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Method for removing fluorine in wet-method zinc smelting process

A technology of hydrometallurgy and zinc removal, applied in the field of chemical industry

Active Publication Date: 2018-12-11
云南永昌铅锌股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In short, the existing technologies for removing fluoride and chloride ions in zinc sulfate solution still have various deficiencies or limitations, and the technology for removing fluoride in zinc sulfate solution needs to be further improved.

Method used

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  • Method for removing fluorine in wet-method zinc smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Defluoridation Treatment of Acidic Zinc Sulfate Leaching Solution Using Aluminum Plate

[0037] The acidic zinc sulfate leaching solution is passed through the concentration pool for defluoridation treatment, and the acidic zinc sulfate leaching solution is contacted with the aluminum plate during the treatment process to form aluminum fluoride precipitation. Among them, the chloride ion content in the acidic zinc sulfate leaching solution is 1051.5 mg / L, the fluoride ion content is 126.3 mg / L, and the sulfuric acid content is 20 g / L. The ratio of the surface area of ​​the aluminum plate immersed in the acidic zinc sulfate leaching solution to the volume of the zinc sulfate leaching solution is 10cm 2 / L, the contact time between the acidic zinc sulfate leaching solution and the aluminum plate is 17.5h, the reaction temperature is 65°C, the fluoride ion concentration in the concentrated solution is 108mg / L, and the defluorination rate of the acidic zinc sulfate leaching...

Embodiment 2

[0039] Aluminum shavings and aluminum plates are used to defluorinate zinc electrowinning waste liquid.

[0040] Pass the zinc electrowinning waste liquid generated during the zinc electrowinning process into the waste liquid storage tank, add aluminum scraps to the zinc electrowinning waste liquid for soaking, and at the same time hang an aluminum plate on the upper part of the waste liquid storage tank and immerse in the zinc electrowinning waste liquid In contact with the waste liquid, it reacts to form aluminum fluoride precipitation, and finally obtains the waste liquid for defluorination; among them, the Cl in the waste liquid - The content is 1200-1600mg / L, the content of sulfuric acid is 150-180g / L, the particle size of aluminum chips is 1cm, the volume ratio of aluminum chips to electrowinning waste liquid is 0.5, the soaking time is 5h, and the soaking temperature is 35°C; The ratio of the surface area of ​​the aluminum plate immersed in the soaking liquid to the vol...

Embodiment 3

[0045] The aluminum plate is used to defluoride the acidic zinc sulfate solution.

[0046] Take acidic zinc sulfate leaching solution containing 224.1mg / L of fluorine, 926.45mg / L of chlorine and 70.58g / L of zinc for defluorination treatment. Take 5L of zinc sulfate leaching solution and raise the temperature to 40°C, put a certain amount of waste aluminum plate into the solution, the volume ratio of the surface area of ​​waste aluminum plate to zinc sulfate leaching solution is 50cm 2 / L, put it statically for 24 hours, so that the fluoride ions can fully react with the aluminum plate in the presence of chloride ions to form a precipitate; filter through a vacuum filter, the volume of the filtrate is 4.995L, and the fluorine content is 80.67mg / L. Zinc 70.49g / L, fluorine removal rate 64.04%, zinc loss rate 0.23%.

[0047] The experimental results show that the defluoridation treatment of zinc sulfate leaching solution by using waste aluminum plate not only does not need to add...

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Abstract

The invention discloses a method for removing fluorine in a wet-method zinc smelting process. The method comprises the following steps: enabling a perchloric acid zinc sulfate solution and an aluminumplate or aluminum chippings to have chemical reaction, and removing the generated aluminum fluoride precipitates from a solution, so that the content of fluorine ions in the perchloric acid zinc sulfate solution can be reduced. According to the method, the fluorine ions in the perchloric acid zinc sulfate solution can be removed by adopting the aluminum plate or aluminum chippings, no special impurity removal process and device are not added, no novel chemicals and auxiliary materials are needed, the process is simple, the investment cost is low, the fluorine removal effect is good, the zincmetal loss caused by adding the impurity removal process can be effectively avoided, and the zinc electrodeposition can be continuously and normally performed.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular mainly relates to a method for removing fluorine in a zinc hydrometallurgy process. Background technique [0002] In the wet zinc smelting industry, the fluoride ion in the zinc sulfate solution has always been a technical difficulty and forbidden area of ​​the industry. However, if the concentration of fluoride ions in the zinc sulfate solution is too high, the cathode plate will be severely corroded during the zinc electrowinning process, thereby reducing the service life of the cathode plate and causing problems such as difficulty in the separation of precipitated zinc, which will seriously affect the continuous and normal progress of the zinc electrowinning process. At present, the common methods for separating fluoride ions from zinc sulfate solution in the wet zinc smelting industry include chemical precipitation, ion exchange and extraction and separation of fluorine and ...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B19/20
CPCC22B3/44C22B19/26Y02P10/20
Inventor 余继勇王家仁朱国邦何永兴杨丽菊王建忠姜自林彭光运梅相位王海喜杨明新范慧修杨恩斗周先黎匡志恩濮永许
Owner 云南永昌铅锌股份有限公司
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