A kind of method for reclaiming copper and nickel from copper-nickel-based alloy scrap

Abstract

The invention relates to a method for recovering copper and nickel from copper-nickel based alloy waste, and belongs to the technical field of comprehensive utilization of resources. The method comprises the following steps of: heating the copper-nickel based alloy waste to reach a molten state, and then casting to form a soluble anode plate; electrolyzing with the soluble anode plate as an anode, a stainless steel plate as a cathode, and copper sulfate as electrolyte until the concentration of copper ion in the electrolyte is reduced to 5 to 30g / L, thus obtaining copper on the cathode; recycling the obtained electrolyte to cyclone electrodeposition, namely, performing electrodeposition with an insoluble iridium film as an anode and an annular titanium plate as a cathode until the concentration of copper ion in the electrolyte reaches 1 to 5g / L, thus obtaining copper on the cathode; performing nickel electrodeposition by using the obtained copper-free electrolyte as the electrolyte, lead anode composite plate as an anode and another stainless steel plate as a cathode, thus obtaining nickel on the cathode after the cathode electrodeposition cycle is ended. The method enables the anode plate casting process and the alloy structure breaking process to be coupled and integrated, thus the energy-saving effect of the process is remarkable.

Description

technical field [0001] The invention relates to a method for recycling copper and nickel from copper-nickel-based alloy waste, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] China's nickel supply consists of two parts, one part is the supply of newly produced nickel concentrate, which accounts for 72.9% of the total nickel supply, and the other part comes from secondary nickel, accounting for 27.1%. With the development of economic construction and steel industry, nickel's The demand is constantly increasing. After China's nickel consumption is expected to reach 400,000 tons per year in 2010, China will become the world's largest nickel consumer. In 2010, the basic reserves of nickel metal in China were only about 2.3 million tons. From 2010 to 2013, there was no significant progress in China's nickel ore exploration. If consumption continues like this, China's nickel ore resources will gradually be exhausted in 1...

AI Technical Summary

Problems solved by technology

In the process of electrolytic refining of copper in this method, in order to prevent the electrolysis of nickel, it is necessary to supplement Cu intermittently. 2+ , so that the electrolyte Cu 2+ The ion concentration is maintained at 20-80g / L, and the Cu in the electrolyte must be removed before electrodeposition of nickel 2+ removed, so the process is more complicated and cumbersome, and the purity of the copper and nickel products finally obtained is not high

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