SEPARATION OF ARSENIC FROM AQUEOUS ACIDIC SOLUTION

• Main Author: ICHIJIYOU MICHIO
• Format: Patent
• Language: English
• Published: 03.06.1982
• 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

PURPOSE:To separate metallic As economically by a method wherein As ions are reduced to metallic As by stirring with Cu amalgam, Pb amalgam or the like in the presence of Cl ions in a specified temperature renge within a tank which is sealed off against entrance of air, and then solid-liquid separation is carried out. CONSTITUTION:The aqueous acidic solution containing As ions is contained in a tank, the concentration of Cl ions in the solution is increased by adding NaCl or the like, the liquid temperature is set to be 50-100 deg.C (particularly, 85-95 deg.C) and the tank is sealed against the entrance of air. Then, while constantly stirring the content of the tank, an amalgam of Cu, Pb or Cd or metallic Cu or metallic Cd is added to the solution, thereby reducing the As ions into the form of precipitating metallic As or As amalgam. The metallic As or the As amalgam thus formed is separated by a solid-liquid separation process.