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High-purity antimony producing method by two-section fused salt electrolysis method

A technology of molten salt electrolysis and molten salt electrolyte, which is applied in the field of two-stage molten salt electrolysis to produce high-purity antimony, can solve the problems of complex equipment structure, limited purification effect, and high purification cost, and achieve the effect of simple process

Inactive Publication Date: 2015-01-28
贵州重力科技环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for producing high-purity antimony by two-stage molten salt electrolysis, which overcomes the defects of high purification cost, complex equipment structure and limited purification effect in the prior art

Method used

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  • High-purity antimony producing method by two-section fused salt electrolysis method

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Effect test

Embodiment 1

[0026] Break the industrial antimony ingots into irregular antimony blocks of about 3mm, add the broken antimony blocks and molten salt electrolyte into the electrolytic cell, use the anode method for electrolysis, turn on the heating device, raise the temperature to 750°C, and control the current density at 6650A / m 2 , after electrolysis for 3 hours, a product was obtained; a product was electrolyzed by cathodic method, the temperature was set to 700°C, and the cathodic current density was 1200A / m 2 , Electrolyzed for 3 hours to obtain a high-purity antimony product, which was determined by GDMS to have a purity of 99.99%.

Embodiment 2

[0028] Break the industrial antimony ingots into irregular antimony blocks of about 3mm, add the broken antimony blocks and molten salt electrolyte into the electrolytic tank, use the anode method for electrolysis, turn on the heating device, raise the temperature to 850°C, and control the current density at 6650A / m 2 , after 3 hours of electrolysis, a product was obtained; a product was electrolyzed by cathodic method, the temperature was set to 750°C, and the cathodic current density was 1200A / m 2 , Electrolyzed for 3 hours to obtain a high-purity antimony product, which was determined by GDMS to have a purity of 99.99%.

Embodiment 3

[0030] Break the industrial antimony ingots into irregular antimony blocks of about 3mm, add the broken antimony blocks and molten salt electrolyte into the electrolytic cell, use the anode method for electrolysis, turn on the heating device, raise the temperature to 900°C, and control the current density at 6650A / m 2 , after electrolysis for 3 hours, a product was obtained; a product was electrolyzed by cathodic method, the temperature was set to 800°C, and the cathodic current density was 1200A / m 2 , Electrolyzed for 3 hours to obtain a high-purity antimony product, which was determined by GDMS to have a purity of 99.99%.

[0031] Such as figure 1 As shown, the electrolytic cell used in a method for producing high-purity antimony by a two-stage molten salt electrolysis method of the present invention includes a cell body 1, a cover plate 7, two groups of first electrodes 2 and second electrodes 3, and a flue gas outlet 6 , chute 8, coarse antimony feed port 4, electrolyte...

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Abstract

The invention relates to a high-purity antimony producing method by a two-section fused salt electrolysis method. The high-purity antimony producing method includes: a step of adding smashed antimony blocks and a fused salt electrolyte into an electrolytic cell comprising a first graphite electrode and a second graphite electrode; a step of electrolyzing firstly by an anode method, wherein the first electrode is set as an anode, the second electrode is set as a cathode, in an anode region, the antimony and impurity metals lose electrons, become positive ions, enter the fused salts, migrate to the surface of the cathode under actions of an electric field and diffusion and receive the electrons, and the impurity metals, which have standard electrode potentials lower than the standard electrode potential of the antimony, comprising Na, K, Zn, Cd, Fe, Pb, Sn, Cu and Ni are removed; and a step electrolyzing firstly by a cathode method, wherein the first electrode is set as a cathode, the second electrode is set as an anode, the reduced antimony elementary substance is adopted as a cathode, and nonmetal impurity elements comprising As, S and Bi are removed. The high-purity antimony producing method adopts the two-section fused salt electrolysis method, and optimizes electrolysis parameters to obtain antimony having purity of 99.99%. The high-purity antimony producing method is simple in process and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing high-purity antimony, in particular to a method for producing high-purity antimony by a two-stage molten salt electrolysis method, which belongs to the metal purification industry. Background technique [0002] In recent years, with the rapid development of science and technology, high-purity antimony has been widely used in the fields of semiconductor materials, phase change materials and infrared materials. Antimony ingots are the main products. Many developed countries import crude antimony from our country, and then sell it back to my country after further processing and purification, and obtain higher profits from it. Chinese patent CN101565781A discloses a method and device for producing high-purity antimony, CN101844229A discloses a preparation method and production equipment for high-purity antimony, CN201321484Y discloses a device for producing high-purity antimony, and CN1676638A discloses a puri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34
CPCC25C3/34C25C7/00
Inventor 赵应黔王良栋李武斌陈明慧张彬
Owner 贵州重力科技环保股份有限公司
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