Method for increasing copper recovery rate in zinc hydrometallurgy process

A technology for hydrometallurgical zinc smelting and recovery rate, applied in the field of metal smelting, can solve the problems of copper easily sinking into leaching slag and low recovery rate, and achieve the effects of increasing waste residue, improving recovery rate, and simple process operation procedures

Active Publication Date: 2012-12-19
ZHUZHOU SMELTER GRP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the roasting-leaching process is adopted for wet zinc smelting. During roasting, the copper in the zinc concentrate will form compounds such as copper oxide. Powder replaces the copper in the leaching solution for recovery. Due to the high pH control during the leaching process and the presence of a reducing atmosphere, copper is easy to sink into the leaching slag, and the recovery rate is about 40%.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for increasing copper recovery rate in zinc hydrometallurgy process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a) Oxidative leaching of zinc concentrate by using electroplating waste solution.

[0033] The weight percentage content of the zinc concentrate is: Zn50%, S32%, Fe10%, Cu2.8%.

[0034] The chemical composition of the waste liquid is: H 2 SO 4 210g / L, Zn 2+ 58g / L, Mn 2+ 6g / L, when mixed with pre-neutralized reflux underflow, H 2 SO 4 The concentration is controlled at 100g / L, and the amount of zinc concentrate is 70g / L.

[0035] The leaching temperature is 95 ℃ ~ 102 ℃, and the 120Nm 3 / t zinc concentrate, the volume percentage is 98% oxygen, and the leaching time is 30h.

[0036] The composition of the leachate obtained is: Zn 2+ 133g / L, H 2 SO 4 24g / L, Cu 2+ 1.8g / L, Fe 3+ 10.3g / L, Fe 2+ 4.2g / L.

[0037] b) performing reduction treatment on the leaching solution, the leaching temperature is 80° C., and the leaching time is 4 hours. The solution contains H during pre-neutralization 2 SO 4 24g / L, time 2.5h, end point pH value 2.3. The chemical compositi...

Embodiment 2

[0042] a) Oxidative leaching of zinc concentrate by using electroplating waste solution.

[0043] The weight percent content of the zinc concentrate is: Zn41%, S32%, Fe8%, Cu1.2%.

[0044] The chemical composition of the waste liquid is: H 2 SO 4 210g / L, Zn 2+ 58g / L, Mn 2+ 6g / L, when mixed with pre-neutralized reflux underflow, H 2 SO 4 The concentration is controlled at 90g / L, and the amount of zinc concentrate is 120g / L.

[0045] The leaching temperature is 95 ℃ ~ 102 ℃, and the 110Nm 3 / t zinc concentrate, the volume percentage is 98% oxygen, and the leaching time is 28h.

[0046] The composition of the leachate obtained is: Zn 2+ 130g / L, H 2 SO 4 18g / L, Cu 2+ 1.3g / L, Fe 3+ 11g / L, Fe 2+ 5.1g / L.

[0047] b) Perform reduction treatment on the leaching solution, the leaching temperature is 90°C, and the leaching time is 3.5h. The solution contains H during pre-neutralization 2 SO 4 18g / L, time 3h, end point pH value 2.5. The chemical composition of the soluti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for increasing copper recovery rate in zinc hydrometallurgy process. The method comprises the following steps of: a) performing oxidation leaching on zinc concentrate in the solution of sulfuric acid; b) reducing the leachate, preneutralizing the reduced liquid and returning the generated sediment to the oxidation leaching step; c) performing iron sedimentation on the supernatant obtained by preneutralization; d) performing neutral leaching by adding zinc oxide (ZnO) calcine and the solution of sulfuric acid into the supernatant subjected to iron sedimentation,and returning the obtained sediment to the preneutralization step; and e) adding zinc powder into the supernatant to displace and recover copper (Cu). By the method, the copper can be recovered during zinc hydrometallurgy, so that the copper in the zinc concentrate enters the solution to form copper sulfate, and the leaching rate reaches about 90 percent; the dissolved copper is not precipitated together with the iron by controlling the pH value in the iron sedimentation process; the sediments which have high copper content and are generated in the processes of preneutralization, neutral leaching and the like are returned to the oxidation leaching step, so the copper recovery rate can reach 80 percent; and the operation procedure of the process is simple, the discharge quantity of waste residues, waste gas and waste water is not increased, and environmental pollution is avoided.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a method for improving the recovery rate of copper in a zinc hydrometallurgy process. Background technique [0002] Since the 1970s, zinc hydrometallurgy technology has developed rapidly. Compared with zinc pyrometallurgy, zinc hydrometallurgy has the advantages of good working conditions, environmental protection, easy continuous production, automation, large-scale, and convenient comprehensive recycling. Used in new smelters. Hydrometallurgy zinc slag contains a large amount of metals with recycling value. With the development of smelting technology, the requirements of circular economy, environmental protection and the drive of economic interests, all smelting enterprises have put the comprehensive recycling work into an important position and increased The strength of comprehensive recycling. [0003] Metals with recycling value can be recovered at the same time in the process...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B3/08C22B3/46C22B19/00C22B15/00
CPCY02P10/20
Inventor刘志祥周正华袁建明彭小明孙天友陈阳陈敬阳
OwnerZHUZHOU SMELTER GRP