Method for recovering cadmium from high-cadmium smoke dust

• Main Authors: ZHANG TE, YANG DAJIN, GU LIKUN, LIU JUNCHANG, WANG KUN, ZHAI ZHONGBIAO, MA SHAOBIN, ZOU WEI, LIU DIANCHUAN, LI YUN, MOU XINGBING, QU HONGTAO, FU GUANG, YAN SEN, DIAO WEIZHI, FU WEIQIN
• Format: Patent
• Language: Chinese; English
• Published: 04.03.2022
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for recovering cadmium from high-cadmium smoke dust, and belongs to the non-ferrous metal smelting industry. The high-cadmium smoke dust is subjected to normal pressure-oxygen pressure two-section countercurrent acid leaching, and leaching liquid and lead slag are obtained through liquid-solid separation. And returning the lead slag to a lead smelting system to recover lead. Purifying the leachate to remove arsenic, adding zinc powder to replace and produce sponge cadmium, and further producing crude cadmium and refined cadmium; and after the sulfuric acid solution is supplemented to the first-section post-replacement liquid, returning the first-section post-replacement liquid to oxygen pressure acid leaching, after N times of circulation, carrying out second-section replacement on the last-time first-section post-replacement liquid, returning the second-section post-replacement liquid to a zinc system to recover zinc, and returning the second-section post-replacement liquid t