Method for preparing metal copper by electrolytic refining

A technology of electrolytic refining and metal copper, which is applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems of high copper content, environmental pollution, high impurity content, etc., and achieve short operation process, low energy consumption, and environmental friendliness Effect

Active Publication Date: 2019-12-31
KUNMING UNIV OF SCI & TECH
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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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  • Method for preparing metal copper by electrolytic refining
  • Method for preparing metal copper by electrolytic refining
  • Method for preparing metal 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 metal copper by electrolytic refining. The method comprises the following steps: uniformly mixing polyol or amide and quaternary ammonium salt in a molarratio of 1-6:1, adding cuprous salt, and mixing the materials to obtain an electrolyte, wherein the molar concentration of the cuprous salt is 0.02 mol / L-0.05 mol / L, and the quaternary ammonium salt is quaternary ammonium salt containing chloride ions; performing electrolysis in the electrolyte under the conditions that the temperature is controlled at 40-80 DEG C and current density is 50-200 A / m<2> to obtain metal copper with crude copper and waste miscellaneous copper taken as an anode and pure copper sheets taken as a cathode. The method can obviously reduce energy consumption in the electrolytic refining process, has short operation flow and is environmentally friendly, and metal copper with higher purity can be prepared.

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 Applications(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
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