Method for recycling regenerated high-pure copper from metal scraps

Abstract

The invention relates to a method for recycling regenerated high-pure copper from metal scraps. The method comprises the following steps: crushing the metal scraps in advance; soaking the metal scrapswith hydrochloric acid to remove iron which is mixed with the metal scraps; removing zinc which is mixed with the metal scraps by using dilute sulfuric acid; finally, preparing dissolved solutions byadding hydrogen peroxide solutions, salicylic acid and deionized water with the mass concentrations being 27.5 percent into a concentrated sulfuric acid environment, reacting the dissolved solutionswith copper and aluminum in the metal scraps in a heated and oxygenated environment; transforming mixed copper and aluminum elementary substances into copper ions and aluminum ions; adding NaOH in themixed solutions in which the copper ions and the aluminum ions are mixed so that the copper ions are combined with hydroxyl radicals to generate Cu(OH)2 precipitates; and dissolving the Cu(OH)2 precipitate with the dilute sulfuric acid and then performing electrodeposition treatment so as to obtain high-purity copper. The method disclosed by the invention has the advantages that before transformation of liquid phase treatment of ionic state, many kinds of impurity metal which are mostly possibly included in the metal scraps are removed in steps, so that interference caused by the liquid phasereaction and the electrodeposition treatment in the later period is minimized, and the purity of the regenerated copper is greatly improved.

Description

technical field [0001] The invention relates to the field of scrap metal recycling, in particular to a method for recycling high-purity copper from metal scrap. Background technique [0002] In recent years, various countries have paid more and more attention to the sustainability of raw material utilization. The idea of ​​reuse and recycling plays an important role in choosing materials and designing products. If managed properly, recycling has the potential to expand resource utilization and enable Energy consumption, emissions and waste disposal are kept to a minimum, so recycling is increasingly seen as a necessary and beneficial complement to primary metal production. [0003] Copper is not only an ancient metal, but also a modern engineering material full of vigor and vitality. It has good ductility, high thermal and electrical conductivity, so it is often used in cables and electrical and electronic components, and can also be used as a building material . In additi...

AI Technical Summary

Problems solved by technology

In modern industry, the production of metal waste is unavoidable. These metal wastes include copper plating tank slag and sludge, copper waste catalyst, copper etching solution sludge, copper plating sludge, copper-containing waste rock, copper oxidation sludge, etc., if Directly discarding these metal scraps will cause serious heavy metal environmental pollution and waste of resources. Therefore, a method that can recover recycled metal copper from metal scraps is needed

[0004] The traditional copper recovery and regeneration process mostly adopts pyrometallurgy copper smelting. This process can only deal with waste residue with high copper content, and the energy consumption in the recovery and regeneration process is high, which increases the cost of copper recovery and regeneration, and causes serious environmental pollution. The rate is low, and the purity of recycled copper is poor