Zn-Ni sulfide selective precipitation: The role of supersaturation

R.M.M. Sampaio, R.A. Timmers, N. Kocks, V. Andre, M.T. Duarte, E.D. van Hullebusch, F. Farges, P.N.L. Lens

Research output: Contribution to journalArticleAcademicpeer-review

33 Citations (Scopus)

Abstract

The selective removal of Zn with Na2S from a mixture of Zn and Ni was studied in a continuously stirred tank reactor. At pH 5 and pS 18 the selectivity was improved from 61% to 99% by reducing the supersaturation at the dosing points by means of the reduction of the influent concentrations. The particle size distribution (PSD) of the precipitates increased as the supersaturation decreased up to a mode of about 22 mu m at pH 5. PSD values on the 100-200 mu m range were obtained when the sulfide was dosed through a polytetrafluoroethylene (Teflon) membrane at low supersaturation. Zn precipitated as sphalerite, whereas Ni mainly formed amorphous particles with a pH dependent stoichiometry.
Original languageEnglish
Pages (from-to)108-118
JournalSeparation and Purification Technology
Volume74
Issue number1
DOIs
Publication statusPublished - 2010

Keywords

  • acid-mine drainage
  • nickel sulfide
  • zinc-sulfide
  • homogeneous precipitation
  • metal sulfides
  • stirred-tank
  • kinetics
  • surface
  • solubility
  • transition

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