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Method for simultaneously removing various impurity ions in zinc hydrometallurgy waste electrolyte

A technology of hydrometallurgy and waste electrolyte, which is applied in the field of non-ferrous metallurgy, can solve the problems of large waste slag and wastewater output, high cost, and unsatisfactory removal of impurity ions, etc., and achieves low output of intermediate waste slag, The effect of fast reaction speed and high removal efficiency of impurity ions

Active Publication Date: 2020-12-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large amount of heavy metal-containing gypsum slag and acidic wastewater are produced by using the lime neutralization method of waste electrolyte. The output of waste residue and wastewater is large and the cost is high. ionic needs

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  • Method for simultaneously removing various impurity ions in zinc hydrometallurgy waste electrolyte

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Effect test

Embodiment 1

[0030] A method for removing impurity ions in the waste electrolytic solution of wet zinc smelting, the specific steps are as follows:

[0031] (1) Heat exchange and pre-cooling: Take the waste electrolyte produced in the zinc electrolysis process of the wet zinc smelting plant. The physical and chemical properties of the electrolyte are: temperature 40°C, sulfuric acid concentration 180g / L, zinc ion concentration 45g / L, The lead ion concentration is 9.2mg / L, the calcium ion concentration is 45mg / L, the silicon dioxide concentration is 120mg / L, the fluoride ion concentration is 110mg / L, and the antimony ion concentration is 0.3mg / L. Put this spent electrolyte in 1m 3 The flow rate of / h is pumped into the tubular heat exchanger, and the calcium chloride solution with a temperature of -15°C is used as the refrigerant for heat exchange. .

[0032] (2) Crystallization and impurity removal: the pre-cooling liquid produced in step (1) was 3 The flow rate of / h is pumped into the...

Embodiment 2

[0036] A method for removing impurity ions in the waste electrolytic solution of wet zinc smelting, the specific steps are as follows:

[0037](1) Heat exchange and pre-cooling: Take the waste electrolyte produced in the zinc electrolysis process of the wet zinc smelting plant. The physical and chemical properties of the electrolyte are: temperature 38°C, sulfuric acid concentration 170g / L, zinc ion concentration 46g / L, The lead ion concentration is 7.5mg / L, the calcium ion concentration is 82mg / L, the silicon dioxide concentration is 110mg / L, the fluoride ion concentration is 152mg / L, and the antimony ion concentration is 0.36mg / L. Put this spent electrolyte in 1m 3 The flow rate of / h is pumped into the tubular heat exchanger, and the calcium chloride solution with a temperature of -20°C is used as the refrigerant for heat exchange. .

[0038] (2) Crystallization and impurity removal: the pre-cooling liquid produced in step (1) was 3 The flow rate of / h is pumped into the...

Embodiment 3

[0042] A method for removing impurity ions in the waste electrolytic solution of wet zinc smelting, the specific steps are as follows:

[0043] (1) Heat exchange and pre-cooling: Take the waste electrolyte produced in the zinc electrolysis process of the wet zinc smelting plant. The physical and chemical properties of the electrolyte are: temperature 37°C, sulfuric acid concentration 150g / L, zinc ion concentration 50g / L, The lead ion concentration is 6.3mg / L, the calcium ion concentration is 95mg / L, the silicon dioxide concentration is 135mg / L, the fluoride ion concentration is 95mg / L, and the antimony ion concentration is 0.35mg / L. Put this spent electrolyte in 1m 3 The flow rate of / h is pumped into the tubular heat exchanger, and the calcium chloride solution with a temperature of -15°C is used as the refrigerant for heat exchange. .

[0044] (2) Crystallization and impurity removal: the pre-cooling liquid produced in step (1) was 3 The flow rate of / h is pumped into the...

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Abstract

The invention relates to a method for simultaneously removing various impurity ions in a zinc hydrometallurgy waste electrolyte, and belongs to the field of nonferrous metallurgy. The zinc hydrometallurgy waste electrolyte is precooled through a heat exchanger, then the precooled solution is added to an impurity removal reaction kettle provided with a stirring device to be subjected to heat exchange and cooled to subzero 15 DEG C-0 DEG C, seed crystals are added in the cooling process for reaction for 20-60 min, impurity components such as lead, calcium, silicon, fluorine, antimony and the like in the solution are precipitated out in the form of a solid crystal product, after the reaction ends, the solid product containing the impurity components is quickly separated, and the electrolyte without impurities is obtained. According to the method, the impurities such as lead, calcium, silicon, fluorine, antimony and the like are simultaneously and directly separated from the waste electrolyte containing high-concentration sulfuric acid on the premise that main components of the zinc hydrometallurgy waste electrolyte are not changed, the electrolyte without the impurities meets the requirement of zinc electrolytic deposition impurity concentration, and the method has the advantages of short technological process, simplicity in operation, low reagent consumption, high impurity ion removal efficiency and the like.

Description

technical field [0001] The invention relates to a method for simultaneously removing multiple impurity ions in waste electrolytic solutions of hydrometallurgy, and belongs to the technical field of nonferrous metal metallurgy. Background technique [0002] At present, about 80% of zinc is produced by hydrometallurgical process. In the zinc electrodeposition process, the high concentration of impurity ions in the electrolyte will have a great adverse effect on the current efficiency, power loss and the quality of deposited zinc. . There are many impurity ions in the zinc hydrometallurgy electrolyte, among which common impurity ions such as copper, cadmium, nickel and cobalt are removed by zinc powder replacement and purification before the zinc electrolysis process, but lead, calcium, silicon, fluorine, antimony, etc. The impurity ions are enriched with the recycling of the waste electrolyte, which makes it difficult to remove these impurity ions in the electrolyte, which br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B19/20C25C1/16C25C7/06
CPCC22B19/30C22B19/26C25C1/16C25C7/06Y02P10/20
Inventor 李兴彬魏昶邓志敢李旻廷樊刚罗兴国
Owner KUNMING UNIV OF SCI & TECH
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