METHOD OF TREATING COPPER-ARSENIC COMPOUND

• Main Authors: ABUMIYA MITSUO, SATO YUSUKE, MATSUMOTO MASAYOSHI, MIKAMI HIRONOBU, OOUCHI MASAMI, FUJITA TETSUO
• Format: Patent
• Language: English; Korean
• Published: 06.05.2010
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; FERROUS OR NON-FERROUS ALLOYS; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; SEPARATION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

A method that in the treatment of arsenic contained in a nonferrous smelting intermediary product, especially treatment of copper-arsenic compounds in the form of an intermetallic compound, would produce stable scorodite excelling in filterability easily without cumbersome operation with high reproducibility. Scorodite is produced through the leaching step of leaching out arsenic in the presence of a sulfurizing agent and an oxidizing agent from a nonferrous smelting intermediary product containing copper-arsenic compounds in the form of an intermetallic compound; the liquid adjusting step of adding an oxidizing agent to the leachate to thereby carry out an oxidation from trivalent arsenic to pentavalent arsenic; and the crystallization step of converting the arsenic contained in the adjusted liquid to scorodite crystals.