I. V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials of Russian Academy of Sciences Kola Scientific Center (ICTREMRM KSC RAS)

E. K. Kopkova, Senior Researcher, e-mail: kopkova@chemy.kolasc.net.ru

E. A. Shchelokova, Junior Researcher

P. B. Gromov, Deputy Director on Scientific Work

G. I. Kadyrova, Senior Researcher

There is researched the process of low-temperature decomposition of vanadium-containing titanomagnetite in a non-aqueous solvent environment in the following system: monoatomic aliphatic alcohol ROH (R = C₇–C₈) — mineral acid (HCl). The process of titanomagnetite decomposition by a non-aqueous solvent is found to be affected by the aliphatic alcohol structure, acid concentration in the extract, and the non-aqueous phase and solid phase ratio. According to the influence efficiency on titanomagnetite, the researched alcohols are different in the following range: n-heptanol > n-octanol > iso-octanol. This correlates with the alcohols’ dielectric constant. During the titanomagnetite decomposition process in a non-aqueous environment, it is found that ferrous iron chloride and vanadium are concentrated in the one phase, ferric iron chloride — in the extract, and titanium — in the hardly decomposable mineral part. The stability of non-aqueous solvent in time has been studied at different temperatures and by the influence of the concentrated mineral acids in multiple “leaching – extraction – re-extraction” cycles. No visible changes are observed in the structure or its basic physical, chemical and extractional characteristics. Changing of the reaction environment on a non-aqueous solvent allows to intensificate the titanomagnetite decomposition. This happens as the result of the higher selectivity of the dividing processes, decreasing the number of operations and reducing of the power consumption.

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