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Method for precipitating sponge copper powder through zinc-ammonia-ammonium salt solution system displacement

An ammonium salt solution and sponge technology, applied in the field of copper sponge deposition, can solve the problems of low current efficiency, complex equipment, and difficult operation of electrodeposited copper, and achieve high copper removal efficiency, reduced zinc consumption, and less impurities.

Inactive Publication Date: 2017-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The current efficiency of electrodeposited copper is low; therefore, it is necessary to use diaphragm electrodeposition to improve the current efficiency, resulting in complex equipment and difficult operation

Method used

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  • Method for precipitating sponge copper powder through zinc-ammonia-ammonium salt solution system displacement
  • Method for precipitating sponge copper powder through zinc-ammonia-ammonium salt solution system displacement
  • Method for precipitating sponge copper powder through zinc-ammonia-ammonium salt solution system displacement

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1. Using recycled brass smelting slag from a factory as raw material, 5mol / L ammonium chloride and 2mol / L ammonia solution are used as leaching agents, and the chemical composition (g / L) of the leaching solution is: Zn 2+ 57.87, Cu 2+ +Cu + 14.71, Ni 2+ 0.04, Co 2+ 0.05, Pb 2+ 0.01. Get this material liquid 2000ml and be placed in the reaction tank of 2500ml, length 20cm, width 10cm, the zinc plate of thickness 1mm is anode, length 24cm, width 14cm, the titanium plate of thickness 2mm is cathode.

[0035] 2. Put the reaction tank into a 35°C water bath, connect the zinc plate to the positive pole of the DC power supply, and connect the titanium plate to the negative pole of the DC power supply.

[0036] 3. Adjust the current density on the zinc plate to 200A / m 2 , the distance between the zinc plate and the titanium plate is 10cm, the potential difference between the zinc plate and the titanium plate is 0.46V, and the solution contains Cu 2+ 0.18g / L, the grade of...

Embodiment 2

[0044] 1. Using a factory's recycled brass smelting slag as raw material, using 5mol / L ammonium chloride solution as leaching agent, the chemical composition (g / L) of the leaching solution is: Zn 2+ 114.5, Cu 2+ +Cu + 6.76, Ni 2+ 0.06, Co 2+ 0.045, Sb 3+ 0.01, Cd 2+ 0.01, Pb 2+ 0.02. Take 2000ml of this feed solution and place it in a 2500ml reaction tank. A zinc plate with a length of 20cm, a width of 10cm, and a thickness of 1mm is used as the anode, and a titanium mesh with a length of 22cm, a width of 12cm, and a thickness of 2mm is used as the cathode. The anode and the cathode are polished smooth with sandpaper.

[0045] 2. Put the reaction tank into a 70°C water bath, connect the zinc plate to the positive pole of the DC power supply, and connect the titanium mesh to the negative pole of the DC power supply.

[0046] 3. Adjust the current density on the zinc plate to 70A / m 2 , the distance between the zinc plate and the titanium mesh is 5cm, the potential differ...

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Abstract

The invention discloses a method for precipitating sponge copper powder through zinc-ammonia-ammonium salt solution system displacement. The method comprises the following steps: immersing a zinc anode and a cathode in a copper ion-containing zinc-ammonia-ammonium salt solution, powering the anode and the cathode by a direct current to carry out a displacement reaction, and carrying out solid-liquid separation to obtain the sponge copper powder. Compared with a method simply using the zinc powder to displace copper, the method disclosed in the invention has the advantages of promotion and acceleration of the displacement process by the direct current, great increase of the replacement efficiency, great reduction of the use amount of zinc, and reduction of the cost. Compared with copper resides obtained through traditional zinc powder displacement, the sponge copper powder obtained in the invention has the advantages of no zinc wrapping, high purity and few impurities. A solution obtained after the displacement can be used in the electrodeposition of a metal zinc plate after being deeply purified. The method is simple, and the obtained sponge copper powder has high purity, and can be used for producing brass; and the method can be combined with a zinc metallurgical process to facilitate the industrial production.

Description

technical field [0001] The invention discloses a method for depositing sponge copper, in particular to a method for displacing and depositing sponge copper powder from a zinc-ammonia-ammonium salt solution system through a combination of chemical and electrochemical methods, and belongs to the technical field of hydrometallurgy. Background technique [0002] Copper is a non-ferrous metal closely related to human beings. It is widely used in electrical, light industry, machinery manufacturing, construction industry, defense industry and other fields. It is second only to aluminum in the consumption of non-ferrous metal materials in China. The slag ash produced by pyro-recycling copper contains high zinc and copper. In order to meet the requirements of zinc electrowinning, it is necessary to remove impurities from the solution and recover copper at the same time. [0003] Common copper removal (copper recovery) methods from zinc leaching solutions include zinc powder replaceme...

Claims

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Application Information

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IPC IPC(8): C25C5/02C22B15/00
CPCC01P2002/72C22B15/0091C25C5/02
Inventor 杨声海黄星龙陈永明何静唐朝波杨建广杨声荣
Owner CENT SOUTH UNIV
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