Method and device for harmless treatment of recycled copper oxychloride

The invention discloses a method and device for harmless treatment of recycled copper oxychloride. The method includes: (1) adding acid into recycled copper oxychloride for dissolution; (2) transferring the feed liquid into a first-stage reaction kettle, and introducing hydrogen sulfide gas for reaction with metal ions in the feed liquid to generate precipitate; (3) discharging the materials fromthe first-stage reaction kettle for filter pressing, treating the filter residue as copper concentrate to recover valuable metal elements therein, putting the filtrate into a second-stage reaction kettle, introducing hot air, and converting fluorine and chlorine elements in the feed liquid into hydrogen fluoride and hydrogen chloride gas; and (4) guiding the hydrogen fluoride and hydrogen chloridegas generated by the second-stage reaction kettle into a first-stage absorption tower, spraying water to absorb hydrogen fluoride and hydrogen chloride gas, guiding unabsorbed tail gas into a second-stage absorption tower, an