Technology used for recycling copper from copper nitrate waste liquid

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...

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