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Method for leaching zinc from purification copper, cadmium, cobalt and nickel slag of zinc hydrometallurgy

A technology for hydrometallurgical zinc smelting and copper purification, applied in the field of zinc leaching, can solve the problems of long leaching time and low zinc recovery rate, and achieve the effects of low treatment cost, high leaching rate and simple process

Inactive Publication Date: 2016-08-03
WESTERN MINING CO LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] A method for leaching zinc from purified copper-cadmium-cobalt-nickel slag of zinc hydrometallurgy in the present invention is aimed at the problems of low recovery rate of zinc and long leaching time in the leaching process of purified copper-cadmium-cobalt-nickel slag of zinc hydrometallurgy , provide a kind of method for leaching zinc from the purified copper cadmium cobalt nickel slag of hydrometallurgy, make zinc leaching rate reach more than 99.00%, in order to realize this object, the present invention adopts following technical scheme:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 1000g of purified copper, cadmium, cobalt and nickel slag containing 49.10wt% of zinc, the particle size is less than 2mm, and the pulp concentration is 50%, and the ball mill is used for grinding, the ball mill speed is 25r / min, and the grinding time is 5min, and then the purified copper after grinding is obtained. Cadmium cobalt nickel slag slurry;

[0022] The leaching condition of purified copper cadmium cobalt nickel slag slurry after grinding is: temperature 40 o C, the liquid-solid ratio is 3.7:1, adding concentration is 20wt% sulfuric acid to make the terminal pH of leaching solution be 3.30, reaction time 60min, the consumption of potassium permanganate is 0.017 times of purifying copper-cadmium-cobalt-nickel slag quality, agitator speed 300r / min, followed by solid-liquid separation to obtain a zinc-containing leaching solution. The zinc leaching rate of this embodiment is 99.32%, and the zinc concentration in the leach solution is 131.80g / L.

Embodiment 2

[0024] Take 1000g of purified copper, cadmium, cobalt, and nickel slag containing 51.89wt% of zinc, the particle size is less than 2mm, and the pulp concentration is 45%, and the ball mill is used for grinding. The ball mill speed is 25r / min, and the grinding time is 10min, and then the purified copper after grinding is obtained. Cadmium cobalt nickel slag slurry;

[0025] The leaching conditions of the purified copper cadmium cobalt nickel slag slurry after grinding are: temperature 85 o C, the liquid-solid ratio is 4.0:1, adding a concentration of 20wt% sulfuric acid to make the final pH of the leaching solution 3.00, the reaction time is 75min, the amount of potassium permanganate is 0.020 times the quality of the purified copper-cadmium-cobalt-nickel slag, and the stirring speed is 600r / min, followed by solid-liquid separation to obtain a zinc-containing leaching solution. The zinc leaching rate of this embodiment is 99.11%, and the zinc concentration in the leach soluti...

Embodiment 3

[0027] Take 1000g of purified copper, cadmium, cobalt and nickel slag containing 45.37wt% of zinc, the particle size is less than 2mm, and the pulp concentration is 50%, and the ball mill is used for grinding, the ball mill speed is 25r / min, and the grinding time is 5min, and then the purified copper after grinding is obtained. Cadmium cobalt nickel slag slurry;

[0028] The leaching condition of purified copper cadmium cobalt nickel slag slurry after grinding is: temperature 65 o C, the liquid-solid ratio is 3.5:1, the concentration of adding sulfuric acid is 20wt% so that the end point pH of the leachate is 3.50, the reaction time is 90min, the amount of potassium permanganate is 0.015 times of the quality of the purified copper cadmium cobalt nickel slag, and the stirring speed is 450r / min, followed by solid-liquid separation to obtain zinc-containing leaching solution and leaching residue. The zinc leaching rate of this embodiment is 99.20%, and the zinc concentration in...

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Abstract

The invention relates to the technical field of nonferrous metallurgy, in particular to a method for leaching zinc from purification copper, cadmium, cobalt and nickel slag of zinc hydrometallurgy. The method includes the following steps that (1) ore grinding is carried out, wherein the purification copper, cadmium, cobalt and nickel slag with the particle size smaller than 2 mm is placed into a ball mill, during control, the rotating speed of the ball mill is 25 r / min, the ore grinding time ranges from 5.00 min to 10.00 min, the pulp density ranges from 45% to 50%, and ore grinding is carried out; (2) agitation leaching is carried out, wherein sulfuric acid and an oxidizing agent with the using amount 0.015 to 0.02 time the mass of the purification copper, cadmium, cobalt and nickel slag are mixed into the purification copper, cadmium, cobalt and nickel slag processed in the step (1), the liquid-solid ratio (mL / g) is controlled to be 3.5-4.0:1, the leaching temperature ranges from 40 DEG C to 85 DEG C, the leaching time ranges from 60 min to 90 min, the leaching final point pH value ranges from 3.00 to 3.50, then solid-liquid separation is carried out, and leaching liquid and leaching slag which contain zinc are obtained. Compared with the prior art, the method for leaching the zinc from the purification copper, cadmium, cobalt and nickel slag of zinc hydrometallurgy has the beneficial effects that the zinc leaching rate is high and reaches more than 99.00wt%; the production period is short, and the leaching time ranges from 60 min to 90 min; and the process is simple, and the processing cost is low.

Description

technical field [0001] The invention relates to the technical field of nonferrous smelting, in particular to a method for leaching zinc from purified copper, cadmium, cobalt and nickel slag obtained from zinc hydrometallurgy. Background technique [0002] At present, the mainstream process of hydrometallurgy at home and abroad produces copper-cadmium slag in the first stage of purification, and produces cobalt-nickel slag in the second stage of purification. The main method for recovering zinc from copper-cadmium slag and cobalt-nickel slag is to add only dilute Sulfuric acid, control the end point pH value to 3.5~4.0. [0003] Due to technological innovation, there is another new process for the purification and removal of impurities in zinc hydrometallurgy. The first stage of purification produces copper-cadmium-cobalt-nickel slag, and the second-stage purification produces copper-cadmium slag. Among them, the purified copper, cadmium, cobalt and nickel slag contains many...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C22B1/00C22B3/08
CPCC22B1/005C22B3/08C22B7/007C22B19/22Y02P10/20
Inventor 李啊林罗仙平张武董竑君程琍琍
Owner WESTERN MINING CO LTD
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