Zinc electrolysis technology of zinc ammonia complex aqueous solution

A technology of zinc ammonia complex and aqueous solution, which is applied in the field of hydrometallurgical electrolytic zinc, can solve the problems of high cost, difficult purification, high energy consumption, etc., and achieve the effect of saving electric energy

Inactive Publication Date: 2014-08-20
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a new method of ammonia leaching electrolytic zinc for various types of zinc ores in order to change and overcome the shortcomings of the traditional sulfuric acid method, such as difficult purification of electrolytic zinc solution, difficulty in solid-liquid separation, high energy consumption, heavy pollution, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a place in Hanyuan, Sichuan of Zinc oxide ore powder crushing - fine grinding to 80-120 mesh, take 5000g of the zinc oxide ore powder, the content of zinc in the zinc oxide ore powder is 5.21%, add 20-25% concentration of ammonia water, at normal temperature and pressure Circular leaching is carried out under the conditions, so that the concentration of zinc in the leaching solution reaches the concentration requirement of 60g / L-80g / L. The leaching rate of zinc in the ore powder is 85.36%. The leached zinc ammonia solution is reduced and purified by zinc powder to remove Cu 2+ , Cd 2+ , Pb 2+ , Ag + , Sb 3+ , As 3+ and other impurities, add 0.1g / L gelatin, 0.1g / L TP and 10mg / L TBN three additives in the purified zinc-ammonia complex solution, carry out electrolysis in the electrolytic cell, and the purity of the electrolytic zinc obtained is 99.84%.

Embodiment 2

[0034] Putting a certain place in Pingwu, Sichuan Zinc oxide ore powder crushing - fine grinding to 100-120 mesh, take 3600g of zinc oxide ore powder, the zinc content in the zinc oxide ore powder is 9.34%, add 20-25% concentration of ammonia water, under normal temperature and pressure conditions Circulation leaching is carried out under the condition of leaching, so that the concentration of zinc in the leaching solution reaches the concentration requirement of 80g / L-100g / L. The leaching rate of zinc in the ore powder is 90.28%. Cu 2+ , Cd 2+ , Pb 2+ , Ag + , Sb 3+ , As 3+ and other impurities, add 0.1g / L gelatin, 0.1g / L TP and 10mg / L TBN three additives in the purified zinc-ammonia complex solution, carry out electrolysis in the electrolytic cell, and the purity of the electrolytic zinc obtained is 99.89%.

Embodiment 3

[0036] Will Yunnan Maitreya somewhereZinc oxide ore powder crushing - finely ground to 100-160 mesh, take 2500g of this zinc oxide ore powder, the content of zinc in this zinc oxide ore powder is 13.64%, add ammonia water with a concentration of 20-25%, at room temperature and pressure Under the condition of cyclic leaching, the zinc concentration in the leaching solution reaches the concentration requirement of 120g / L-160g / L. The leaching rate of zinc in the ore powder is 93.27%, and the leached zinc ammonia solution is reduced and purified by zinc powder. Cu 2+ , Cd 2+ , Pb 2+ , Ag + , Sb 3+ , As 3+ and other impurities, add 0.1g / L gelatin, 0.1g / L TP and 10mg / L TBN three additives in the purified zinc-ammonia complex solution, carry out electrolysis in the electrolytic cell of the present invention, and the obtained electrolytic Zinc purity is 99.87%.

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Abstract

The invention relates to a zinc electrolysis technology of a zinc ammonia complex aqueous solution system. The zinc electrolysis technology is characterized in that in allusion to high-low grade zinc oxide ores, leaching is carried out with an aqua ammonia with the concentration of 20%-25%, and the zinc ammonia complex leachate is reduced and purified by a zinc powder and then goes into an electrolysis work section; a metal aluminum plate is used as a cathode, a ruthenium-coated metal titanium plate is used as an anode, and optimum process conditions determined through an orthogonal test method comprise: the temperature is controlled at 18-26 DEG C, the current is 6.5 A, the heteropole distance is 3.5 cm, the zinc concentration of an electrolysis solution is controlled at 60 g/L-160 g/L, the current efficiency is 94.33%, and the electric energy consumption is 2869 kW.h/t zinc, wherein the electric energy is saved by 10% compared with a traditional process; the electrolytic zinc product quality can be up to 99.84%-99.89%.

Description

technical field [0001] The invention relates to a practical new technology for electrolyzing zinc in a zinc ammonia complex solution, and belongs to the technical field of hydrometallurgy electrolyzing zinc. Background technique [0002] The traditional acid zinc smelting process is based on ZnSO 4 -H 2 SO 4 -H 2 In the O system, the residual zinc content in the acid leaching residue is high, and the lead and zinc are recovered by high-temperature gasification, which requires high energy consumption, large pollution, and large power consumption. The process is complicated, and it is not suitable for zinc oxide ore zinc materials. . In ammonia electrolytic zinc, Zn(Ⅱ)-NH is mainly used 3 -NH 4 Cl-H 2 O system, ZnCl 2 -NH 4 Cl-H 2 O system, Zn(Ⅱ)- (NH 4 ) 2 SO 4 -H 2 O system, but leaching electrodeposited zinc under ammonia water system has never been reported. [0003] Yang Shenghai, Tang Motang, Long Yunbing, Liu Zhihong, Luo Wei, etc. "A high-purity zinc and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16
Inventor 桑世华唐明林王渊
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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