A kind of technology that recovers copper from copper nitrate waste liquid

A technology of copper nitrate and copper recovery, applied in the field of electrochemical applications, can solve the problems of large energy consumption, burning of conductive copper rods or electroplating equipment, and yellow smoke of nitrogen oxides, so as to reduce ammonia nitrogen emissions, avoid overheating and burning, and save material costs Effect

Active Publication Date: 2018-05-01
深圳市京中康科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to obtaining copper sulfate crystals, this method can additionally collect nitric acid solution through condensing equipment, but the above method requires heating and cooling crystallization, and the process requires a lot of energy consumption
At the same time, there are still the following difficulties in recovering copper from the copper nitrate waste liquid: the solution has high acidity and strong oxidation, and there is serious anti-corrosion phenomenon during electrolysis. If the control is not good, it is easy to corrode the anode, and the corrosion process is an exothermic process. As the temperature in the electrolytic tank gradually rises, toxic nitrogen oxide yellow smoke will even be produced, and in more serious cases, the conductive copper rod or electroplating equipment will even be burned

Method used

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Examples

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Effect test

Embodiment 1

[0022] The present embodiment provides a kind of technique that reclaims copper from copper nitrate waste liquid, and it comprises the steps:

[0023] a, adding molar concentration in copper nitrate waste liquid is the sulfate of 0.01mol / L, the mass ratio of described sulfate and described copper nitrate waste liquid is 1:5, and described sulfate is inorganic sulfate, this implementation In an example, the inorganic sulfate is potassium aluminum sulfate, and when potassium aluminum sulfate is added, stirring is carried out, the stirring speed is 10r / min, and the circulation volume is 10L / min;

[0024] b. Add alkaline neutralizing solution to the solution obtained in step a, adjust the acidity value of the solution to 0.1N, and start electrolysis at a voltage of not less than 12V, and the current density during electrolysis is 180A / m 2 . The alkaline neutralizing solution is an inorganic base. In the present embodiment, the inorganic base is ammonium carbonate with a concentra...

Embodiment 2

[0026] The present embodiment provides a kind of technique that reclaims copper from copper nitrate waste liquid, and it comprises the steps:

[0027] A, adding molar concentration in copper nitrate waste liquid is the sulfate of 0.5mol / L, and the mass ratio of described sulfate and described copper nitrate waste liquid is 1:45, and described sulfate is inorganic sulfate, this implementation In example, described inorganic sulfate is the mixture of potassium sodium sulfate, sodium ammonium sulfate, and wherein, described potassium sodium sulfate accounts for the mass percent of described mixture and is 50%, when adding potassium sodium sulfate, sodium ammonium sulfate, carry out circulation stirring, The stirring speed is 50r / min, and the circulation volume is 250L / min;

[0028] b. Add alkaline neutralizing solution to the solution obtained in step a, adjust the acidity value of the solution to 2.5N, and start electrolysis at a voltage not lower than 12V, and the current densi...

Embodiment 3

[0030] The present embodiment provides a kind of technique that reclaims copper from copper nitrate waste liquid, and it comprises the steps:

[0031] a, adding molar concentration in copper nitrate waste liquid is the sulfate of 0.15mol / L, and the mass ratio of described sulfate and described copper nitrate waste liquid is 1:25, and described sulfate is inorganic sulfate, this implementation In an example, the inorganic sulfate is a mixture of potassium sulfate and magnesium sulfate, wherein the potassium sulfate accounts for 45% by mass of the mixture, and when potassium sulfate and magnesium sulfate are added, the stirring speed is 50 rpm. / min, the circulation volume is 250L / min;

[0032] b. Add alkaline neutralizing solution to the solution obtained in step a, adjust the acidity value of the solution to 1N, and start electrolysis at a voltage not lower than 12V, and the current density during electrolysis is 250A / m 2 . The alkaline neutralizing solution is a mixture of ...

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PUM

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Abstract

The invention discloses a technology used for recycling copper from copper nitrate waste liquid. The technology used for recycling copper from the copper nitrate waste liquid comprises the following steps of (a) adding sulfate at a molar concentration of 0.01-0.5mol / L in the copper nitrate waste liquid; and (b) adding an alkaline neutralization solution in the solution of the step (a), adjusting the acidity value of the solution to 0.1-2.5N, and electrolyzing the solution at a voltage not lower than 12V. According to the technology, the components of the copper nitrate waste liquid can be adjusted for reducing the acidity of the solution by adding the sulfate electrolysis additive agent and the alkaline neutralization solution in the copper nitrate waste liquid and at the same time the oxidation potential of the copper nitrate solution to be electrolyzed can be reduced and the stability of the solution during electroplating can be improved; the electrolytic potential can be effectively enabled to be higher than the corrosion potential by the coordination of special electrolyzing parameters, so that the occurrence probability of ''reverse corrosion'' can be reduced; and the copper nitrate waste liquid of which copper is electrolyzed can return to the corresponding process for adjusting and then be recycled after the copper ions are decreased to a certain degree, so that the economy and environmental protection can be realized.

Description

technical field [0001] The invention belongs to the technical field of electrochemical application, in particular to a process for recovering copper from copper nitrate waste liquid. Background technique [0002] Electroplating is a process of plating a thin layer of other metals or alloys on the surface of certain metals by using the principle of electrolysis. It is a process of attaching a layer of metal film to the surface of metals by electrolysis. Conductivity, reflectivity, etc. A large amount of copper nitrate waste liquid is produced in the field of electroplating. For example, many copper parts usually need acid leaching to remove oxides on the surface of copper parts before cyanide gold plating and silver plating. In actual production, acid leaching liquid based on nitric acid is often used. In addition, often also adopt nitric acid to clean the copper accumulated on the surface of the electroplating rack, thus producing a large amount of copper nitrate waste liqu...

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 张建军周京萍何国雄
Owner 深圳市京中康科技有限公司
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