Method for removing chlorine from zinc electrolyte

A zinc electrolyte and chlorine content technology, applied in the field of zinc electrolysis, can solve the problems of difficult control, secondary pollution, high cost, etc., and achieve the effects of easy operation, low cost, and easy availability of raw materials

Inactive Publication Date: 2020-12-15
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for removing chlorine from zinc elect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, a kind of method for removing chlorine from zinc electrolyte, it may further comprise the steps:

[0023] Bismuth oxycarbonate preparation: bismuth citrate is dissolved in the ammoniacal liquor of 5% by mass concentration, stirs to make it dissolve completely, then adds sodium carbonate (Na 2 CO 3 ) solution, a white precipitate can be seen, filtered after 12 hours of reaction, washed with absolute ethanol and distilled water three times in sequence, and the product was dried at 50°C for 6 hours to obtain bismuth oxycarbonate to prepare the product;

[0024] Preparation of bismuth subsulphate monohydrate: Bi 2 o 2 CO 3 Added to sulfuric acid solution, Bi 2 o 2 CO 3 The amount of addition is 1 time of the theoretical mass of bismuth calculated according to the amount of chlorine, Bi 2 o 2 CO 3 The molar ratio with sulfuric acid is 1:3, and the reaction is stirred at 50°C for 5 hours, and the pH of the system is adjusted to about 2 with sodium hydro...

Embodiment 2

[0026] Embodiment 2, a kind of method for removing chlorine from zinc electrolyte, it may further comprise the steps:

[0027] The preparation of bismuth oxycarbonate: bismuth citrate is dissolved in the ammoniacal liquor of 5% by mass concentration, stirs to make it dissolve completely, then adds sodium carbonate (Na 2 CO 3 ) solution, a white precipitate can be seen, filtered after reacting for 15 hours, washed with absolute ethanol and distilled water three times in sequence, and the product was dried at 70° C. for 5 hours to obtain bismuth oxycarbonate to prepare the product;

[0028] Preparation of bismuth subsulphate monohydrate: Bi 2 o 2 CO 3 Added to sulfuric acid solution, Bi 2 o 2 CO 3 The addition amount is 1.5 times of the theoretical mass of bismuth calculated by the amount of chlorine, Bi 2 o 2 CO 3 The molar ratio with sulfuric acid is 1:3.2, and the reaction is stirred at 50°C for 5 hours. During the reaction, the pH of the system is adjusted to about ...

Embodiment 3

[0030] Embodiment 3, a kind of method for removing chlorine from zinc electrolyte, it may further comprise the steps:

[0031] The preparation of bismuth oxycarbonate: bismuth citrate is dissolved in the ammoniacal liquor of 5% by mass concentration, stirs to make it dissolve completely, then adds sodium carbonate (Na 2 CO 3 ) solution, a white precipitate can be seen, filtered after reacting for 18 hours, washed with absolute ethanol and distilled water three times in sequence, and the product was dried at 80° C. for 4 hours to obtain bismuth oxycarbonate to prepare the product;

[0032] Preparation of bismuth subsulphate monohydrate: Bi 2 o 2 CO 3 Added to sulfuric acid solution, Bi 2 o 2 CO 3 The amount of addition is 1.8 times the theoretical mass of bismuth based on the amount of chlorine, Bi 2 o 2 CO 3 The molar ratio with sulfuric acid is 1:3.5, stirred and reacted at 60°C for 3 hours, and the pH of the system was adjusted to about 3 with basic zinc sulfate dur...

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PUM

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Abstract

The invention discloses a method for removing chlorine from a zinc electrolyte, and belongs to the field of zinc electrolysis. The problems of difficulty in control, high cost and secondary pollutionin an existing method are solved. The method comprises the following steps: bismuthyl carbonate is added into a sulfuric acid solution, the adding amount of the bismuthyl carbonate is 1-2 times of bismuth theoretical mass calculated according to the chlorine amount, a pH value of a system is adjusted to be 2-4 by using alkali, precipitates formed by reaction are gradually converted from yellow solid particles into white flocculent precipitate bismuth sulfate monohydrate, and filtering is conducted; and a wet slag filtered in the step 1 is added into the zinc electrolyte, stirring and reactingare conducted for 1-5h at room temperature, and then filtering is conducted. According to the method, the removal rate of chlorine in the electrolyte is 93% or above, the concentration of chloride ions in the treated zinc sulfate electrolyte is lower than 0.3 g/L, and residual trace chloride ions cannot influence a system. The method is easy to operate, process parameters are easy to control, rawmaterials are easy to obtain, the cost is low, and new environmental pollution and other problems cannot be caused.

Description

technical field [0001] The invention belongs to the field of zinc electrolysis, in particular to a method for removing chlorine from zinc electrolyte. Background technique [0002] Chlorine is a relatively harmful element in the zinc hydrometallurgy system. When the chlorine content is high, it will corrode the cathode and anode plates in electrolysis, shorten the service life of the cathode and anode plates, cause difficulty in zinc stripping and increase power consumption, and also seriously corrode equipment . When chlorine corrodes the anode plate, it will also lead to an increase in the lead content in the electrolyte. When the lead content in the electrolyte exceeds 5mg / L, it will directly affect the quality of the cathode zinc sheet. In addition, when the chlorine content in the electrolyte is high, the chlorine gas produced will deteriorate the operating environment and affect the health of the operators. Therefore, it is necessary to control the concentration of c...

Claims

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Application Information

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IPC IPC(8): C25C1/16C01G29/00
CPCC01G29/00C25C1/16Y02P10/20
Inventor 彭涛嘉王军后洁琼臧佳克
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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