A method for removing chlorine from zinc sulfate solution

A zinc sulfate solution and solution technology, applied in the field of chlorine removal, can solve the problems of reduced dechlorination efficiency, low dechlorination efficiency, zinc loss, etc., and achieve the effect of improving chlorine removal efficiency, reducing chlorine removal cost, and improving removal rate

Active Publication Date: 2021-10-15
衡阳市大宇锌业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resin dechlorination method is used to remove chloride ions in zinc sulfate solution, which is theoretically perfect but the dechlorination efficiency is low; the alkali elution method is used to remove chloride ions in zinc sulfate solution, a large amount of zinc in the solution is lost, and the dechlorination efficiency is low; Using silver salt precipitation dechlorination method to remove chloride ions in zinc sulfate solution, although it can effectively remove chloride ions from the solution, but its cost is high
Using copper salt precipitation dechlorination method to remove chloride ions in zinc sulfate solution has the advantages of simple principle, convenient operation and low cost, but because cuprous chloride is very unstable, it is easily oxidized to divalent copper ions, making chloride ions And into the zinc sulfate solution, reducing the dechlorination efficiency

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  • A method for removing chlorine from zinc sulfate solution
  • A method for removing chlorine from zinc sulfate solution

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Embodiment 1

[0026] A kind of method for removing chlorine from zinc sulfate solution, its steps are: get 500mL zinc sulfate solution, add 10mol / L concentrated sulfuric acid to adjust pH, make solution pH be 3, wherein chloride ion concentration is 1g / L; Add 5 % ascorbic acid, then add 3g of copper sulfate, react for 40min, obtain the cuprous chloride precipitate and filter it; rinse the cuprous chloride precipitate with absolute ethanol, combine the washing solution and the filtrate to obtain a mixed solution; then add an equal volume of Chlorine in the mixed liquid is extracted by the extract after mixing dimethylamine and trimethylamine, wherein the extract is made of dimethylamine and trimethylamine at a volume ratio of 1:1, after extraction for 4 hours, stand and separate to obtain Chlorine-removing zinc sulfate solution and chlorine-rich organic phase; adding 2% sodium sulfate solution to the chlorine-rich organic phase to extract the chlorine in the chlorine-rich organic phase. Duri...

Embodiment 2

[0029] A kind of method for removing chlorine from zinc sulfate solution, its steps are: get 500mL zinc sulfate solution, add 20mol / L concentrated sulfuric acid to adjust pH, make solution pH be 1, wherein chloride ion concentration is 1g / L; Add 10 % ascorbic acid, then add 3g of copper sulfate, react for 60min, obtain the cuprous chloride precipitate and filter it; rinse the cuprous chloride precipitate with absolute ethanol, combine the washing liquid and the filtrate to obtain a mixed solution; then add an equal volume of Chlorine in the mixed liquid is extracted by the extract after mixing dimethylamine and n-butylamine, wherein the extract is made of dimethylamine and trimethylamine at a volume ratio of 1:1, after extraction for 6 hours, stand and separate to obtain Chlorine-removed zinc sulfate solution and chlorine-rich organic phase; add 5% sodium nitrate solution to the chlorine-rich organic phase to extract the chlorine in the chlorine-rich organic phase, the strippin...

Embodiment 3

[0032] A method for removing chlorine from zinc sulfate solution, the steps are: get 500mL zinc sulfate solution and add 15mol / L concentrated sulfuric acid to adjust the pH, so that the pH of the solution is 2, and wherein the chloride ion concentration is 1g / L; % ascorbic acid, then add 3g of copper sulfate, react for 50min, obtain the cuprous chloride precipitate and filter it; wash the cuprous chloride precipitate with absolute ethanol, combine the washing solution and the filtrate to obtain the mixed solution; then add an equal volume of Chlorine in the mixed liquid is extracted by the mixed extract of trimethylamine and n-butylamine, wherein the extract is made of dimethylamine and trimethylamine at a volume ratio of 1:1. After extraction for 5 hours, it is allowed to stand for stratification to remove Chlorine zinc sulfate solution and chlorine-rich organic phase; add 6% sodium nitrate solution to the chlorine-rich organic phase to strip the chlorine in the chlorine-rich ...

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Abstract

The invention discloses a method for removing chlorine from a zinc sulfate solution. The steps include: adding concentrated sulfuric acid to the zinc sulfate solution to adjust the pH; adding ascorbic acid, and then adding cuprous oxide for chlorine removal treatment to form cuprous chloride precipitates , after filtration, take the filtrate for later use; wash the cuprous chloride precipitate with absolute ethanol, combine the washing solution and the filtrate to obtain a mixed solution; add an equal volume of organic amine to the mixed solution, extract, and stand for stratification to obtain chlorine removal The zinc sulfate solution and the chlorine-rich organic phase; the chlorine-rich organic phase is back-extracted with a stripping agent to separate the chlorine and the organic phase. The method of the invention effectively removes chloride ions in the zinc sulfate solution, has high dechlorination efficiency, simple process, and reduces the cost of chlorine removal.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for removing chlorine from zinc sulfate solution. Background technique [0002] Recovery of zinc from zinc sulphate solutions usually occurs by electrolysis. Chloride ions are quite harmful substances in zinc electrolysis because they corrode the surface of the cathode causing problems when stripping the zinc sheet from the cathode, increasing energy consumption and reducing the quality of electrolytic zinc, so it is necessary to add Chlorine removal, thereby improving the quality of electrolytic zinc, reducing energy consumption and production costs. [0003] There are many methods for removing chloride ions in the prior art, mainly including resin dechlorination method, alkali elution chlorine method, silver salt precipitation dechlorination method, copper salt precipitation dechlorination method. The resin dechlorination method is used to remove chloride...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/20C25C1/16
CPCC22B19/26C25C1/16Y02P10/20
Inventor 颜昌军
Owner 衡阳市大宇锌业有限公司
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