Siberian Federal University

The implementation of the closed-loop ecology concept highlights the need to develop new, highly efficient technologies for processing large- scale inorganic waste. The search for new highly efficient leaching agents is a separate but highly promising area of inorganic synthesis technology, particularly in the organization of valuable component extraction processes. Quartz-leucoxene concentrate is a relatively unclaimed, large-scale product of shale oil production at the Yarega oil and titanium field, yet an economically feasible technology for its comprehensive processing still lacks. As part of this study, the potential use of substandard aqueous TiCl4 solutions obtained during the selective chlorination of quartz-leucoxene concentrate or its byproducts was assessed as a leaching agent in the processing of large-scale mineral waste (raw materials) such as metallurgical scale, brucite- containing refractory waste, and nepheline concentrate to produce innovative complex titanium- containing coagulants was assessed. It was demonstrated that aqueous TiCl4 solutions are superior to aqueous HCl solutions of equivalent concentration in their reactivity with these samples. The extraction rate of iron, magnesium, and aluminum compounds from the corresponding wastes was, on average, 7–12 % higher than with aqueous HCl solutions. Reaction mixtures based on TiCl4 heated up more intensely, and the leaching reaction proceeded, on average, 25 % faster. It has been hypothesized that the increased reactivity of TiCl4 aqueous solutions is due to the wide range of intermediate products of titanium tetrachloride hydrolysis. The data obtained in these experiments will significantly expand the scope of inorganic synthesis, producing a wide range of titanium- containing products (catalysts, sorbents, coagulants, etc.)