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A kind of circulation evaporation crystallization separation method of zinc and magnesium in zinc electrolyte

A technology of evaporative crystallization and zinc electrolyte, applied in the field of electrolytic zinc, can solve the problems of secondary pollution, difficult waste water, low resource recycling rate, etc., and achieve the goals of saving additive costs, reducing power consumption, and good economic and social benefits Effect

Active Publication Date: 2017-04-05
YUNNAN YUQI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple and easy to implement, there are still the following problems in direct neutralization: ① Due to the high concentration of acid in the waste liquid, a large amount of calcium hydroxide needs to be added for neutralization, which will generate a large amount of waste residue, and is also harmful to acid resources. ②, sulfide is added in the precipitation process, and the generated hydrogen sulfide is easy to cause secondary pollution after being discharged, and the investment cost of the later discharge treatment is relatively high; ③, the recovery and utilization cost of zinc in the generated slag is high, and it is difficult to directly recycle the waste water Need to discharge, high production cost of enterprises, low recycling rate of resources

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  • A kind of circulation evaporation crystallization separation method of zinc and magnesium in zinc electrolyte

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Embodiment 1

[0012] Get 1000L zinc sulfate content and be 120g / L, the electrolytic zinc solution that magnesium sulfate content is 50g / L, separate by the method for the present invention.

[0013] The first step: Zinc sulfate concentrated crystallization. The electrolytic zinc solution is transported to the zinc sulfate evaporation and concentration system by a circulating pump for evaporation and concentration. The working temperature of the evaporation and concentration system is 80°C and the working pressure is 0.3MPa; during the concentration process, the water in the zinc solution is continuously evaporated, and the zinc sulfate is A large number of crystals are precipitated. When the concentration of the zinc liquid reaches 60%, the resulting thick slurry is separated from the solid and liquid to obtain 103g of zinc sulfate crystals and centrifuged liquid; the obtained zinc sulfate crystals are dissolved to 70-80g / The concentration of L returns to the zinc electrolysis section, and ...

Embodiment 2

[0018] Get 1000L zinc sulfate content and be 120g / L, the electrolytic zinc solution that magnesium sulfate content is 50g / L, separate by the method for the present invention.

[0019] The first step: Zinc sulfate concentrated crystallization. The electrolytic zinc solution is transported to the zinc sulfate single-effect evaporation and concentration system with a circulating pump for evaporation and concentration. The working temperature of the single-effect evaporation and concentration system is 100°C and the working pressure is 0.2MPa; during the concentration process, the water in the zinc solution is continuously evaporated , a large amount of zinc sulfate is precipitated in the form of crystals. When the concentration of the zinc liquid reaches 60%, the thick slurry is first sent to the hydrocyclone thickener for preliminary solid-liquid separation, and then sent to the centrifuge for separation to obtain 108g of zinc sulfate crystals and centrifuged clear liquid; the o...

Embodiment 3

[0024] Get 1000L zinc sulfate content and be 120g / L, the electrolytic zinc solution that magnesium sulfate content is 50g / L, separate by the method for the present invention.

[0025] The first step: Zinc sulfate concentrated crystallization. The electrolytic zinc solution is transported to the zinc sulfate single-effect evaporation and concentration system with a circulating pump for evaporation and concentration. The working temperature of the single-effect evaporation and concentration system is 120°C and the working pressure is 0.1MPa; during the concentration process, the water in the zinc solution is continuously evaporated , a large amount of zinc sulfate is precipitated in the form of crystals. When the concentration of the zinc liquid reaches 60%, the thick slurry is first sent to the hydrocyclone thickener for preliminary solid-liquid separation, and then sent to the centrifuge for separation to obtain 105g of zinc sulfate crystals and centrifuged clear liquid; the o...

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Abstract

The invention discloses a circulating evaporation-crystallization-separation method for zinc and magnesium in zinc electrolyte. The circulating evaporation-crystallization-separation method comprises the steps of concentration and crystallization of zinc sulfate, secondary separation, crystal separation of magnesium sulfate, and the like. According to the circulating evaporation-crystallization-separation method, by virtue of a pure physical process in which circulating evaporation is combined with fractional crystallization, no any impurity is introduced into the whole production process, wastewater and waste residues are not discharged, and the wastewater is completely recycled and is not drained outwards; no any waste residue is discharged, so that the cost of an additive consumed by virtue of a traditional neutralization precipitation method as well as environmental protection costs generated during the treatment and draining of the wastewater and the waste residues are saved, and the power consumption can be effectively reduced; besides, condensed water in an evaporation concentration process can be recycled, no any crystallization phenomenon exists in pipelines, and the separated magnesium sulfate and zinc sulfate can be directly applied to industrial production, so that the reasonable utilization and the maximum benefit of enterprise resources are completely achieved, and the economic and social benefits are excellent.

Description

technical field [0001] The invention belongs to the technical field of electrolytic zinc in the hydrometallurgy industry, and in particular relates to a method for cyclic evaporation crystallization and separation of zinc and magnesium in a zinc electrolytic solution. Background technique [0002] In the zinc electrolysis production process, the raw material zinc ore will inevitably contain lead, nickel, copper, magnesium and other impurity metals, which have a great impact on the quality of electrolytic zinc, and the magnesium element in the zinc solution will seriously affect the current efficiency during electrolysis And the purity of electrolytic zinc products. As the electrolysis process continues, the zinc content in the electrolyte will continue to decrease, and the sulfuric acid content will continue to increase. In order to maintain the stability of the electrolysis conditions, it is necessary to extract a part of the waste liquid from the electrolysis and return it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/16C25C7/06
CPCC25C1/16C25C7/06Y02P10/20
Inventor 岳峰吴玄斌赵怡何振华何双力费怀道
Owner YUNNAN YUQI ENVIRONMENTAL PROTECTION TECH CO LTD