<Original Papers>Desulphurization by Magnetic Separation of Iron Ore

The possibility of beneficiation by means of magnetic separation of a low-grade iron ore containing pyrite, pyrrhotite and chalcopyrite for blast furnace has been investigated. The results obtained are as follows : - (1) The contents of sulphide minerals and their sulphur grades in the products of magnetic separation of the sample of ore from Santa Ines, the Phillipines, were measured under the microscope and determined by means of chemical analysis. (2) The degrees of liberation of sulphide minerals in the products of magnetic separation were measured. The measured values were corrected for the locking factors of the constituents and their correlation with the results of magnetic separation was discussed. (3) It has been shown that the concentrate containing 1% or less S may be obtained when pyrite predominates over pyrrhotite in the feed crushed under the liberation size of these minerals