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Dechlorinating method

A technology for dechlorination and chloride ions, which is applied in the field of impurity removal, and can solve problems such as the inability to produce enough monovalent copper ions, the decline in dechlorination rate, and the inability to produce divalent copper ions

Inactive Publication Date: 2015-03-11
HUNAN SHUI KOU SHAN NONFERROUS METALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing copper slag dechlorination is to use the copper slag produced by the zinc system, which reduces the production cost to a certain extent, but the copper slag contains low copper grade and high other metal impurities. The whole process needs blasting or adding manganese powder Oxidation, but it is difficult to accurately control the length of blasting time or the amount of manganese powder added, and insufficient oxidation will not produce enough divalent copper ions, which will lead to insufficient production of monovalent copper ions, and excessive oxidation will lead to Cuprous chloride is redissolved, and the above two factors will cause the dechlorination rate to decrease
Therefore, the existing copper slag dechlorination technology process conditions are difficult to achieve accurate control, so the copper slag dechlorination technology is difficult to ensure high dechlorination rate

Method used

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  • Dechlorinating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Obtain copper-lead-zinc mixed ore oxygen pressure acid leaching solution 200ml (wherein Cu 2+ 34.08g / L, Zn 2+ 67.96g / L, Cl - 0.58g / L, H 2 SO 4 40.68g / L), to which 16.4g of zinc oxide was added, and the pickling solution was neutralized to a pH of 2.5, and the Cl in the obtained neutralized solution - The concentration is 0.61g / L, Cu 2+ The concentration is 32.41g / L; 5.55g of iron powder is added to 150ml of neutralized liquid, and filtered after reaction to obtain 6.06g of copper cotton; 50ml of neutralized liquid and a zinc solution with a chloride ion content of 0.98g / L 500ml mixed, then add sulfuric acid solution to obtain a mixed solution, the concentration of sulfuric acid in the mixed solution is 8g / L; finally add 4.34g copper cotton, after the reaction, Cl in the obtained dechlorinated liquid - The content of the content is 0.092g / L, and the Cl in the chlorine removal residue - The content of chlorine is 6.88%, after calculation, the removal rate of chlorin...

Embodiment 2

[0036] Obtain copper-lead-zinc mixed ore oxygen pressure acid leaching solution 200ml (wherein Cu 2+ 34.08g / L, Zn 2+ 67.96g / L, Cl - 0.58g / L, H 2 SO 4 40.68g / L), to which 15.8g of zinc oxide was added, and the pickling solution was neutralized to a pH of 2.0, and the Cl in the obtained neutralized solution - The concentration is 0.58g / L, Cu 2+ The concentration is 33.26g / L; 6.0g of iron powder is added to 150ml of neutralized liquid, and filtered after reaction to obtain 6.49g of copper cotton; Solution 500ml is mixed, add sulfuric acid solution again, obtain mixed solution, the concentration of sulfuric acid in the mixed solution is 8.4g / L; Finally add 4.5g copper cotton, after reaction, the Cl in the liquid after dechlorination obtained - The content of the content is 0.085g / L, the Cl in the dechlorination residue - The content of chlorine is 6.30%, after calculation, the removal rate of chlorine is 91.02%.

Embodiment 3

[0038] Obtain copper-lead-zinc mixed ore oxygen pressure acid leaching solution 200ml (wherein Cu 2+ 34.08g / L, Zn 2+ 67.96g / L, Cl - 0.58g / L, H 2 SO 4 40.68g / L), to which 17.5g of zinc oxide was added, and the pickling solution was neutralized to a pH of 3.0, and the Cl in the obtained neutralized solution - The concentration is 0.64g / L, Cu 2+ The concentration is 33.43g / L; 6.5g of iron powder is added to 150ml of neutralized liquid, and filtered after reaction to obtain 6.28g of copper cotton; Solution 500ml is mixed, then add sulfuric acid solution, obtain mixed solution, the concentration of sulfuric acid in the mixed solution is 9g / L; Finally add 4.7g copper wool, after reaction, the Cl in the liquid after dechlorination obtained - The content of the content is 0.084g / L, and the Cl in the chlorine removal residue - The content of chlorine is 8.65%, after calculation, the removal rate of chlorine is 91.12%.

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Abstract

The invention provides a dechlorinating method comprising the following steps of (A) neutralizing an oxygen pressure acid-leaching solution of a copper-lead-zinc bulk concentrate to obtain a neutralized solution; (B) mixing a first mass part of neutralized solution and one of iron powder and zinc powder, and reacting to obtain copper sponge; and (C) mixing a second mass part of neutralized solution, the copper sponge and a zinc solution, and reacting to obtain a dechlorinated solution, wherein the zinc solution contains chloride ions. According to the dechlorinating method, the oxygen pressure acid-leaching solution of the copper-lead-zinc bulk concentrate is used as the raw material; the neutralized solution of a copper-containing byproduct obtained from the oxygen pressure acid-leaching solution of the copper-lead-zinc bulk concentrate is subjected to comproportionation with the copper sponge so that chloride ions in a zinc system solution are removed; the self-feed of dechlorinating raw materials is realized; and the dechlorinating method is simple in process and high in dechlorinating rate.

Description

technical field [0001] The invention relates to the technical field of impurity removal, in particular to a chlorine removal method. Background technique [0002] Zinc calcined sand, sub-zinc oxide, soot, zinc dross and other raw materials used in zinc hydrometallurgy all contain impurity chlorine. After L, the consumption of the cathode plate will increase rapidly, the power consumption will increase, the quality of the electrolytic zinc will decrease, and the production cost will be increased. [0003] At present, the methods for removing chloride ions from zinc solution include ion exchange method, silver chloride precipitation method and copper slag dechlorination method. Among them, the ion exchange method means that chloride ions are weakly adsorbable anions, so dilute sulfuric acid can be used as a desorbent and transformation agent to adsorb and desorb chloride ions. The silver chloride precipitation method is to add silver salt to the zinc sulfate solution, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B7/00C22B15/00
CPCY02P10/20
Inventor 付绸琳何从行谭振华李冬元付高明陈国兰钟雄
Owner HUNAN SHUI KOU SHAN NONFERROUS METALS GRP