Method for preparing metal copper by electrolytic refining

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...

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,

Images