Method for separating lead-silver slag from ferroalumen slag in zinc hydrometallurgy

• Main Authors: ZHANG HONGLIE, SHAO XIA, DUAN HONGZHI, YE YUHUA, FENG WEI, YANG BIN, ZHANG YUCHEN, JIN ZHONG
• Format: Patent
• Language: Chinese; English
• Published: 02.04.2014
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a method for separating lead-silver slag from ferroalumen slag in zinc hydrometallurgy. The method comprises steps of separating preneutralization liquid into preneutralization base flow and preneutralization supernate through liquid-solid separation; adding zinc electrolysis waste liquid or water into the preneutralization base flow for pulping; pumping the pulped ore pulp into a ferroalumen slag decomposing tank; raising temperature and slowly adding concentrated sulfuric acid, wherein the reaction temperature is controlled to be 90 DEG C-100 DEG C, the final concentration of sulfuric acid in the reaction is controlled to be 200-250g/l, and the reaction time is controlled to be 4-5 hours; allowing the obtained ferroalumen slag decomposing ore pulp to enter a filter press for filter pressing so as to obtain filter residue and filtrate; returning the filtrate back to a hydrometallurgical hot acid leaching system, wherein the filter residue is lead-silver slag. According to the method, t