Method for producing superfine zinc powder by performing cyclone electrolyzing on zinc-containing alkali liquor

Abstract

The invention discloses a method for producing superfine zinc powder by performing cyclone electrolyzing on zinc-containing alkali liquor. The method is characterized by comprising the steps of: by taking the zinc-containing alkali liquor as a raw material and sodium sulfide as a lead removing agent, separating and depositing a small quantity of remaining lead in the zinc-containing alkali liquor, adding sodium sulfide of which the mass is 3-9 times of that of lead in the zinc-containing alkali liquor, and reacting for 1-5hous at the temperature of 30-100 DEG C; performing solid-liquid separation to obtain purified cleansing liquid and lead sulfide slag; performing electro-deposition on the purified cleaning liquid through a cyclone electrolyzing device to obtain the superfine electrolyzed powder, wherein the electrolyzing is performed for 0.5-5 hours at the temperature of 20-100 DEG C at the constant groove voltage of 2.9-3.4V; stopping electrolyzing when current density is reduced to 100-1000A / m<2>; and performing solid-liquid separation to obtain the purified cleansing liquid and lead sulfide slag when the electrolyzing ends and the concentration of zinc in the electrolyte is reduced to 1-3g / L. According to the method, low-concentration zinc ions in the zinc-containing alkali liquor can be removed, valuable metal can be furthest recycled, and the prepared superfine zinc powder has high purity and large market value, the zinc removing rate is high, the operation is simple, the labor intensity is low, no sewage is discharged in the whole production process, and environmental friendliness can be realized.

Description

technical field [0001] The invention belongs to the technical field of smelting, and relates to a method for producing electrolytic zinc powder by swirl electrolysis, in particular to a method for producing superfine zinc powder by swirl electrolysis of zinc-containing lye. Background technique [0002] The acid leaching slag produced by acid leaching of copper smelting dust contains a large amount of valuable metals lead, tin and a small amount of zinc. Most of the lead and part of zinc are leached through strong alkali solution leaching. After deleading by electrowinning, zinc in the circulating fluid will be continuously enriched, and it is necessary to recycle it. [0003] Most of the zinc in the alkaline system is recovered by electrowinning. The prior art, such as CN101012514, deals with the zinc-containing electrolyte, uses stainless steel as the anode, and titanium alloy as the cathode. 1500 A / m 2 Electrolyze for 1~10 h under the condition of current density, and p...

AI Technical Summary

Problems solved by technology

[0004] The traditional electrolysis method generally adopts flat plate (frame) electrolysis technology (device). During the electrolysis process, the alkaline solution system needs to maintain a high concentration of zinc ions. The electrolytic zinc powder in the alkaline system is easy to fall off from the cathode plate to the bottom of the tank, resulting in the collection of zinc powder. difficulty