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COMPLEX RAW MATERIAL UTILIZATION
ArticleName Principles of pyrometallurgical processing of quartz-leucoxene concentrates with the formation of a pseudobrookite phase. Part 2. Phase transformations
DOI 10.17580/or.2022.05.04
ArticleAuthor Kuzin E. N., Mokrushin I. G., Kruchinina N. E.
ArticleAuthorData

Mendeleev University of Chemical Technology (Moscow, Russia):

Kuzin E. N., Associate Professor, Candidate of Engineering Sciences, e.n.kuzin@muctr.ru
Kruchinina N. E., Dean, Doctor of Engineering Sciences, Professor, krutch@muctr.ru

Perm State National Research University (Perm, Russia):

Mokrushin I. G., Associate Professor, Candidate of Сhemical Sciences

Abstract

Quartz-leucoxene ore and its processing concentrates are valuable titanium-containing raw materials, however a comprehensive processing technology for the ore is yet to be developed. This paper studies the high-temperature processes occurring in a system containing quartz-leucoxene concentrate with an iron-containing additive. It has been established that, depending on the atmosphere of the pyrometallurgical processing and the type of the iron-containing additive, phases of ilmenite (in an inert atmosphere) or pseudobrookite (in an oxidizing atmosphere) may be obtained. The possibility of using heat treatment and forging scale (a common large-tonnage metallurgical production waste) as an iron-containing additive has been studied. It has been established that pseudobrookite will be the final product. For all concentrate/iron-containing additive systems studied, depending on the thermal effects, the possibility of intermediate reduction/oxidation reactions for iron oxides and of the formation of Fe2TiO4 intermediate phases (followed by their transition to the pseudobrookite phase) was identified. The minimum triggering temperatures for the conversion process of quartz-leucoxene concentrate Fe2TiO5 and FeTiO3 have been established, as well as the main thermal effects, mass losses, and melt crystallization parameters, which allows optimizing the conditions for pyrometallurgical conversion. The data obtained enables effective process scaling. It has been established that impurity components in the concentrate (up to 7–9 wt% on average) enter into intrasystem reactions with the formation of calcium titanates (sphene CaSiTiO5) and magnesium (MgTiO3, MgTi2O5, Mg2TiO2).
This is a continuation of the article titled «Principles of pyro-hydrometallurgical processing of quartz-leucoxene concentrates with the formation of a pseudobrookite phase» («Obogashchenie Rud», 2021, No. 3).

keywords Thermogravimetric analysis, differential scanning calorimetry, quartz-leucoxene concentrate, pseudobrookite, impurity components
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