To the Problem of the Hydrometallurgical Desiliconization of Quartz–Titanium Concentrates from the Pizhem Deposit with Different Iron Contents

A new hydrothermal lime–alkaline method for the desiliconization of quartz–titanium concentrates has been developed at the Baikov Institute of Metallurgy and Materials Science of the Russian Academy of Sciences (IMET RAS). Specific features of the conditions for the selective removal of finely dispersed SiO2 depending on the initial mineral composition and iron content are shown for quartz–leucoxene and quartz–ilmenite concentrates from the Pizhem deposit. The pressure leaching of the concentrates is shown to proceed via the two-stage mechanism to form diverse calcium silicate hydrates nCaO⋅mSiO2⋅xH2O, which will govern the physical properties of the autoclave pulp.