Method for removing chloride ions from zinc hydrometallurgy solution

A technology for zinc hydrometallurgy and chlorine removal, which is applied in the field of chlorine ion removal, can solve the problems of slow chlorine ion oxidation reaction speed, low chloride ion removal rate, and low chloride ion content, and achieves no complex equipment requirements, Low cost, good process matching effect

Inactive Publication Date: 2014-07-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can remove chloride ions in the solution to a certain extent, there are still many disadvantages, such as long process, high cost, low removal rate of chloride ions, etc., so that these methods cannot be applied in large-scale industrialization , the industry urgently needs a low-cost, high-efficiency method for removing chloride ions in solution
[0004] Checking the literature, no reports of oxidative dechlorination using strong oxidants have been found. This is because the composition of the hydrometallurgy zinc solution itself is complex and the content of chloride ions is not high. This feature makes the oxidation reaction of chloride ions slower.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Pump 8,000L of hydrometallurgy zinc leaching solution with a pH of 0.6 containing 1200mg / L of chloride ions and 112g / L of zinc into the reactor, start stirring, and raise the temperature to 60°C, and start the vacuum pump (2BV5-131 type water ring vacuum pump) And rinse tower circulation pump, then add 14.24Kg potassium permanganate in the solution, promptly control chloride ion and potassium permanganate molar ratio is 3: 1 (oxidant consumption is 1.7 times of theoretical consumption). After the feeding was completed, the insulation reaction was continued for 3 hours, and the reaction pressure was controlled to be 65Kpa during the reaction; after the dechlorination reaction was completed, the chloride ion content in the resulting solution was 82 mg / L, and the removal rate of chlorine was 93%.

Embodiment 2

[0032] Pump 8,000L of wet-process zinc leaching liquid containing 1500mg / L of chloride ions and 124g / L of zinc with a pH of 0.2 into the reaction kettle, start stirring, and raise the temperature to 35°C, and start the vacuum pump (2BV5-131 water ring vacuum pump) And rinse tower circulation pump, then add 20.32Kg permanganic acid in the solution, namely control chloride ion and permanganic acid molar ratio is 2: 1 (oxidant consumption is 2.5 times of theoretical consumption). Feeding is completed and the insulation reaction is continued for 1 hour. During the reaction, the reaction pressure is controlled to be 40Kpa; after the dechlorination reaction is completed, the chloride ion content in the resulting solution is 28 mg / L, and the removal rate of chlorine is 98%.

Embodiment 3

[0034] Pump 8000L of hydro-method zinc leaching liquid containing 1000mg / L of chloride ions and 80g / L of zinc with a pH of 0.15 into the reaction kettle, start stirring, and raise the temperature to 30°C, and start the vacuum pump (2BV5-131 type water ring vacuum pump) And rinse tower circulation pump, then add 16.56Kg potassium dichromate in the solution, promptly control chloride ion and potassium dichromate mol ratio is 4:1 (oxidant consumption is 1.5 times of theoretical consumption). After the feeding was completed, the insulation reaction was continued for 4.5 hours, and the reaction pressure was controlled to be 60Kpa during the reaction; after the dechlorination reaction was completed, the chloride ion content in the resulting solution was 85 mg / L, and the removal rate of chlorine was 92%.

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PUM

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Abstract

The invention relates to a method for removing chloride ions from a zinc hydrometallurgy solution, belonging to the field of non-ferrous metallurgy. The method comprises the steps of adding a strong oxidant to the zinc hydrometallurgy solution, oxidizing chloride ions in the solution to molecular chlorine, then placing the solution under negative pressure environment, and enabling molecular chlorine dissolved in the solution in the form of chlorine to be escaped rapidly from the zinc hydrometallurgy solution to achieve the purpose of removing chloride ions in the solution. The method disclosed by the invention has the advantages of simple process, no complex equipment requirements, low cost, good dechlorination effect and the like, and has good industrial application prospects.

Description

technical field [0001] The invention relates to a method for removing chloride ions from a zinc hydrometallurgy solution, belonging to the field of nonferrous metal metallurgy. technical background [0002] Since the 1980s, more than 80% of the global zinc production has been produced by the hydrometallurgy process, and this proportion is still growing. The hydrometallurgy process has become an inevitable trend of zinc metallurgy. The core of the zinc hydrometallurgy process is to obtain high-quality zinc sulfate solution. Therefore, purification and removal of impurities is one of the important links in the process, and the chloride ions in the zinc sulfate solution have an impact on the technical and economic indicators of the hydrometallurgy zinc smelter. very significant. Excessively high chloride ion content not only leads to severe corrosion of equipment, but also causes anode loss in the zinc electrowinning process and reduces the quality of cathode zinc. For this r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C01B7/01C22B19/20
CPCY02P10/20
Inventor 李玉虎刘志宏李启厚刘智勇刘付朋谭青谌伟
Owner CENT SOUTH UNIV
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