D. Mendeleev University of Chemical Technology of Russia (Moscow, Russia):

A. V. Kolesnikov, Associate Prof., Dept. “Innovative materials and corrosion protection”, E-mail: artkoles@list.ru
Than So Htay, Post-graduate Student, Dept. “Technology of inorganic substances and electrochemical processes”
V. A. Kolesnikov, Dr. Eng., Prof., Head of Dept. “Innovative materials and corrosion protection”

National University of Science and Technology MISiS (Moscow, Russia):
V. S. Kovalenko, Dr. Eng., Prof., Head of Dept. “Open cast mining”

This paper examines an electroflotation process in which iron hydroxides are recovered from chloride-sulphate solutions in the presence of surfactants of different types, as well as calcium and magnesium cations used as reagents. It was found that calcium and magnesium cations lower the recovery of iron hydroxides by 30 to 40%. Introduction of surfactants intensifies the recovery of iron (III) hydroxides making it reach 89 to 98%. It was found that the anionic surfactant NaDDS produces a positive effect on the recovery of chromium (III) hydroxides by electroflotation by raising the recovery rate by 30 to 40% and expanding the effective pH range to 9. NaDDS improves the recovery of the mixture of iron, chromium and aluminium hydroxides in electrolytic solutions (10 g/l). Water treatment procedures are described aimed at removing iron (II, III) ions and the iron/chromium mixture.

This research study was funded by D. Mendeleev University of Chemical Technology of Russia, Project no. З-2020-004.

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