Heap-leaching method for separating copper and tin from tin-plated copper wires

Abstract

The invention provides a heap-leaching method for separating copper and tin from tin-plated copper wires, belonging to the recovery processing of waste tin-plated copper wires. The method adopting the copper sulfate replacement / heap-leaching method comprises the following steps: washing and stacking peeled waste tin-plated copper wires on an acid-proof and alkali-proof heap-leaching platform for heap-leaching; pickling the heap-leaching residue with recycling heap-leaching solution, and further washing the pickled heap-leaching residue to obtain detinned copper wires; adding hydrogen peroxideto the heap-leaching solution until no white precipitation is generated, heating the reaction solution until the reaction solution is boiling, standing, filtering, and drying to obtain original stannic acid, and further calcining the original stannic acid to obtain stannic oxide; adding a proper amount of copper powder and blowing air to the filtrate, wherein the addition amount of the copper power is the copper amount required by copper sulfate in the recycling heap-leaching solution; and controlling the temperature and time of the reaction and adjusting the concentrations of copper sulfate and sulfuric acid of the solution by sulfuric acid and water. The method has the advantages that the process is simple and easy-to-operate, the materials and devices are common and cheap, the tin-plated copper wires dispense with stirring in the heap-leaching process, the heap-leaching solution is recyclable and pollution-free, the removal rate of tin is higher than 95%, and the recovery rate of hydrogen peroxide immersion tin is higher than 98%.

Description

technical field [0001] The invention belongs to the recycling treatment of tinned copper wires, in particular to a copper sulfate replacement-heap leaching method for separating copper and tin from tinned copper wires. Background technique [0002] The electronics and communication industries use a large number of tinned copper wires. During the production and use of tinned copper wires, a large amount of waste tinned wires will inevitably be produced. For the treatment of this part of tinned copper wires, except for a part used for production In addition to bronze alloys, for other applications, it is required to remove the tinned layer on the copper wire. The tin content in the tinned copper wire is about 1wt%, and the copper content is above 98%, which has a high recycling value. [0003] At present, fire method, fire electrolysis method, electrochemical method and chemical method are mainly used at home and abroad to recycle tinned copper wire. Chinese invention patent...

AI Technical Summary

Problems solved by technology

However, this method is a conventional chemical method for separating copper and tin, in which the method of stirring must be adopted. Due to the high density of copper, it is difficult to realize large-scale production in industry using the method of stirring, and this method directly replaces tin with copper sulfate , recycle tin (oxide or salt) through follow-up process, there is no copper sulfate replacement liquid regeneration process, because the price of copper sulfate is relatively expensive, the recovery cost is too high, and it is difficult to produce on a large scale

Images