Siberian Federal University (Krasnoyarsk, Russia):

Vasyunina N. V., Associate Professor, Candidate of Engineering Sciences, NVVasyuni-na@gmail.com
Dubova I. V., Associate Professor, Candidate of Engineering Sciences, idubova@mail.ru
Sharypov N. A., Senior Lecturer, Nikita.Sharypov@gmx.com

LLC «RUSAL ITC» (Krasnoyarsk, Russia):
Belousov S. V., Head of Department, Stanislav.Belousov@rusal.com

A method is proposed for extracting contaminating components from aluminum production sweepings for their subsequent recovery to the electrolyzer. The following processing system is proposed for the material: grinding – classification – reverse flotation – thickening. In order to ensure complete removal of silicon and iron oxides in the flotation of sweepings, Flotigam 7266 flotation agent by Clariant (Germany) is used, representing a mixture of primary fatty alkylamines. The removal of carbon particles is ensured through the use of pine oil mixed with kerosene. Flotation is carried out in a FML 0.3 flotation machine. The feed, flotation product and tails are analyzed to determine the content of carbon, aluminum, iron and silicon oxides using X-ray spectrometry, X-ray phase analysis and chemical assays. It is established that pro-cessing of the total mass of the material does not render a product with any acceptable contents of silicon and iron oxides. A phase analysis of various fractions of the feed material is carried out. It is proposed to process the material fractions containing the minimum amount of contaminants (such as carbon and silicon and iron oxides). Based on the X-ray spectrometry results for various material fractions, two fractions of +5 mm and –0.071 mm are selected for flotation. Processing of the –0.071 mm material renders a flotation product of the required grade and flotation alumina based on this product. In the processing of the coarse electrolyte-containing fraction (+5.0 mm), a product with a high fluorine content is obtained, indicating its high application prospects.

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