Method for enriching and opening ways for impurities in zinc hydrometallurgy lixivium by means of zinc powder purification slag

A technology of hydrometallurgy and leaching solution, which is applied in the field of non-ferrous metallurgy, can solve problems such as the difficulty in effectively utilizing zinc powder purification slag, and achieve the effects of wide application, simple process, and high recovery rate

Active Publication Date: 2019-02-22
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the zinc powder purification slag is difficult to be effectively utilized in the prior art, the present invention provides a method of using the zinc powder purification slag as a reducing agent to efficiently remove Cu, Cd, Co, Ni and other metals from the acidic zinc leachate through the reverse feeding method. The impurity method, this method can not only remove Cu, Cd, Co, Ni and other impurities in the acidic zinc leaching solution, but also reduce the zinc content in the zinc powder purification slag, and at the same time realize Cu, Cd, Co, Ni and other metals in the zinc The enrichment in powder purification slag is beneficial to the subsequent recovery and treatment of valuable metals. This method has simple process, high recovery rate and low cost, which is conducive to wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] At 50m 3 Add 2.1 tons of zinc powder purification slag (total zinc: 56.45%, metallic zinc: 35.78%, copper: 0.41%, cadmium: 4.35%, nickel: 0.15%, cobalt: 0.22%) and 8.5m into the reactor 3 After the water is stirred and the slurry is uniform, the temperature is raised to 60°C. Then, add the acidic leaching solution (pH=2.9, zinc: 142g / L, copper: 854mg / L, cadmium: 466mg / L, nickel: 15mg / L, cobalt: 36mg / L) preheated to 60℃ and slowly add to In the reactor, the feeding speed is 4.5m 3 / h. After the addition is complete, the temperature keeping reaction is continued for 70 minutes. After the reaction, the residue and the filtrate were collected by filtration, and the concentrations of copper, cadmium, nickel, and cobalt in the filtrate were reduced to <0.1mg / L, 28.2mg / L, 4.7mg / L, 2.3mg / L, which greatly reduces the difficulty of subsequent deep purification. At the same time, the content of these valuable elements in the filter residue rose to 5.63%, 8.85%, 0.38%, 0.24%, respe...

Embodiment 2

[0029] At 50m 3 Add 4.5 tons of zinc powder purification slag (total zinc: 56.45%, metallic zinc: 35.78%, copper: 0.41%, cadmium: 4.35%, nickel: 0.15%, cobalt: 0.22%) and 4.5m into the reactor 3 After the water is stirred into a slurry evenly, the temperature is raised to 45°C. Then, add the acid leaching solution (pH=2.9, zinc: 142g / L, copper: 854mg / L, cadmium: 466mg / L, nickel: 15mg / L, cobalt: 36mg / L) preheated to 55℃ and slowly add to In the reactor, the feeding speed is 6.5m 3 / h. After the addition is complete, continue the heat preservation reaction for 50 minutes. After the reaction, the residue and the filtrate were collected by filtration, and the concentrations of copper, cadmium, nickel, and cobalt in the filtrate were reduced to <0.1mg / L, 2.6mg / L, 1.6mg / L, 0.4mg / L, which greatly reduces the difficulty of subsequent deep purification. At the same time, the content of these valuable elements in the filter residue rose to 2.64%, 3.85%, 0.28%, and 0.11% respectively, la...

Embodiment 3

[0034] At 50m 3 Add 3.2 tons of zinc powder purification slag (total zinc: 56.45%, metallic zinc: 35.78%, copper: 0.41%, cadmium: 4.35%, nickel: 0.15%, cobalt: 0.22%) and 6m into the reactor 3 After the water is stirred and the slurry is uniform, the temperature is raised to 50°C. Then, add the acid leaching solution (pH=2.9, zinc: 142g / L, copper: 854mg / L, cadmium: 466mg / L, nickel: 15mg / L, cobalt: 36mg / L) preheated to 55℃ and slowly add to In the reactor, the feeding speed is 3.5m 3 / h. After the addition is completed, the temperature keeping reaction is continued for 60 minutes. After the reaction, the residue and the filtrate were collected by filtration, and the concentrations of copper, cadmium, nickel, and cobalt in the filtrate were reduced to <0.1mg / L, 6.8mg / L, 3.4mg / L, 0.8mg / L, which greatly reduces the difficulty of subsequent deep purification. At the same time, the content of these valuable elements in the filter residue rose to 3.26%, 4.78%, 0.31%, and 0.22% respec...

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PUM

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Abstract

The invention relates to a method for enriching and opening ways for impurities in zinc hydrometallurgy lixivium by means of zinc powder purification slag. According to the method, after the zinc powder purification slag and water are stirred and pulpified, slurry is heated to 40-65 DEG C; and then zinc hydrometallurgy lixivium with the temperature being 40-65 DEG C is slowly added into the slurry, heat preservation reaction is performed, liquid-solid separation is performed after the reaction is completed, filtrate is purified lixivium, and filter residue is impurity metal enriched slag. By means of the method, copper, germanium, cobalt, nickel and cadmium are replaced into solid elementary substances which are enriched into slag phases, meanwhile, zinc in the zinc powder purification slag is dissolved into a solution as much as possible, thus, the main impurity elements including the copper, germanium, cobalt, nickel and cadmium in the lixivium are removed and enriched, and the zincin the zinc powder purification slag is efficiently utilized. The method has the advantages that the technology is simple, the cost is low, and the valuable metal utilization rate is high and has thegood industrialization application prospects.

Description

Technical field [0001] The invention relates to a method for reusing zinc powder purification slag, in particular to a method for enriching and opening impurities from a hydro-zinc smelting leaching solution by using zinc powder purification slag, and belongs to the field of non-ferrous metallurgy. Background technique [0002] Cu, Cd, Co, and Ni are common impurity elements in the hydrometallurgical zinc leaching solution. These impurity elements have a significant impact on the hydrometallurgical zinc smelting system, especially whether the zinc electrolysis can operate normally. Therefore, the zinc leaching solution enters the zinc electrolysis Before, it needs to carry out multiple impurity removal treatments. At the same time, due to the relatively high content and high value of these impurity elements, their recycling and utilization have attracted much attention from metallurgical workers. [0003] At present, the removal of Cu, Cd, Co, and Ni by the hydro-zinc smelting sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C22B19/32
CPCC22B7/006C22B19/30C22B19/32Y02P10/20
Inventor 徐志峰马艳丽李玉虎曹才放田磊严康李云
Owner JIANGXI UNIV OF SCI & TECH
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