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

doi:10.1016/j.seppur.2010.05.013

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 journal › Article › Academic › peer-review

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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 language	English
Pages (from-to)	108-118
Journal	Separation and Purification Technology
Volume	74
Issue number	1
DOIs	https://doi.org/10.1016/j.seppur.2010.05.013
Publication status	Published - 2010

Keywords

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

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10.1016/j.seppur.2010.05.013

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title = "Zn-Ni sulfide selective precipitation: The role of supersaturation",

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.",

keywords = "acid-mine drainage, nickel sulfide, zinc-sulfide, homogeneous precipitation, metal sulfides, stirred-tank, kinetics, surface, solubility, transition",

author = "R.M.M. Sampaio and R.A. Timmers and N. Kocks and V. Andre and M.T. Duarte and {van Hullebusch}, E.D. and F. Farges and P.N.L. Lens",

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T1 - Zn-Ni sulfide selective precipitation: The role of supersaturation

AU - Sampaio, R.M.M.

AU - Timmers, R.A.

AU - Kocks, N.

AU - Andre, V.

AU - Duarte, M.T.

AU - van Hullebusch, E.D.

AU - Farges, F.

AU - Lens, P.N.L.

N1 - ISI:000280542000014

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

KW - acid-mine drainage

KW - nickel sulfide

KW - zinc-sulfide

KW - homogeneous precipitation

KW - metal sulfides

KW - stirred-tank

KW - kinetics

KW - surface

KW - solubility

KW - transition

U2 - 10.1016/j.seppur.2010.05.013

DO - 10.1016/j.seppur.2010.05.013

M3 - Article

SN - 1383-5866

VL - 74

SP - 108

EP - 118

JO - Separation and Purification Technology

JF - Separation and Purification Technology

IS - 1

ER -

Zn-Ni sulfide selective precipitation: The role of supersaturation

Abstract

Keywords

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