Method for deeply purifying supernatant and removing cadmium and cobalt in zinc hydrometallurgy

A technology of hydrometallurgy and deep purification, applied in the direction of improving process efficiency, etc., can solve the problems of frequent redissolution of cadmium and cobalt, large consumption of zinc powder, unstable system, etc., to eliminate redissolution of cadmium and cobalt, steam consumption The effect of less dosage and less dosage

Inactive Publication Date: 2020-01-17
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for deep purification of supernatant liquid in zinc hydrometallurgy to remove cadmium and cobalt, so as to solve the problem of large consumption of zinc powder, unstable system, and frequent recombination of cadmium and cobalt in the process of deep purification of supernatant liquid cadmium and cobalt. Dissolution, difficulty in filtration, high production cost, poor production environment, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The flow rate of the supernatant is 160m³ / h, and the main components of the supernatant are determined: Zn: 150g / L, Cu 750mg / L, Cd 530mg / L, Co 40mg / L, Ni 8mg / L, Fe 8mg / L, As 0.1mg / L, Sb 0.1mg / L, Ge 0.1mg / L.

[0053] (1) One-stage purification to remove copper and cadmium:

[0054] Pump the supernatant from the zinc hydrometallurgy into a purification tank, add zinc powder to react, the acidity of the reaction is controlled at pH 4.5, the reaction temperature is controlled at 60°C, the amount of zinc powder added is 2.0kg / m³, and the stirring speed is 76 rev / min, the reaction time is 1.5h. After the reaction is completed, the ore pulp is separated from the solid-liquid by the filter press. The filter residue is copper cadmium residue, and the filtrate is a purified filtrate. The content of Cd in the medium is 95.0mg / L, and the control index of the first-stage purification filtrate is Cd≤100mg / L;

[0055] (2) Two-stage purification to remove cadmium:

[0056] The first...

Embodiment 2

[0066] The flow rate of the supernatant is 160m³ / h, and the main components of the supernatant are determined: Zn: 150g / L, Cu 750mg / L, Cd 530mg / L, Co 40mg / L, Ni 8mg / L, Fe 8mg / L, As 0.1mg / L, Sb 0.1mg / L, Ge 0.1mg / L.

[0067] (1) One-stage purification to remove copper and cadmium:

[0068] Pump the supernatant from the zinc hydrometallurgy into a purification tank, add zinc powder to react, the acidity of the reaction is controlled at pH 5.5, the reaction temperature is controlled at 70°C, the amount of zinc powder added is 4.0kg / m³, and the stirring speed is 85 revs / min, the reaction time is 2.0h. After the reaction is completed, the ore pulp is separated from the solid-liquid by the filter press. The filter residue is copper cadmium residue. The content of Cd in the medium is 72.0mg / L, and the control index of the first-stage purification filtrate is Cd≤100mg / L;

[0069] (2) Two-stage purification to remove cadmium:

[0070] The first-stage purification filtrate is pumped i...

Embodiment 3

[0080] The flow rate of the supernatant is 160m³ / h, and the main components of the supernatant are determined: Zn: 150g / L, Cu 750mg / L, Cd 530mg / L, Co 40mg / L, Ni 8mg / L, Fe 8mg / L, As 0.1mg / L, Sb 0.1mg / L, Ge 0.1mg / L.

[0081] (1) One-stage purification to remove copper and cadmium:

[0082] Pump the supernatant liquid from the zinc hydrometallurgy into a purification tank, add zinc powder to react, the acidity of the reaction is controlled at pH 5.0, the reaction temperature is controlled at 65°C, the amount of zinc powder added is 5.0kg / m³, and the stirring speed is 80 rev / min, the reaction time is 1.5h. After the reaction is completed, the ore pulp is separated from the solid-liquid by the filter press. The filter residue is copper cadmium residue, and the filtrate is a purified filtrate. The content of Cd in the medium is 52mg / L, and the control index of the first-stage purification filtrate is Cd≤100mg / L;

[0083] (2) Two-stage purification to remove cadmium:

[0084] The ...

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Abstract

The invention aims to provide a method for deeply purifying a supernatant and removing cadmium and cobalt in zinc hydrometallurgy. The method comprises the following steps of carrying out purificationand cadmium removal at the first stage, carrying out purification and cadmium removal at the second stage, carrying out purification and cadmium and cobalt removal at the third stage, and carrying out cooling and settling at the fourth stage. The method has the advantages that the deep cadmium and cobalt removal efficiency is excellent, the reaction temperature is low compared with that of a conventional process, so that the steam consumption is low, the cost is low, the usage amount of a purifying agent is small, the utilization rate is high, the cost is cheap, the reaction process is good in stability, the occurrence of the redissolving phenomenon of cadmium and cobalt impurities can be avoided, the amount of generated cobalt slag is small, the cobalt content is high, the subsequent resource utilization is greatly facilitated, the unit consumption of zinc powder in the purification process is remarkably reduced, and secondary pollution is not caused.

Description

technical field [0001] The invention belongs to the technical field of supernatant liquid purification in the zinc hydrometallurgy industry, and in particular relates to a method for deeply purifying supernatant liquid in zinc hydrometallurgy to remove cadmium and cobalt. Background technique [0002] At present, the supernatant purification and removal of cadmium and cobalt in the hydrometallurgy industry at home and abroad mainly include zinc powder replacement (additives) method, β-naphthol purification method, and xanthate purification method, among which zinc powder replacement (addition of antimony salt) method It is currently the most widely used process for removing cadmium and cobalt, but the impurity content in the commercially available zinc concentrate is getting higher and higher, and the traditional purification method is difficult to achieve deep purification of cadmium and cobalt impurities in the supernatant liquid purification process, and the production cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B3/44
CPCC22B19/26Y02P10/20
Inventor 袁武张鸿烈杨斌段宏志胡伟杜虎忠马菲菲江建新崔耀
Owner BAIYIN NONFERROUS GROUP
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