ION FLOTATION OF YTTRIUM GROUP CATIONS OF THE NITRATE-CHLORIDE SOLUTIONS BY SODIUM DODECYL SULFATE

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-56-8 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 2, 1113-1120 pp

ABSTRACT
To extract the ore leaching solutions of the rare earth elements (REE)
concentrates using technology based on physical-chemical methods: extraction of
organic reagents, Ion Exchange and others. The work explores the use of ion flotation
with surface-active substances (NaDS) – sodium dodecyl sulfate. Distribution and
separation coefficients in aqueous solutions at different pH have been estimated.
Hydroxo complexes of the REE in solutions have been analyzed. Furthermore, in the
experiment the effect of adding chloride ions to the system is established. Comparing
the pH values of complex formation, the pH at which begins the formation of
complexes or hydrates and pH to removal the maximum value of the pH. In solutions
which contain yttrium or ytterbium and erbium exist two-stage complex formation of
the hydroxo complexes - МеOH(2+) and Ме(ОН)2+
2 Ме(OH) , respectively. Therefore, the ion
flotation of cations of these metals are removal to the foam in the form of hydroxo
complexes the following composition: МеOH(DS)2 , Ме(ОH)2DS, Mе(OH)3. The exception is yttrium, whose pH above pHhydr, maximum recovery and therefore there is no extraction of hydroxides.

Keywords: Rare earth elements (yttrium group cations), sodium dodecyl sulfate, ion
flotation