PROCEDIMENTO PER DEPURARE SOLUZIONI DI SOLFATO DI ZINCO PROVENIENTI DA LISCIVIAZIONE

摘要

1393606 Zinc sulphate purification SOC DES MINES ET FONDERIES DE ZINC DE LA VIEILLE MONTAGNE SA 27 July 1972 [16 May 1972] 35144/72 Heading C1A [Also in Division C7] Zinc sulphate solution is purified by: (1) coprecipitating hydrolysable impurities with Fe(OH) 3 ; (2) adding zinc to remove Cu and Cd by cementation; (3) heating to between 80‹ C. and the boiling point; and (4) adding antimony or an antimony compound and zinc powder to cement Co. The preferred antimony compound is Sb 2 O 3 and the zinc powder may contain 0À5-2% by weight of lead. A lead salt (preferably lead sulphate) may be added with the antimony compound or before the zinc powder. Zinc may be produced from the purified solution by electrolysis.