TREATMENT OF MAGNESIA NICKEL SILICATE ORE

摘要

PURPOSE:To form a highly filterable precipitate and to efficiently use an inexpensive iron material by adding a neutralizer under specified conditions in the method wherein an Ni ore is leached with hydrochloric acid and the leachate is neutralized with MgO, etc. CONSTITUTION:A magnesia nickel silicate ore is leached with hydrochloric acid, the leaching residue consisting essentially of SiO2 is separated, and MgO, etc., as the neutralizer is added to the leachate at the ratio of 0.37-1.88g/min.l expressed in terms of pure Mg. The hydrochloric acid is neutralized to pH0.1-2.5 to form a highly filterable iron precipitate, and the precipitate is filtered off. The remaining leachate and an iron material are placed in a wet crushing vessel, vibrated and agitated to substitution-deposit metallic Ni, the Ni is separated from the soln. to obtain an iron-Ni mixture (steelmaking material). The soln. from which Ni has been separated is controlled to pH3.5-7.5 by air oxidation or neutralization to precipitate iron, the iron is filtered off from the aq. magnesium chloride soln., and the soln. is dried and roasted to recover hydrochloric acid and MgO.