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Method for electrowinning copper nitrate solution

A technology of copper nitrate and solution, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of remelting, difficult to adopt, and no successful research reports, etc., and achieve the effect of low cost and short path

Inactive Publication Date: 2009-03-25
SIHUI CITY HONGMING PRECIOUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Electrowinning is carried out directly from the nitric acid system. Because of the corrosiveness of nitric acid, it is difficult to use due to the strong corrosion of the insoluble anode and the strong corrosion of the cathode copper.
[0004] There is no successful research report on the electrowinning of nitric acid system at home and abroad.

Method used

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  • Method for electrowinning copper nitrate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] with attached figure 1 The shown equipment handles copper nitrate solution and operates as follows:

[0025] ①Use a titanium-coated electrode plate as the insoluble anode, and use a stainless steel plate as the cathode. Electrolyzer 1 is installed.

[0026] ② Concentrate the copper nitrate solution to 120 g liters and add it to the electrolytic cell 1.

[0027] ③Start work. Electrowinning conditions: temperature: ≤32°C, current density 200A / h.

[0028] ④ Take out the copper nitrate solution at one end of the electrolytic cell 1, introduce it into the gas blowing tank 4, and then introduce the copper nitrate solution from the gas blowing tank 4 to the other end of the electrolytic cell 1 to form a cycle. The rate of circulation is 8 times the total amount of electrolyte per hour. The blower 5 blows air into the blowing pool, and the blowing air volume is 50 times the volume of the electrolyte per hour. A nitric acid collector 3 is arranged above the blowing tank to...

Embodiment 2

[0034] with attached figure 1 The shown equipment handles copper nitrate solution and operates as follows:

[0035] ①Use a titanium-coated anode as the insoluble anode, and use a stainless steel plate as the cathode. Electrolyzer 1 is installed.

[0036] ② Concentrate the copper nitrate solution to 120 g liters and add it to the electrolytic cell 1.

[0037] ③Start work. Electrowinning conditions: temperature: ≤32°C, current density 250A / h.

[0038] ④ Take out the copper nitrate solution from one end of the electrolytic cell 1, introduce it into the gas blowing tank 4, and then introduce the copper nitrate solution from the gas blowing tank 4 to the other end of the electrolytic cell 1 to form a cycle. The rate of circulation is 4 times the total amount of electrolyte per hour. Air is blown into the blowing tank 4 by the blower 5, and the blowing air volume is 5 times of the electrolyte volume per hour. A nitric acid collector 3 is arranged above the blowing tank 4 to co...

Embodiment 3

[0044] with attached figure 1 The shown equipment handles copper nitrate solution and operates as follows:

[0045] ①Use a titanium-coated anode as the insoluble anode, and use a stainless steel plate as the cathode. Electrolyzer 1 is installed.

[0046] ② Concentrate the copper nitrate solution to 120 g liters and add it to the electrolytic cell.

[0047] ③Start work. Electrowinning conditions: temperature: ≤32°C, current density 300A / h.

[0048] ④ Take out the copper nitrate solution at one end of the electrolytic cell 1, introduce it into the gas blowing tank 4, and then introduce the copper nitrate solution from the gas blowing tank 4 to the other end of the electrolytic cell 1 to form a cycle. The rate of circulation is 0.5 times the total amount of electrolyte per hour. Air is blown into the blowing pool 4 by the blower 5, and the blowing air volume is 30 times the volume of the electrolyte per hour. A nitric acid collector 3 is arranged above the blowing tank 4 to...

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Abstract

The invention relates to an electro-winning method of cupric nitrate solution. The invention relates to an electro-winning method by which the cupric nitrate solution produced by the wet-process metallurgy of precious metal is directly electrolyzed to reclaim the copper and nitric acid. The method adopts a titanium coating electrode plate as the anode and adopts stainless steel as the cathode to electrolyze the cupric nitrate solution in an electrolytic tank directly. During the electrolytic process, the cupric nitrate electrolytic solution is led into a blowing tank and the flow forms a circulation; air or nitrogen is blown into the cupric nitrate solution in the blowing tank to remove the nitrogen dioxide gas in the solution. The cupric nitrate electrolytic solution is led into a vacuum separation chamber and the flow forms a circulation; the pressure is reduced to separate the nitric acid in the solution to keep the nitric acid concentration of the electrolytic solution between 40g / L to 80g / L. The electro-winning method can efficiently solve the problem of corrosivity of the nitric acid during the process of nitric acid system electro-winning, thereby achieving the purpose of protecting the anode and preventing the cathode from back-dissolving; therefore, the direct electro-winning of the cupric nitrate can be carried out continuously.

Description

technical field [0001] The invention relates to an electrowinning method for recovering copper and nitric acid in the copper nitrate solution produced by hydrometallurgy of precious metals. Background technique [0002] In the process of precious metal smelting, copper nitrate solution is inevitably produced in the wet process. There are two common ways to recover copper from copper nitrate solution, one is to replace copper with base metal, and waste liquid is discarded after treatment. Another method is to convert the sulfuric acid system into a sulfuric acid system by extraction or nitrate removal, and then recover the copper in it by electrowinning. [0003] It is difficult to use the nitric acid system for electrowinning directly because of the corrosiveness of nitric acid, strong corrosion of insoluble anodes and remelting of cathode copper. [0004] There is no successful research report on the electrowinning of nitric acid system at home and abroad. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12
CPCY02P10/20
Inventor 殷国民江继明
Owner SIHUI CITY HONGMING PRECIOUS METALS
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