Activation extraction separation method for fluorine and chloride ions in zinc sulfate solution

A technology of zinc sulfate solution and ion activation, applied in the direction of improving process efficiency, etc., to achieve the effect of improving elution effect, reducing back extraction alkali consumption and crystallization scaling pressure

Active Publication Date: 2014-07-02
GREENNOVO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In short, the existing technologies for removing fluoride and chloride ions in zinc sulfate solution still have various deficiencies or limitations, and it is still necessary to develop new technological routes to improve them.

Method used

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  • Activation extraction separation method for fluorine and chloride ions in zinc sulfate solution

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example 1

[0033] (1) Adjusting pH and activating: Purify the qualified electrowinning solution (chemical composition: Zn 2+ 134.3g / L, F - 0.54g / L, Cl - 2.79 g / L, pH value 4.5-5.2, temperature 56°C) into the zinc electrowinning waste liquid in the zinc wet process system (chemical composition: Zn 2+ 49.5g / L, F - 0.19g / L, Cl - 0.47 g / L, H 2 SO 4 153.7g / L, temperature 35°C), the ratio of qualified electrowinning new solution and zinc electrowinning waste solution is (volume ratio) 20:1, and they are mixed evenly in the stirring tank. Zinc sulfate solution (chemical composition is: Zn 2+ 129.8g / L, F - 0.52g / L, Cl - 2.71 g / L, pH 1.0, temperature 26°C). Then pump the zinc sulfate solution after cooling into the self-made activation device, and pass into the activation agent ozone (O 3 ), ozone is produced from an ozone generator. The ozone flux is F in the zinc sulfate solution - 5 times the amount (mass ratio), the activation time is 1h, and the activation process is co...

example 2

[0039] (1) Adjusting pH and activating: Purify the qualified electrowinning solution (chemical composition: Zn 2+ 129.7g / L, F - 0.58g / L, Cl - 3.58 g / L, pH value 4.5-5.2, temperature 60°C) into the zinc electrowinning waste liquid in the zinc wet process system (chemical composition: Zn 2+ 47.5g / L, F - 0.18g / L, Cl - 0.50 g / L, H 2 SO 4 145.6g / L, temperature 34°C), the amount (volume) of zinc electrowinning waste solution is 3% of the volume of qualified electrowinning solution, and mixed evenly in the stirring tank. Zinc sulfate solution (chemical composition is: Zn 2+ 127.3g / L, F - 0.57g / L, Cl - 3.50 g / L, pH 2.0, temperature 25°C). Then pump the zinc sulfate solution after cooling into the self-made activation device, and pass into the activation agent ozone (O 3 ), ozone is produced from an ozone generator. The ozone flux is F in the zinc sulfate solution - The amount is 3.5 times (mass ratio), the activation time is 1.5h, and the activation process is co...

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Abstract

The invention relates to an activation extraction separation method for fluorine and chloride ions in a zinc sulfate solution, which comprises the following steps: acid adjustment activation: adding concentrated sulfuric acid into the zinc sulfate solution to adjust the pH value and temperature, and mixing and blending the solution with an activating agent to damage the fluorine-containing metal complexes in the solution and decompose the fluorine-containing metal complexes into free-state fluorine ions and convert into HF molecules; extraction separation: separating the fluorine and chloride ions in the activated zinc sulfate solution by use of an extraction agent to obtain an organic phase loaded with fluorine and chloride and a raffinate with low content of fluorine and chloride; raffinate purification: removing most of the extraction organic phase through multi-segment standing clarification and ultrasonic air flotation; performing deep adsorption by use of powdery active carbon to remove residual organic phase in the raffinate to obtain adsorption residue and qualified raffinate; and impurity washing and back extraction of the loaded organic phase. According to the method provided by the invention, the key reason hindering the extraction fluorine removal effect in the zinc sulfate solution as well as the crystallization and scaling in the back extraction process is found so that the different problems are simple and easy to impellent. The fluorine removal rate exceeds 60%, and the chlorine removal rate reaches about 90%. The liquid after impurity washing and the liquid after back extraction directly return to an alkali washing process of a zinc hydrometallurgy system to be comprehensively utilized.

Description

technical field [0001] The invention belongs to the technical field of purification of zinc smelting solution by wet method, and specifically relates to a method for activating, extracting and separating fluorine and chloride ions from zinc sulfate solution, and is especially suitable for purifying zinc sulfate solution with high content of fluorine and chloride ions in zinc smelting by wet method separate. Background technique [0002] In the wet zinc smelting industry, the fluorine and chloride ions in the zinc sulfate solution have always been technical difficulties and forbidden areas in this industry. As we all know, in the process of zinc electrowinning, if the concentration of chloride ions in the zinc sulfate solution is too high, the cathode and anode plates will be severely corroded, resulting in a decrease in the life of the anode and cathode plates, and a decrease in the quality of zinc precipitated from the cathode. However, the high concentration of fluoride i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/20C22B3/40
CPCY02P10/20
Inventor 童晓忠李春林王浩祥
Owner GREENNOVO ENVIRONMENTAL TECH CO LTD
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