种全湿法从硫化砷废渣中提取砷的工艺

• Format: Patent
• Language: Chinese
• Published: 12.10.2018
• 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

本发明公开了种全湿法从硫化砷废渣中提取砷的工艺，该工艺是将硫化砷废渣通过氧压浸出，固液分离，得到硫渣和含五价砷和HSO的氧压浸出液；将硫化砷废渣作为还原剂还原五价砷，固液分离，得到含三价砷的溶液和渣相；含三价砷的溶液经过冷却结晶，干燥，得到砷白产品，渣相则返回氧压浸出。该工艺具有流程短、经济实用、操作环境好、溶液封闭循环等优点，且能使砷和硫分别以三氧化二砷产品和硫磺回收，解决了传统SO还原造成酸膨胀的问题，有利于工业上推广应用。 The invention discloses a process of extracting arsenic from arsenic sulfide waste residue by adopting the whole wet method. The process comprises the following steps: arsenic sulfide waste residue is subjected to oxygen pressure leaching and solid-liquid separation to obtain sulfur slag and an oxygen pressure leach solution containing pentavalent arsenic and H2SO4; arsenic sulfide waste residue is taken as a reducing agent to obtain pentavalent arsenic by reduction, and solid-liquid separation is carried out, so as to obtain a solution containing trivalent arsenic and a slag phase; the solution containing trivalent arsenic is subjected to cooling crystallization and drying to obtain a opaque glass product, and the slag phase is returned to be subjected to oxygen pressure leaching. The process ha