A kind of method for preparing metallic zinc by molten salt electrolysis

A technology of molten salt electrolysis and metal zinc, which is applied in the field of molten salt electrolysis to prepare metal zinc, which can solve the problems of long process and complicated process, and achieve the effects of reducing electrolysis temperature, simplifying the process, and preventing volatilization loss

Active Publication Date: 2021-01-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problems of long process and complicated process in the prior art, the object of the present invention is to provide a method for preparing zinc metal by molten salt electrolysis, so as to simplify the process for preparing zinc metal

Method used

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  • A kind of method for preparing metallic zinc by molten salt electrolysis

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Effect test

Embodiment 1

[0036] Add a certain amount of polyvinyl alcohol binder with a concentration of 0.03g / ml to the zinc sulfide concentrate powder below 200 mesh. The specific amount of binder is: add 5ml of polyvinyl alcohol per 100g zinc sulfide concentrate powder material solution. Making zinc sulfide concentrate pellets with a particle size of 2-5 mm by using a disc granulator, drying the zinc sulfide concentrate pellets at 90° C. for 5 hours to obtain pelletized zinc sulfide concentrate particles. NaCl-CaCl in a molar ratio of 1:1 2 The molten salt is used as the electrolyte for electrolysis, the electrolysis temperature is 800°C, and the voltage is 3.4V. The purity of the prepared zinc is over 99%, and the refined zinc with a purity of over 99.9% is obtained after vacuum distillation of the prepared zinc.

Embodiment 2

[0038]Add a certain amount of polyvinyl alcohol binder with a concentration of 0.03g / ml to the zinc sulfide concentrate powder below 200 mesh. The specific amount of binder is: add 10ml of polyvinyl alcohol per 100g zinc sulfide concentrate powder material solution. Making zinc sulfide concentrate pellets with a particle size of 5-10 mm by using a disc granulator, drying the zinc sulfide concentrate pellets at 100° C. for 6 hours to obtain pelletized zinc sulfide concentrate particles. The electrolysis was carried out using NaCl-KCl molten salt with a molar ratio of 1:2 as the electrolyte, the electrolysis temperature was 850°C, and the voltage was 3.5V. The purity of the prepared zinc is more than 97%, and the refined zinc with a purity of more than 99.9% is obtained after vacuum distillation of the prepared zinc.

Embodiment 3

[0040] Add a certain amount of dextrin binder to the zinc sulfide concentrate powder below 200 mesh, the specific amount of binder is: add 0.5g of dextrin and 10ml of water per 100g of zinc sulfide concentrate powder material. Making zinc sulfide concentrate pellets with a particle size of 2-5 mm by using a disc granulator, drying the zinc sulfide concentrate pellets at 90° C. for 5 hours to obtain pelletized zinc sulfide concentrate particles. NaCl-CaCl in a molar ratio of 1:1:0.5 2 -KCl molten salt is used as the electrolyte for electrolysis, the electrolysis temperature is 820°C, and the voltage is 3.2V. The purity of the prepared zinc is over 99%, and the refined zinc with a purity of over 99.9% is obtained after vacuum distillation of the prepared zinc.

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Abstract

The invention belongs to the field of zinc preparation, and especially relates to a method for preparing zinc through molten salt electrolysis. According to the method, chloride melt is taken as the electrolyte, in an electrolysis device, spherical zinc sulfide concentrate particles are subjected to molten salt electrolysis; during the electrolysis process, liquid zinc generated by electrolysis issucked out intermittently from a liquid zinc layer, and spherical zinc sulfide concentrate particles are intermittently added into the liquid zinc layer to supplement reactants. The method takes chloride melt as the electrolyte, in the electrolysis device, the spherical zinc sulfide concentrate particles are subjected to molten salt electrolysis; the spherical zinc sulfide concentrate particles are added into the liquid zinc layer to participate the electrochemical reduction reactions directly to generate zinc, the step that zinc sulfide is oxidized to generate zinc is not needed, and thus the zinc preparation technology is simplified.

Description

technical field [0001] The invention belongs to the field of metal zinc preparation, in particular to a method for preparing metal zinc by molten salt electrolysis. Background technique [0002] At present, the production methods of metal zinc are mainly divided into two categories: fire method and wet method. [0003] Pyrochemical zinc smelting is the process of pre-roasting zinc sulfide concentrate into zinc oxide material, and then using carbon as a reducing agent at high temperature to reduce and extract metal zinc from zinc oxide material; it includes three main processes: roasting, reduction distillation and refining , mainly including flat tank zinc smelting, vertical tank zinc smelting, closed blast furnace zinc smelting and electrothermal zinc smelting. [0004] Zinc hydrometallurgy is actually a combined process of pyromethod and wet method. It is a zinc smelting method that appeared in the early 20th century, including five main processes of roasting, leaching, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34
CPCC25C3/34
Inventor 杜金晶王斌李林波俞娟方钊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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