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Method for selectively removing one valent anion impurities from sulfuric acid system electrolytes

An anionic impurity, sulfuric acid system technology, applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc., can solve the problems of fluorine and chlorine accumulation, low reliability, waste of Zn resources, etc.

Active Publication Date: 2017-06-20
WENZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if this method is used, it is difficult to guarantee the strict operating conditions and the reliability of the system is not high. Many domestic electric zinc manufacturers still need to regularly discharge a part of the electrolyte to solve the problem of fluorine and chlorine accumulation, so that electric zinc production can continue
In this way, not only a large amount of Zn resources are wasted in vain, but also acidic zinc electrolysis waste liquid containing high concentration of sulfuric acid and zinc salts is produced, which is very difficult to dispose of.

Method used

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  • Method for selectively removing one valent anion impurities from sulfuric acid system electrolytes
  • Method for selectively removing one valent anion impurities from sulfuric acid system electrolytes
  • Method for selectively removing one valent anion impurities from sulfuric acid system electrolytes

Examples

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Embodiment 1

[0046] Embodiment 1: Taking the typical electro-zinc process flow of 240,000 tons of metal zinc as an example with an annual production scale, the circulation volume required for the main circulation of its zinc electrolyte is about 8,000 tons / day; in order to maintain the stability of chlorine impurities, it is necessary to discharge The acid electrolyte is 200 tons / day. That is to say, in order to achieve chlorine balance, the total amount of chlorine impurities that production enterprises need to remove every day is about 200 tons of all chlorine impurities contained in the acid electrolyte. If Cl ‐ The removal rate is lower than 100%, and the same Cl can be achieved by increasing the bypass purification process ‐ Removal. The typical acidic electrolyte composition in the current process is Zn 2+ 58g / L, SO 4 2‐ 365g / L, H + with H 2 SO 4 160g / L, Cl ‐ 540mg / L, F ‐ 120mg / L. The diffusion dialysis test uses the TWDDA anion exchange membrane of Shandong Tianwei Membra...

Embodiment 21

[0059] Example 21: Taking the neutral electrolyte of the electric zinc factory in Example 1 as an example, the composition of the neutral zinc electrolyte is Zn 2+ 158g / L, SO 4 2‐ 365g / L, Cl ‐ 540mg / L, F ‐ 120mg / L, pH 5.5 (free H + concentration is 0). The diffusion dialysis test uses the TWDDA anion exchange membrane of Shandong Tianwei Membrane Technology Co., Ltd. to simulate image 3 in the purification process. Take 50L of the acidic electrolyte, add 98% concentrated sulfuric acid thereinto, the concentration is 5.0g / L. The acidity-adjusted electrolyte and pure water (or tap water) are passed into the diffusion dialyzer in a reverse flow manner, the flow ratio of the electrolyte to water is controlled to be 1:1, and the operating flow rate is 5.0L h ‐1 m ‐2 , after the system reached steady state operation, it was found that Cl in the acidic zinc electrolysis ‐ The removal rate reached 49.0%, F ‐ The removal rate reached 30.4%, SO 4 2‐ The loss rate is 0.80%, ...

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Abstract

The invention provides a method for selectively removing one valent anion impurities from sulfuric acid system electrolytes. The method is characterized in that the concentration of free H2SO4 in the electrolytes is adjusted, the electrolytes containing the free H2SO4 are led into a diffusion dialyzer waste acid chamber, water serves as receptor fluid to be led into a diffusion dialyzer recycling chamber in a reverse flow manner, the flow strength of the electrolytes in the diffusion dialyzing operation process is controlled, under drive of the concentration difference of partial free H2SO4 and the anion impurities in the electrolytes in a diffusion dialyzer, a transmission film is transmitted to the receptor fluid, and thin-H2SO4 purified electrolytes rich in anion impurities are formed. The new use manner of diffusion dialyzing is expanded, free acid recycling is changed into selective removing of the impurity ions, two existing problems of fluorine chlorine impurity removal and waste liquid disposal in the zinc electrolytes can be solved at the same time, and the new solution is provided for resource recycling of the wet metallurgy industry.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy. It relates to a method for selectively removing monovalent anion impurities from sulfuric acid system electrolyte, in particular to a method for selectively removing fluorine and chlorine impurities from zinc sulfate electrolyte, so as to ensure the electrolysis in the process cycle of hydrometallurgy The content of liquid fluorine and chlorine impurities is always lower than or meets the process requirements. The method is also applicable to the selective removal of monovalent anion impurities (such as F ‐ , Cl ‐ 、Br ‐ , I ‐ , NO 3 ‐ , NO 2 ‐ Wait). Background technique [0002] About 80% of the world's metal zinc is produced by hydrometallurgy technology, and its main process is ZnS ore raw material roasting→sulfuric acid leaching→electrodeposited zinc. The electrolyte before electrolytic zinc deposition is close to neutral, and part of the ZnSO 4 will be converted to H 2 SO 4 . The...

Claims

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Application Information

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IPC IPC(8): C25C1/16C25C7/06C22B3/42
CPCC22B3/42C25C1/16C25C7/06Y02P10/20
Inventor 张伟明陈庆陈宝生肖东
Owner WENZHOU UNIVERSITY
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