| 摘要 |
<p>1515596 Removal of arsenic and antimony from ores METALLURGIEHOBOKEN-OVERPELT 1 April 1976 [1 April 1975 14 May 1975] 13244/76 Heading C1A Ores or metallurgical by-products containing As and Sb are leached in acid solution at 20-200‹C under pressure with oxygen, or gas containing free oxygen, and arsenic and/or phosphorus are added to give the molar ratio of (As + 4P): Sb of at least 8 in the leach mixture. The arsenic and antimony dissolved in the leach solution may be simultaneously or separately extracted in liquid-liquid extraction processes by varying the quantity of phosphoric acid ester, phosphorous, phosphoric or phosphinous acid esters and organophosphoric compounds which are used as extractants combined with 2-30% by volume of an alkylated 8- hydroxyquinoline and inert organic diluents. After extraction, the organic liquor may be regenerated by treatment with a base or reducing agent. Co, Ni and Cu are dissolved as sulphates when speiss is leached with H 2 SO 4 + (H 3 AsO 4 or H 3 PO 4 ).</p> |
