METHOD FOR PROCESSING REFUSE OF FLOTATION PROCESSING OF ORE CONCENTRATES CONTAINING IRON

摘要

The method comprises the following steps:
(a) Preliminary wet magnetic separation to separate the iron containing phase from the silicate non-magnetic phase;
(b) Mixing the iron containing phase with 5-10% of aqueous alkali hydroxide at 45-100°C for 1-3 hours and separation of the iron containing phase as a pulp;
(c) Leaching by treatment of the iron containing pulp of step (b) with hot 12-15% aqueous oxalic acid at continuous stirring and heating to 95°C for 1-3 hours adding continuously 3-5% of hydrogen peroxide solution;
(d) Mixing of the oxalate solution of step (c) with an aqueous alkali metal hydroxide at 20-25° and pH 7-12, allowing it to stay for 1-2 hours;
(e) Mixing the filtrate of step (d) with an aqueous alkali hydroxide at pH at least 12 and heating to 55-60°C for 1 hour.