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Название Carbonization processing of bauxite residue as an alternative rare metal recovery process
DOI 10.17580/tsm.2020.10.08
Автор Pyagay I. N., Kremcheev E. A., Pasechnik L. A., Yatsenko S. P.
Информация об авторе

Saint Petersburg Mining University, Saint Petersburg, Russia:

I. N. Pyagay, Professor, Doctor of Technical Sciences, e-mail: igor-pya@yandex.ru
E. A. Kremcheev, Head of Department, Doctor of Technical Sciences, e-mail: kremcheev@spmi.ru


Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russia:

L. A. Pasechnik, Lead Researcher, Candidate of Chemical Sciences, e-mail: pasechnik@ihim.uran.ru
S. P. Yatsenko, Principal Researcher, Professor, Doctor of Chemical Sciences, e-mail: yatsenko@ihim.uran.ru


A prerequisite for commercial production of rare metals is a continuous effort given to developing knowledge-intensive recovery and refining techniques. Commonly known natural raw materials and conventional processing techniques, which are based on initial acid activation and recovery of minerals, as well as selective recovery of the target component (i.e. by sorption and extraction) cannot always ensure sufficient productivity or cost-effectiveness. This paper considers certain aspects of continued research in this area, which would require novel techniques. Such techniques should be based on new approaches allowing for the use of alternative raw materials to produce valuable rare metals on a cost-effective basis. It is demonstrated that red mud, i.e. waste material generated by bauxite industry and rich in scandium and other rare metals, can serve as such alternative source material. The paper describes the results of a study that looked at finding an optimum carbonization process for red mud that would ensure a consistent and predictable complexing process with regard to certain components. The paper also examines the environment in which soluble carbonate complexes can be stabilized and concentrated in the pregnant solution before the primary scandium-bearing concentrate can be recovered. The authors identified target parameters that determine enhanced filtration properties of carbonized slurry to ensure complete separation of the pregnant solution from the dehydrated (to the residual moisture content of 18%) carbonized residue. The paper highlights some positive factors of the carbonization process which enable a comprehensive utilization of alumina production waste. They include a long-term sequestration of carbon dioxide in the air and modified physical and chemical properties of red muds. This makes carbonized muds more compactable and thus more suitable for transportation and minimizes waste disposal hazards.
The experimental research was carried out in conformance with the governmental assignments of the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences and Saint-Petersburg Mining University.

Ключевые слова Red mud, carbonization, rare metals, scandium, zirconium
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