Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Zn-Ni sulfide selective precipitation: The role of supersaturation
Sampaio, R.M.M. ; Timmers, R.A. ; Kocks, N. ; Andre, V. ; Duarte, M.T. ; Hullebusch, E.D. van; Farges, F. ; Lens, P.N.L. - \ 2010
Separation and Purification Technology 74 (2010)1. - ISSN 1383-5866 - p. 108 - 118.
acid-mine drainage - nickel sulfide - zinc-sulfide - homogeneous precipitation - metal sulfides - stirred-tank - kinetics - surface - solubility - transition
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.
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