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A method for synergistic leaching of sphalerite and chalcocite

A technology of sphalerite and chalcocite, which is applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems that the leaching process is difficult to deal with sphalerite, achieve industrial application, save energy, and reduce acid consumption Effect

Active Publication Date: 2020-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the above-mentioned prior art, in order to solve the problem that it is difficult to process sphalerite by using the traditional wet leaching process, in order to improve the copper recovery rate of chalcocite heap leaching and shorten the leaching cycle, in order to seek a suitable sphalerite A greener, simpler, more efficient, and more cost-effective leaching process for the status quo of co-associated resources with chalcocite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix sphalerite powder and chalcocite powder at a mass ratio of 20:1, and make slurry with water, dilute sulfuric acid solution and mineral powder, and the concentration of the slurry is 2% to 5%. Then add sulfuric acid as a leaching agent, and use sulfuric acid solution to control the pH value of the leaching system to be no more than 2.0, control the reaction temperature of the leaching system to 30°C, the stirring speed to 170rpm, and the redox potential of the system to be 200-400 mV vs. Ag / AgCl. On the 10th day, the Zn recovery rate reached 15%; on the 25th day, the Zn recovery rate reached 25%; the Cu recovery rate reached 40% in the first two days. The leaching solution is extracted and back-extracted and then electrodeposited to obtain metal Zn and Cu, and the raffinate is returned for the preparation of ore pulp. Compared with the prior art, the Zn recovery rate of this embodiment is increased by 25%; the chalcocite leaching cycle is shortened by five-sixths com...

Embodiment 2

[0031] Mix sphalerite powder and chalcocite powder at a mass ratio of 160:1, and make slurry with water, dilute sulfuric acid solution and ore powder. The concentration of the slurry is 2% to 5%. Then add sulfuric acid as a leaching agent, and use sulfuric acid solution to control the pH value of the leaching system to be no more than 2.0, control the reaction temperature of the leaching system to 20°C, the stirring speed to 200rpm, and the oxidation-reduction potential of the system to 200-400mV vs. Ag / AgCl. On the 10th day, the Zn recovery rate reached 15%; on the 25th day, the Zn recovery rate reached 35%; the Cu recovery rate reached 40% in the first two days. The leaching solution is extracted and back-extracted and then electrodeposited to obtain metal Zn and Cu, and the raffinate is returned for the preparation of ore pulp. Compared with the prior art, the Zn recovery rate of this embodiment is increased by 75%; the chalcocite leaching cycle is shortened by five-sixths ...

Embodiment 3

[0033] Mix sphalerite powder and chalcocite powder at a mass ratio of 170:1, and make slurry with water, dilute sulfuric acid solution and ore powder. The concentration of the slurry is 2% to 5%. Then add sulfuric acid as a leaching agent, and use sulfuric acid solution to control the pH value of the leaching system to be no more than 2.0, control the reaction temperature of the leaching system to 35°C, the stirring speed to 250rpm, and the oxidation-reduction potential of the system to 200-400mV vs. Ag / AgCl. On the 10th day, the Zn recovery rate reached 17%; on the 25th day, the Zn recovery rate reached 30%; the Cu recovery rate reached 40% in the first two days. The leaching solution is extracted and back-extracted and then electrodeposited to obtain metal Zn and Cu, and the raffinate is returned for the preparation of ore pulp. Compared with the prior art, the Zn recovery rate of this embodiment is increased by 50%; the chalcocite leaching cycle is shortened by five-sixths ...

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Abstract

The invention relates to a marmatite / chalcocite cooperative leaching method including steps of: 1) crushing and grinding marmatite and chalcocite to prepare marmatite powder and chalcocite powder; 2)mixing the marmatite powder and chalcocite powder according to ratio and adding water to prepare ore pulp; 3) adding a leaching agent to the ore pulp and regulating pH value, and performing leaching with control on chemical conditions of the solution to obtain leachates which are rich in zinc and copper respectively; 4) performing extraction, reverse extraction and then electro-deposition to the leachates to prepare zinc and copper. The method is free of changing the technical process of original method, is low in cost and simple in operation, is environment-friendly and is accessible in industrial application.

Description

technical field [0001] The invention relates to the fields of nonferrous metal hydrometallurgy and mineral processing, in particular to a method for synergistic leaching of sphalerite and chalcocite to obtain a Zn-rich and Cu-rich leaching solution. Background technique [0002] Both chemical leaching and biological leaching of metal minerals are hydrometallurgical processes. Chemical leaching can often obtain better leaching effects, but its leaching process is more complicated, often requiring extreme conditions such as high temperature and high pressure, and the cost is relatively high; bioleaching is a kind of leaching microorganism (sulfur or iron oxidizing bacteria). Next, the oxidative dissolution of sulfide ore and the release of target metal ions. During this process, ferrous ions and sulfur in the leaching system can be oxidized by leaching microorganisms, and finally produce ferric ions and sulfuric acid. Ferric ions and hydrogen ions can break the chemical bond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C22B3/08C22B3/18C22B3/44C22B15/00C22B19/20C25C1/12C25C1/16
CPCC22B1/005C22B3/08C22B3/18C22B3/44C22B15/0071C22B19/22C25C1/12C25C1/16Y02P10/20
Inventor 赵红波张伊升张艳军张宪
Owner CENT SOUTH UNIV
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