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Method for directly producing electric zinc by utilizing zinc hypoxide

A sub-zinc oxide, direct technology, applied in the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of large investment, high operating cost, long process flow, etc., to achieve short process flow, easy operation and control, and avoid loss. Effect

Inactive Publication Date: 2021-03-19
SHAANXI ZINC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main methods for removing fluorine and chlorine from the leachate include adding fluorine-removing agent and chlorine-removing agent method, extraction method, goethite method, etc. Due to different raw materials, the processes adopted by each factory are not the same, but the above methods all have a process flow Disadvantages of length, large investment, and high operating costs

Method used

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  • Method for directly producing electric zinc by utilizing zinc hypoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. Neutral leaching: Take 4L of electrolytic waste liquid from the company's wet zinc smelting system, add 1000g of secondary zinc oxide, do not heat (the reaction will naturally exotherm), stir the reaction until the end point pH is 5.4, filter to obtain the middle immersion liquid, and middle leaching The liquid composition is Zn158.66g / l, Fe1.84g / l, As0.074g / l, Sb0.018g / l, Cu0.0036g / l, Cd0.25g / l, Co0.00091g / l, Ni0.00096g / l l, Mn4.25g / l, F0.067g / l, Cl0.83g / l.

[0021] b. Copper slag dechlorination: Add 190g of copper slag (produced in the comprehensive recovery process, stockpiled and naturally oxidized for 3 days) in the obtained infusion solution, add electrolytic waste liquid to adjust the pH to pH1.5, and the reaction temperature is 55°C. After 1 hour, filter to obtain the dechlorinated liquid. The components of the dechlorinated liquid are Zn161.25g / l, Cu1.22g / l, Cd0.72g / l, Co0.0014g / l, Ni0.0049g / l, Mn4.38g / l, F0.065g / l, Cl0.10g / l.

[0022] C, neutralization: ...

Embodiment 2

[0028] a. Neutral leaching: Get 4L of the electrolytic waste liquid of Example 1, add 900g of zinc oxide, do not heat (reaction naturally exothermic), stir the reaction to the end point pH5.2, filter to obtain the middle immersion liquid, the middle immersion liquid composition is containing Zn159.74g / l, Fe2.02g / l, As0.094g / l, Sb0.026g / l, Cu0.0029g / l, Cd0.41g / l, Co0.00095g / l, Ni0.00084g / l, Mn4. 68g / l, F0.078g / l, Cl1.26g / l.

[0029]b. Copper slag dechlorination: Add 220g of copper slag (produced in the comprehensive recovery process, stockpile and naturally oxidized for 4 days) in the obtained infusion solution, add electrolytic waste liquid to adjust to pH2.5, reaction temperature 58 ° C, reaction 1 hours, filtered to get the dechlorinated liquid, the dechlorinated liquid part composition is Zn160.86g / l, Cu1.44g / l, Cd0.78g / l, Co0.0019g / l, Ni0.0064g / l, Mn4.62g / l l, F0.076g / l, Cl0.15g / l.

[0030] c. Neutralization: add 16g of manganese carbonate to the obtained dechlorinated l...

Embodiment 3

[0036] a. Neutral leaching: Take 40m of electrolytic waste liquid from the company's hydrometallurgy system 3 , add 10 tons of secondary zinc oxide, without heating (the reaction is naturally exothermic), stir the reaction to the end point pH5.4, filter to obtain the infusion solution, the infusion solution composition is containing Zn162.45g / l, Fe1.66g / l, As0 .063g / l, Sb0.031g / l, Cu0.0029g / l, Cd0.34g / l, Co0.00097g / l, Ni0.00076g / l, Mn3.92g / l, F0.072g / l, Cl1.03g / l.

[0037] b. Copper slag dechlorination: Add 1.5 tons of copper slag (produced in the comprehensive recovery process, stored for 2 days for natural oxidation) in the obtained infusion solution, add electrolytic waste liquid to adjust to pH3.0, reaction temperature 58 ° C, reaction 1 hours, filtered to get the dechlorinated liquid, the dechlorinated liquid part components are Zn162.95g / l, Cu0.89g / l, Cd0.52g / l, Co0.00087g / l, Ni0.00098g / l, Mn3.94g / l l, F0.074g / l, Cl0.14g / l.

[0038] c. Neutralization: Add 160kg of ma...

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Abstract

The invention relates to a novel method for directly producing electric zinc by utilizing zinc hypoxide, and belongs to the field of non-ferrous metallurgy zinc hydrometallurgy. The method comprises the following steps: a, neutral leaching; b, dechlorinating of copper slag; c, neutralizing; d, primary purification; e, oxidizing with hydrogen peroxide for iron removal; f, secondary purification; and g, electrolysis, wherein the obtained secondary purified liquid is a pure zinc sulfate solution, and a cathode zinc sheet with the Zn content larger than or equal to 99.99% is produced after conventional electrolysis. The zinc hypoxide does not need to be subjected to smoke dust pretreatment to remove fluorine and chlorine, and can be directly leached to produce electric zinc. The process flow is short, investment is low, and the production cost is low; manganese carbonate and boiler dust are used as neutralizers for neutralizing dechlorinated liquid, so that the cost of auxiliary materialsis saved, and introduction of other impurities such as chlorine is avoided; conventional operation of iron removal first and then multi-stage purification is changed, the method is organically combined with a conventional leaching process of zinc hydrometallurgy, and the technical problems that in the conventional leaching process of zinc hydrometallurgy, the comprehensive recycling process flow of rotary kiln secondary zinc oxide is long, and investment is large are solved.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgical hydrometallurgy zinc smelting, in particular to a method for producing electric zinc by direct leaching, purification and electrolysis of secondary zinc oxide in zinc smelting production. Background technique [0002] For hydro-method zinc smelting enterprises, secondary zinc oxide is difficult to be directly used as a raw material for leaching systems in hydro-method zinc smelting systems due to high impurities such as fluorine (F) and chlorine (Cl). Secondary zinc oxide mainly includes: secondary zinc oxide produced by the dust collection system of the rotary kiln in the conventional leaching process of zinc hydrometallurgy, and secondary zinc oxide produced by the dust collection system of the lead smelting fuming furnace and the blast furnace of the steel plant. The main feature of secondary zinc oxide is that in addition to containing a relatively high amount of metal zinc (Z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/20C25C1/16C22B15/00
CPCC22B7/006C22B7/02C22B19/20C22B19/26C25C1/16C22B15/0063Y02P10/20
Inventor 何学斌崔旭东张健康牛勤学周冲冲周玺马高峰郭宁寇文利
Owner SHAANXI ZINC IND