Method for extracting copper from organic silicon chemical waste residue leaching liquid of chloride and mixed salts containing copper

Abstract

The invention selects oxalic acid solution to act as the precipitating agents of organosilicon chemical industry waste slag leachate of copper chlorate or mixture salt system, after filtering, washing and drying of the process residue of copper oxalic acid, heat decomposition in oxidizing atmosphere and at the temperature of 500~900 centigrade, the production of copper oxide is obtained by product yield cool-down. The yield acid of oxalic acid precipitation process is retuned organosilicon chemical industry waste slag leachate system to act as infusion. After the heat decomposition copper oxide dissolves in sulphuric acid, the solution can be used in electrodepositing cathode copper or regenerating copper sulphate, also can be used to produce cathode copper by copper electrodepositing solution dissolution regeneration electrodeposition, also sell as commercial copper oxide.

Description

technical field [0001] The invention relates to a method for extracting copper from an organosilicon chemical industry waste leaching solution containing copper chloride salt or mixed salt, belonging to the regeneration category of inorganic fine chemicals. Background technique [0002] Organosilicon chemical waste residues such as "waste main body" and "waste residue slurry residue" can easily leach copper in the acidic solution with oxidants. Alternative oxidants include oxygen, chlorine, sodium hypochlorite, sodium chlorate, and nitric acid. etc. Most of the leaching agents used are sulfuric acid or hydrochloric acid. Due to the use of different oxidants and acid systems, different types of leachate systems can be obtained by leaching, which can be pure sulfate system or pure chloride salt system or a mixed salt system of the two. The extraction of copper from the sulfate system has been described in Chinese Patent No. CN92110582.7. It is worth noting that the leaching t...

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Problems solved by technology

Chinese Patent No. CN200480004054.X and Chinese Patent No. CN92113655.2 both relate to the method of extracting copper from the chloride salt system. The former directly produces cathode copper by electrowinning chlorine salt, but the requirements for the anode used are relatively high, and chlorine gas is generated during the process; The obtained replacement copper is still the primary product of copper

Extraction of copper from the mixed salt system of copper (referring to the mixed salt system containing sulfate, chloride and nitrate), the replacement method is mostly used at present, and the liquid after replacement of this method is difficult to handle

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