Method for removing copper, cadmium, nickel and cobalt out of zinc sulfate solution through one step

A zinc sulfate solution and removal technology, applied in the field of hydrometallurgy zinc, can solve the problems of long purification process, high purification cost, low utilization rate, etc., and achieve the effects of high reduction potential, high purification efficiency and high utilization rate

Inactive Publication Date: 2016-06-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, regardless of forward purification or reverse purification, multi-stage operations are required, the purification process is long, and the solution temperature needs to be forced to be adjusted many times, and the energy consumption is high.
In addition, since zinc powder is easily passivated in zinc sulfate solution, its utilization rate is low, resulting in high purification costs

Method used

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  • Method for removing copper, cadmium, nickel and cobalt out of zinc sulfate solution through one step
  • Method for removing copper, cadmium, nickel and cobalt out of zinc sulfate solution through one step
  • Method for removing copper, cadmium, nickel and cobalt out of zinc sulfate solution through one step

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Measure 1.6L of iron removal solution (Zn: 142g / L, Cu: 318mg / L, Cd: 533mg / L, Ni: 15.4mg / L, Co: 13.8mg / L, pH=5.15) in a 2L beaker, Start stirring and heat up to 55°C, then add 160-mesh manganese-copper alloy powder (Mn: 92%, Cu: 8%) according to 3.5 times the total mass of copper and cadmium, and keep it warm for 90 minutes to complete the reaction, vacuum filter and collect Filtrate and filter residue. The concentrations of copper, cadmium, cobalt and nickel in the obtained filtrate are 0.11, 0.16, 0.45 and 0.24mg / L respectively, and the removal rates are all over 98%, which can meet the requirements of the zinc electrolysis process.

[0034] The microscopic morphology and EDS analysis results of manganese-copper alloy powder before and after impurity removal are as follows: figure 1 Shown: by figure 1 a and figure 1 b It can be seen that the morphology of manganese-copper alloy powder has changed greatly before and after impurity removal, from dense particles on the...

Embodiment 2

[0036] Measure 1.6L of iron removal solution (Zn: 142g / L, Cu: 318mg / L, Cd: 533mg / L, Ni: 15.4mg / L, Co: 13.8mg / L, pH=5.15) in a 2L beaker, Start stirring and heat up to 65°C, then add 110-mesh metal manganese powder (Mn:99%) according to 4 times the total mass of copper and cadmium, and keep the reaction for 90 minutes to complete the reaction, vacuum filter and collect the filtrate and filter residue. The concentrations of copper, cadmium, cobalt and nickel in the obtained filtrate are 0.23, 0.21, 0.41 and 0.29 mg / L respectively, and the removal rates are all over 98%, which can meet the requirements of the zinc electrolysis process.

[0037] The microscopic morphology and EDS analysis results of metal manganese powder before and after impurity removal are as follows: figure 2 Shown: by figure 2 a and figure 2 b. It can be seen that the morphology of metal manganese powder has changed greatly before and after impurity removal, from irregular particles with dense surface to...

Embodiment 3

[0039]Measure 1.6L of iron removal solution (Zn: 142g / L, Cu: 318mg / L, Cd: 533mg / L, Ni: 15.4mg / L, Co: 13.8mg / L, pH=5.15) in a 2L beaker, Start stirring and heat up to 50°C, then add 200-mesh manganese-copper alloy powder (Mn: 98%) according to 5 times the total mass of copper and cadmium, and keep the reaction for 140 minutes to complete the reaction. Vacuum filtration and collect the filtrate and filter residue. The concentrations of copper, cadmium, cobalt and nickel in the obtained filtrate are 0.18, 0.14, 0.27 and 0.15 mg / L respectively, and the removal rates are all over 98%, which can meet the requirements of the zinc electrolysis process.

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Abstract

The invention discloses a method for removing copper, cadmium, nickel and cobalt out of a zinc sulfate solution through one step. The method comprises the steps that manganese metal powder and/or manganese-based alloy powder are/is added into the zinc sulfate solution containing copper, cadmium, nickel and cobalt, wherein the temperature of the zinc sulfate solution ranges from 45 DEG C to 70 DEG C, and the pH of the zinc sulfate solution is larger than 4.0; and stirring is carried out for a reaction, after the reaction is finished, filtering separation is carried out, and the zinc sulfate solution with the contents of copper, cadmium, nickel and cobalt all lower than 0.8 ppm is obtained. According to the method, copper, cadmium, nickel and cobalt can be efficiently removed out of the zinc sulfate solution through one step at the same time, no impurities endangering zinc electrolyzing are introduced, the technological process is simple and low in cost, no complex and special equipment is needed, and good industrial application prospects are achieved.

Description

technical field [0001] The invention relates to a method for removing copper, cadmium, nickel and cobalt from zinc sulfate solution in one step, belonging to the field of zinc hydrometallurgy. Background technique [0002] Copper, cadmium, nickel, and cobalt are the main impurity elements in the zinc hydrometallurgy process, and their content in the zinc sulfate solution has a significant impact on the quality of electric zinc products, economic and technical indicators, and the normal operation of the zinc hydrometallurgy system. For example, when the cobalt ion in the zinc sulfate solution exceeds 1mg / L, the current efficiency of the zinc electrolysis system will be reduced, and in severe cases, the burning phenomenon will occur. However, when the copper and cadmium ion content exceeds the standard, the quality of the electrolytic zinc obtained will decline, and qualified 0# zinc products cannot be produced. Therefore, the wet zinc smelting process has extremely strict re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/46C22B19/00
CPCC22B3/46C22B19/00
Inventor 李玉虎刘志宏刘付朋高禄鹏李启厚刘智勇
Owner CENT SOUTH UNIV
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