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Method for simultaneously removing fluorine and chlorine from zinc electrolyte

A zinc electrolyte and electrolyte technology, applied in the improvement of process efficiency, photography process, instruments and other directions, can solve the problems of poor adsorption selectivity, high processing cost, unstable effect, etc. The effect of poor adsorption selectivity

Active Publication Date: 2021-04-27
CHANGSHA ENVIRONMENTAL PROTECTION COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for simultaneously removing fluorine and chlorine from the zinc electrolyte, which solves the problems of large amount of slag and high processing cost in the existing chemical precipitation technology , and solve the problems of poor adsorption selectivity, unstable effect, and desorption liquid pollution existing in the existing ion exchange technology, and have the characteristics of simplicity, cheapness, high efficiency, and simultaneous removal of fluorine and chlorine

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  • Method for simultaneously removing fluorine and chlorine from zinc electrolyte
  • Method for simultaneously removing fluorine and chlorine from zinc electrolyte

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Effect test

Embodiment 1

[0087] The composition of the fluorine-containing chlorine-zinc electrolyte is as follows: zinc concentration 120g / L, sulfate radical concentration 180g / L, fluoride ion concentration 400mg / L, chloride ion concentration 600mg / L, pH=1.6.

[0088] A method for removing fluorine and chlorine simultaneously from zinc electrolyte, comprising the following steps:

[0089] (1) Add 101g ZnO to 100L zinc electrolyte, mix and stir to adjust for 0.5h, obtain the zinc electrolyte to be purified with pH=4;

[0090] (2) Add the zinc electrolytic solution to be purified to the ion exchange column filled with 5L, D403 chelating resin (iminodiacetic acid type) at a speed of 15m / h, carry out resin adsorption, and purify the zinc electrolytic solution and the chelating resin The contact residence time is 30min. After the adsorption is completed, 100L of purified zinc electrolyte is obtained, in which the fluoride ion concentration is 35mg / L and the chloride ion concentration is 160mg / L;

[0091]...

Embodiment 2

[0097] The composition of the fluorine-containing chlorine-zinc electrolyte used is: zinc concentration 150g / L, sulfate radical concentration 225g / L, fluoride ion concentration 350mg / L, chloride ion concentration 800mg / L, pH=1.4.

[0098] A method for removing fluorine and chlorine simultaneously from zinc electrolyte, comprising the following steps:

[0099] (1) Add 148g ZnO to 100L zinc electrolyte, mix and stir to adjust for 1h, obtain the zinc electrolyte to be purified with pH=2.5;

[0100] (2) Add the zinc electrolyte to be purified to an ion exchange column filled with 6L, D403 chelating resin (iminodiacetic acid type) at a speed of 7.5m / h, and perform resin adsorption to purify the zinc electrolyte and chelating resin The contact residence time is 60min. After the adsorption is completed, 100L of purified zinc electrolyte is obtained, in which the fluoride ion concentration is 24mg / L and the chloride ion concentration is 136mg / L;

[0101] (3) use the aluminum chloride...

Embodiment 3

[0107] The composition of the fluorine-containing chlorozinc electrolyte used is: zinc concentration 120g / L, sulfate concentration 180g / L, fluoride ion concentration 400mg / L, chloride ion concentration 600mg / L, pH=1.6.

[0108] A method for simultaneously removing fluorine and chlorine from zinc electrolyte, comprising the following steps:

[0109] (1) add 101g ZnO to 100L zinc electrolyte, mix and stir to adjust 1h, obtain the zinc electrolyte to be purified of pH=5;

[0110] (2) Add the zinc electrolyte to be purified to the ion exchange column filled with 5L, D412 chelating resin (phosphoramidic acid type) at a speed of 10m / h, carry out resin adsorption, and purify the contact between the zinc electrolyte and the chelating resin. The time is 45 minutes. After the adsorption, 100L of purified zinc electrolyte was obtained, wherein the fluoride ion concentration was 41mg / L, and the chloride ion concentration was 144mg / L;

[0111] (3) use 15L, 0.3mol / L of aluminum chloride s...

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Abstract

The invention discloses a method for simultaneously removing fluorine and chlorine from zinc electrolyte, and belongs to the field of zinc smelting. The method comprises the following steps that the zinc electrolyte and zinc oxide are mixed and stirred to obtain zinc electrolyte to be purified; resin adsorption is conducted through an ion exchange column filled with chelating resin to obtain purified zinc electrolyte; primary desorption regeneration is preformed on the chelating resin by adopting an aluminum chloride solution to obtain a first desorption solution and chelating resin subjected to primary desorption regeneration; secondary desorption regeneration is performed on the chelate resin subjected to primary desorption regeneration by adopting pure water to obtain a second desorption solution and chelate resin subjected to secondary desorption regeneration, and the chelate resin subjected to secondary desorption regeneration returns to the resin adsorption step for recycling; and the first desorption solution and the second desorption solution are mixed, a precipitant is added for precipitation reaction and settling separation to obtain sediments, and the sediments are taken out after meeting the standard. The method has the characteristics of simplicity, convenience, cheapness, high efficiency and capability of simultaneously removing fluorine and chlorine.

Description

technical field [0001] The invention belongs to the field of zinc smelting, and in particular relates to a method for simultaneously removing fluorine and chlorine from a zinc electrolyte. Background technique [0002] Zinc hydrometallurgy is the most widely used process in zinc smelting. In the zinc hydrometallurgy process, it mainly includes roasting, leaching, leachate purification and electrolysis. Among them, leaching and leachate purification are the key steps to determine the technical indicators of the zinc hydrometallurgy process. After acid leaching of zinc calcine or other zinc-containing materials, impurities such as Cu, Cd, Co, Fe, As, F, Cl, Ca, and Mg ions will generally remain in the leaching solution, which is extremely harmful to the zinc electrolytic deposition process. Among them, F and Cl ions are the most common anionic impurities in zinc electrolyte. Fluoride ions can corrode the oxide film on the surface of the cathode aluminum plate, making it dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/42C22B3/24C25C1/16
CPCC22B19/26C22B3/42C22B3/24C25C1/16Y02P10/20
Inventor 姜科
Owner CHANGSHA ENVIRONMENTAL PROTECTION COLLEGE