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Environment-friendly tin electrolytic refining electrolyte

An electrolytic refining, green and environmentally friendly technology, applied in the field of non-ferrous metallurgy, can solve the problems of poisonous and harmful phenolsulfonic acid, poor working environment in the workshop, heavy smell of phenolsulfonic acid, etc., and achieve the effect of improving stability and improving the labor environment

Inactive Publication Date: 2018-02-09
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of heavy smell of phenolsulfonic acid, poisonous and harmful phenolsulfonic acid, and poor labor environment in the workshop in the traditional tin electrolytic refining process, the present invention proposes a green and environment-friendly tin electrolytic refining electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The electrolyte composition of tin electrolytic refining is: 90 g / L H 2 SO 4 , 40 g / LSnSO 4 Form, 5 g / L gallic acid, 2 g / L β-naphthol, 5 g / L latex; electrolyte temperature 35°C; current density 100 A / m 2 ; The electrolysis workshop is naturally ventilated. After 15 days of electrolysis, no obvious odor was smelled in the workshop, and the working environment was good. The concentration of Sn(II) in the electrolyte is maintained at about 18 g / L, and the concentration of Sn(IV) is about 2 g / L lower than that in the traditional electrolysis workshop. The stability of the electrolyte is better than that of the traditional electrolyte.

Embodiment 2

[0019] The electrolyte composition of tin electrolytic refining is: 90 g / L H 2 SO 4 , 60 g / L SnSO 4 , 6 g / L gallic acid, 5 g / L cresol sulfonic acid, 4 g / L β-naphthol, 2 g / L latex; the electrolyte temperature is 35°C; the current density is 100 A / m 2 ; The electrolysis workshop is naturally ventilated. After 12 days of electrolysis, the workshop has some odor, which is lighter than the traditional electrolysis workshop. The concentration of Sn(II) in the electrolyte is maintained at about 25 g / L, and the stability of the electrolyte is slightly better than that of the traditional electrolyte.

Embodiment 3

[0021] The electrolyte composition of tin electrolytic refining is: 80 g / L H 2 SO 4 , 40 g / L SnSO 4 , 2 g / L methyl gallate, 7 g / L β-naphthol, 1 g / L latex; electrolyte temperature is 35°C; current density is 100 A / m 2 ; The electrolysis workshop is naturally ventilated. After 7 days of electrolysis, there is no obvious smell in the workshop, and the working environment is good. The concentration of Sn(II) in the electrolyte is maintained at about 16 g / L, and the stability of the electrolyte is slightly better than that of the traditional electrolyte.

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PUM

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Abstract

The invention discloses an environment-friendly tin electrolytic refining electrolyte. The electrolyte is composed of 80-140 g / L of H2SO4, 20-40 g / L of Sn2+(added in a mode of SnSO4), 0-10 g / L of beta-naphthol, 0-10 g / L of latex, 0-20 g / L of phenolsulfonic acid and 2-15 g / L of gallic acid or derivatives of the gallic acid. 20-40 g / L of phenolsulfonic acid or cresolsulfonic acid is generally addedinto traditional tin electrolytic refining electrolyte so as to inhibit oxidization of Sn2+ in the electrolyte, improve the stability of the electrolyte and improve the cathode morphology. However, the phenolsulfonic acid is strong in smell, toxic and harmful, thereby making the working environment in an electrolysis workshop poor. Accordingly, the environment-friendly electrolyte is provided by the invention, and the gallic acid or the derivatives of the gallic acid is / are adopted to partially or completely replace the phenolsulfonic acid or the cresolsulfonic acid. The environment-friendly tin electrolytic refining electrolyte has the advantages of being safe, environmentally friendly, good in stability and compact and even in cathode morphology and can be applied and popularized in thetin electrolysis industry.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, relates to a tin electrolytic refining electrolyte, in particular to a functional additive for the tin electrolytic refining electrolyte. Background technique [0002] Tin electrolytic refining is an important process for the preparation of metallic tin. The electrolytic refining of pure tin usually uses H 2 SO 4 + SnSO 4 base electrolyte. During the electrolysis process, the increase of the anode potential and the dissolved oxygen in the electrolyte will lead to the oxidation of Sn(II) to Sn(IV). Sn(IV) is easily hydrolyzed to generate Sn(OH) 4 colloid. Depletion of Sn(II) and Sn(OH) 4 The generation of colloids will affect the cathode deposition process of Sn(II), resulting in lower current efficiency, more cathode tin burrs, and serious grain formation. In order to suppress the oxidation of Sn(II), the tin electrolysis industry usually adds cresolsulfonic acid or phenolsulfo...

Claims

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Application Information

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IPC IPC(8): C25C1/14
CPCC25C1/14
Inventor 徐志峰钟晓聪李柱李金辉曹才放王成彦
Owner JIANGXI UNIV OF SCI & TECH
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