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A method for preparing metallic copper by electrolytic refining

A technology of electrolytic refining and metal copper, which is applied to the improvement of process efficiency, instruments, optics, etc., and can solve the problems of low product qualification rate, high copper content requirements, low impurity content requirements, etc.

Active Publication Date: 2021-05-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, on the one hand, in order to obtain high-quality cathode copper products, copper sulfate is often used as the electrolyte to electrolyze the copper anode, and the electrolysis process has strict requirements on the anode plate, and the general industry stipulates that the main grade is Cu98.5%~ 99.5%, impurity Ni≤0.30%, As≤0.20%, Sb≤0.10%, Bi≤0.03%, Pb≤0.20%, the requirements for copper content in the anode are high, and the requirements for impurity content are low, and further processing of raw materials is required As an anode, there are problems such as low product qualification rate, high impurity content, and serious environmental pollution.
On the other hand, the copper in the traditional electrolysis industrial anode enters the electrolyte in the form of divalent copper ions in the electrolyte, resulting in low current efficiency of the electrolysis process,

Method used

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  • A method for preparing metallic copper by electrolytic refining
  • A method for preparing metallic copper by electrolytic refining
  • A method for preparing metallic copper by electrolytic refining

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] (1) 5mol of choline chloride is mixed with 5mol of ethylene glycol to obtain a low co-solvent, and 0.05mol / L of copper chloride is added, and after mixing, an electrolyte is prepared;

[0048] (2) the scrap copper that comprises 58% copper, 40.2% zinc, 0.5% lead, 0.5% nickel, 0.3% iron and 0.2% tin by mass fraction meter is used as anode, and pure copper sheet is used as cathode, through Enter direct current for electrolysis, control the electrolysis temperature to 42°C, and the current density to 100A / m 2 , and the cathode metal copper is obtained after electrolysis. The morphology of cathode metal copper is as follows Figure 4 shown. The product obtained from the cathode is copper powder, which has a small particle size and can form a flat and dense copper layer.

example 2

[0050] (1) The benzyltriethylammonium chloride of 5mol is mixed with the glycerol of 28mol to obtain a low co-solvent, and the cupric chloride of 0.1mol / L is added, and an electrolyte is prepared after mixing;

[0051] (2) the blister copper that comprises 99% copper, 0.02% zinc, 0.01% lead, 0.03% nickel and 0.01% tin by mass fraction meter is used as anode, and pure copper sheet is used as cathode, and feeds direct current and carries out electrolysis, Control the electrolysis temperature to 80°C and the current density to 200A / m 2 , and the cathode metal copper is obtained after electrolysis. Figure 5 with Image 6 are the XRD and SEM images of the obtained cathode metal copper, respectively. XRD shows that the obtained metallic copper is of high purity, and scanning electron microscopy shows that the product is copper powder with a small particle size and can form a flat and dense copper layer.

example 3

[0053] (1) The betaine hydrochloride of 5mol is mixed with the glycerol of 15mol to obtain a low co-solvent, and the cupric chloride of 0.02mol / L is added, and an electrolyte is prepared after mixing;

[0054] (2) the blister copper that mass fraction meter comprises 69% copper, 21% zinc, 3.6% lead, 2.7% nickel, 1.5% iron and 1.6% tin is as anode, pure copper sheet is as cathode, passes into Conduct electrolysis with direct current, control the electrolysis temperature to 62°C, and the current density to 50A / m 2 , and the cathode metal copper is obtained after electrolysis. The morphology of the obtained cathode metal copper is as follows Figure 7 As shown, the cathode metallic copper presents a dendritic feather.

[0055] In summary, the method of the present invention can realize the discharge of monovalent copper ions, can significantly reduce the energy consumption in the electrolytic refining process, and the method of the present invention has a short operation proces...

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Abstract

The invention provides a method for preparing metallic copper by electrolytic refining. The method comprises the following steps: uniformly mixing polyhydric alcohol or amide and quaternary ammonium salt according to the molar ratio of 1 to 6:1, adding cuprous salt, and obtaining electrolytic copper after mixing. Liquid, wherein, the molar concentration of the cuprous salt is 0.02mol / L~0.05mol / L, and the quaternary ammonium salt is a quaternary ammonium salt containing chloride ions; with crude copper and scrap copper as the anode, the pure copper sheet As the cathode, in the electrolyte and control the temperature at 40°C to 80°C, the current density is 50A / m 2 ~200A / m 2 Electrolysis is carried out under certain conditions to obtain metallic copper. The method of the invention can significantly reduce energy consumption in the electrolytic refining process, has short operation flow, is environmentally friendly, and can prepare metal copper with high purity.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal preparation, and more specifically relates to a method for preparing metallic copper by electrolytic refining. Background technique [0002] Copper is a non-ferrous metal that is very closely related to human beings. It is widely used in electrical, light industry, machinery manufacturing, construction industry, national defense industry and other fields, especially in the electrical industry and electronic industry. second only to aluminum in consumption. The purity of copper has a great influence on its properties, and trace impurities will also have a great impact on the performance of copper. [0003] In the existing technology, on the one hand, in order to obtain high-quality cathode copper products, copper sulfate is often used as the electrolyte to electrolyze the copper anode, and the electrolysis process has strict requirements on the anode plate, and the general industry stipul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/12
CPCC25C1/12Y02P10/20
Inventor 徐存英唐杰华一新张启波汝娟坚李艳李坚
Owner KUNMING UNIV OF SCI & TECH