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