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A device and method for electroadsorption and removal of fluorine and chloride ions from solution

A chloride ion and removal technology is used in the selective purification and removal of chloride ions, and in the field of high content of fluorine in zinc sulfate solution in the zinc hydrometallurgy system. Easy operation, short process, good effect of selection and removal

Active Publication Date: 2022-05-13
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, this method also solves the problems of low removal rate of general adsorption materials and loss of adsorbent, which is beneficial to industrial production and application.

Method used

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  • A device and method for electroadsorption and removal of fluorine and chloride ions from solution
  • A device and method for electroadsorption and removal of fluorine and chloride ions from solution
  • A device and method for electroadsorption and removal of fluorine and chloride ions from solution

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Embodiment 1

[0050] This embodiment provides an electroadsorption removal device for removing fluorine and chloride ions in zinc sulfate solution, including an intermediate electrode, the intermediate electrode is composed of an adsorption material, and the adsorption material is made of activated carbon and zeolite according to the ratio of 1:3. composition by weight.

[0051] Wherein, the zeolite is fly ash and a hollow structure powder coal-based zeolite is synthesized by the method of alkali fusion-hydrothermal synthesis.

Embodiment 2

[0053] This embodiment provides an electroadsorption removal device and method for removing fluorine and chloride ions in a zinc sulfate solution, and the specific steps are as follows:

[0054] The cathode and anode are made of aluminum and copper respectively, and the activated carbon and high alumina zeolite are filled in the anode area at a ratio of 1:2, and 1.5L zinc sulfate solution is pumped into the electroadsorption device, and an external potentiostat is connected to control the anode potential at 0.6V , the mechanical stirring speed was 100rpm, the adsorption was carried out for 2 hours, and the sample was measured. Use ion chromatography for fluorine and chloride ion content analysis. When no electricity is applied, the concentrations of fluorine and chloride ions in the liquid are 93.21mg / L and 537.54mg / L, respectively, and when the electricity is 0.6V, the concentrations of fluorine and chloride ions in the liquid are reduced to 43.21mg / L and 43.21mg / L respective...

Embodiment 3

[0057] This embodiment provides an electroadsorption removal device and method for removing fluorine and chloride ions in a zinc sulfate solution, and the specific steps are as follows:

[0058] The cathode and anode are made of aluminum and copper respectively, and the activated carbon and high alumina zeolite are filled in the anode area at a ratio of 1:2, and 1.5L zinc sulfate solution is pumped into the electroadsorption device, and an external potentiostat is connected to control the anode potential at 0.6V , the mechanical stirring speed was 300rpm, the adsorption was carried out for 2 hours, and the sample was measured. Use ion chromatography for fluorine and chloride ion content analysis. When no electricity is applied, the concentrations of fluorine and chloride ions in the liquid are 73.46mg / L and 427.68mg / L respectively, and when the electricity is 0.6V, the concentrations of fluorine and chloride ions in the liquid are reduced to 23.46mg / L and 23.46mg / L respectivel...

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Abstract

The invention relates to a device and method for electroadsorption and removal of fluorine and chloride ions from solution. The device includes an intermediate electrode, which is characterized in that the intermediate electrode is made of adsorption material, and the adsorption material is composed of activated carbon and zeolite in a ratio of 1: (1-5). The method uses the above-mentioned intermediate electrode. The device and method provided by the present invention can form local solution ion concentration polarization through the action of solution disturbance and electrostatic field force, and the electrostatic force of the anode can strengthen the non-specific adsorption and characteristic adsorption of the electric double layer, as well as the exchange of the intermediate electrode The reaction promotes the adsorption of fluorine and chlorine, thus producing the effect of "electro-stimulation", which increases the adsorption capacity of fluorine and chlorine ions in the anode area per unit mass in the system, and the fluorine removal rate is ≥ 90%, and the chlorine removal rate is ≥ 60%, while Zinc ions in solution are not affected. The process is convenient to operate, the process is short, the selective removal effect of fluorine and chlorine is good, and it is easy to meet the requirements of industrial application.

Description

technical field [0001] The invention belongs to the technical field of selective purification of hydrometallurgy solutions, in particular to a device and method for electroadsorption and removal of fluorine and chlorine ions from a solution, and is especially suitable for treating high-content fluorine and chlorine in zinc sulfate solutions in a zinc hydrometallurgy system Selective purification and removal of ions. Background technique [0002] In the wet zinc smelting system, fluoride ions mainly damage the cathode plate, making it difficult to strip the cathode; while chloride ions corrode the lead anode, resulting in an increase in the lead content in the electrolyte, reducing the quality of zinc, and easily producing chlorine gas that seriously pollutes the working environment . At present, the removal of fluorine and chloride ions has always been a technical difficulty and forbidden zone in this industry. [0003] The methods for removing fluorine and chloride ions f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/461C02F101/14C02F101/12
CPCC02F1/281C02F1/46109C02F2101/14C02F2101/12
Inventor 冯爱玲王海北赵磊林江顺尹一男
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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