper electrolyte. Background technique [0002] Bismuth is a common associated element of copper minerals. Because the potential of bismuth is similar to that of copper, it is easy to discharge and precipitate simultaneously with copper at the cathode, and it is also easy to form floating anode slime with arsenic and antimony to adhere to the cathode, making it the most harmful impurity element to the quality of copper. At present, although there are researches on bismuth removal technologies such as solvent extraction, ion exchange, and self-purification, copper smelting companies still widely use electrowinning to co-precipitate arsenic, antimony, bismuth and copper in the form of black copper. Although the electrowinning method can open arsenic, antimony, and bismuth out of the electrolytic system, black c...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B15/00C25C1/12C25C7/06
CPCC22B3/44C22B15/0089C25C1/12C25C7/06Y02P10/20
Inventor 曹才放吴艳新徐志峰王拥军杨亮张喆秋刘素红夏胜文赵体茂
Owner JIANGXI UNIV OF SCI & TECH
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