Method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud

• Main Authors: HU RUOPENG, HUANG KAI, WANG XIAOLI, LI ZHEN, HE ZONGLIANG, YANG XUE, XING JIE, SUN KEYUAN
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2018
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS THEREOF; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; 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 relates to a method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud, and belongs to the technical field of comprehensive utilization of solid waste.The method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud specifically includes the following steps that copper smelting acid mud and a nitric acid solution are mixed at a liquid-solid ratio of 5:1, the stirring rate is 500 r/min, and sodium hypochlorite is gradually added and reacted at normal temperature for 60 minutes to obtain a mixed solution containing mercury chloride and selenic acid; separated filter residues are sent to a lead smelting system for recycling, and sodium hypophosphite is added into filtrate to reduce ionized mercury in the solutionto settleable elemental mercury, after flocculation and sedimentation, the mercury-containing slag is separated by microfiltration, and refined mercury is obtained by continuous rectification and purification; and sodium sulfi