Sands of a number of titanium deposits contain, in addition to ilmenite -FeO-TiO2, significant amounts of siderite FeCO3. During enrichment, ilmenite and siderite are separated, sending the siderite concentrate (SC), containing part of TiO2 and impurities, to the dump, and the iron-titanium concentrate (ITC) to the electric smelter for titanium slag ...