UN PROCEDIMIENTO PARA RETIRAR HIERRO DESDE SOLUCIONES.

摘要

1,242,147. Separating iron from solution. UNION CARBIDE CANADA Ltd. 28 Feb., 1969 [3 April, 1968], No. 10696/69. Heading C1A. Iron is removed from an aqueous solution containing both Fe2+ and particles of MnO 2 by adjusting the pH to between 2 and the pH at which Fe2+, Zn2+ and Cd2+ ions form hydroxides, the Fe2+ being adsorbed by the MnO 2 and oxidized by the MnO 2 to Fe 2 O 3 which is then separated from solution as Fe 2 O 3 .MnO 2 . Preferably the MnO 2 in added after the adjustment of pH. Any iron in solution which is not as Fe2+ may first be reduced to Fe2+ by, for example, ZnS. The MnO 2 has a mesh size (Tyler) preferably between 50 and 300 and the temperature is preferably between 20‹ C. and the boiling point of the solution. The solution may be that derived from leaching ores also containing zinc, and/or cadmium. The Fe 2 O 3 .- MnO 2 may be subsequently treated with mineral acid (e.g. H 2 SO 4 ) to dissolve the iron, as Fe3+, the MnO 2 being recovered and re-used or the Fe 2 O 3 .MnO 2 may be treated with further Fe2+ solution until all the manganese is in solution at Mn2+.