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Method for removing copper and cadmium through zinc hydrometallurgy and purification

A technology for hydrometallurgy of zinc and copper and cadmium, applied in the field of zinc hydrometallurgy for purification and removal of copper and cadmium, which can solve the problems of inefficient recovery of metals, high production costs, and large consumption of zinc powder, etc., achieve good economic benefits, reduce zinc Powder consumption, easy handling effect

Inactive Publication Date: 2018-01-09
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of large consumption of zinc powder, high production cost and inability to efficiently recycle various metals in the traditional process of purifying and removing copper and cadmium, the present invention provides a method for purifying and removing copper and cadmium by hydrometallurgy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Raw materials: in the zinc leaching solution, the Zn content is 97g / L, the Cu content is 260mg / L, and the Cd content is 320 mg / L;

[0013] (1) Copper removal: Add 0.3g / L of zinc powder to the zinc leaching solution, the residence time of zinc powder is 60min, the temperature is 60°C, and the copper content of the filtered solution is 15 mg / L; the filtered copper slag is pickled, and the concentration of dilute sulfuric acid is 5% sulfuric acid, the mass ratio of liquid to solid is 3:1 to pickle and recover copper powder, the copper content of copper powder is 92%, and the washing liquid is returned to the zinc hydrometallurgy system;

[0014] (2) Cadmium removal: Add 0.2g / L of zinc powder to the solution after copper removal to recover cadmium. Cotton contains 85% cadmium;

[0015] (3) Deep removal of copper and cadmium: Add zinc powder to the liquid after cadmium removal for deep removal of copper and cadmium, the addition amount is 0.5g / L, the reaction temperature is...

Embodiment 2

[0018] Raw materials: zinc leaching solution, Zn content 102g / L, Cu content 470mg / L, Cd content 360 mg / L

[0019] (1) Copper removal: Add 0.5g / L of zinc powder to the zinc leaching solution, the residence time of zinc powder is 60min, the temperature is 60°C, and the copper content of the filtered liquid is 20 mg / L; the filtered copper slag is pickled, and the concentration of dilute sulfuric acid is 5% sulfuric acid, the mass ratio of liquid to solid is 3:1, pickling and recovering copper powder, the copper content of copper powder is 86%, and the washing liquid is returned to the zinc hydrometallurgy system;

[0020] (2) Cadmium removal: Add 0.2g / L of zinc powder to the solution after copper removal to recover cadmium. Cotton contains 90% cadmium;

[0021] (3) Deep removal of copper and cadmium: add zinc powder to the liquid after cadmium removal for deep removal of copper and cadmium, the addition amount is 2g / L, the reaction temperature is 60-65°C, the residence time of z...

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Abstract

The invention discloses a method for removing copper and cadmium through zinc hydrometallurgy and purification. According to the method, a conventional process of removing copper and cadmium through zinc powder replacement is subjected to fine separation stepwise, firstly, the zinc powder is added to remove copper, then zinc powder is added again to remove cadmium, finally copper and cadmium are deeply removed, and a subsequent purification process is conducted after a purified product is qualified. Compared with the traditional process of removing copper and cadmium through purification, thefine operation is adopted, the zinc powder consumption is greatly reduced, the purification cost is reduced, the content of produced copper residues and cadmium residues is high, and the copper residues and the cadmium residues are easy to dispose; and the process is simple and reliable, industrial production can be easily achieved, and excellent economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrosmelting, and relates to a method for purifying and removing copper and cadmium in zinc hydrosmelting. Background technique [0002] During the zinc hydrometallurgy process, impurities in the leaching solution that affect product quality mainly include copper, cadmium, cobalt, nickel, arsenic, antimony, germanium and other elements, and three-stage purification is usually used to remove impurities. The traditional one-step copper and cadmium removal process uses excess zinc powder to combine to remove copper and cadmium, and then filters to produce copper and cadmium slag; the copper and cadmium slag is then acid leached, and the copper is left in the slag to recover with black copper mud, and the leachate is added to the slag. Zinc powder is replaced by cadmium cotton, and the leachate is returned to the system. This method consumes a lot of zinc powder, and the production cost is high, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C22B19/20C22B15/00C22B17/00
CPCY02P10/20
Inventor 张恩玉余江鸿鲁兴武陈一博崔海瑞程亮曹桂银李守荣李俞良马琳亭李贵
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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