Zn-Ni sulfide selective precipitation: The role of supersaturation

被引：35

作者：

Sampaio, R. M. M. ^{[1
]}

Timmers, R. A. ^{[1
]}

Kocks, N. ^{[1
]}

Andre, V. ^{[2
]}

Duarte, M. T. ^{[2
]}

van Hullebusch, E. D. ^{[3
]}

Farges, F. ^{[4
,5
]}

Lens, P. N. L. ^{[1
]}

机构：

[1] Wageningen Univ, Sub Dept Environm Technol, NL-6700 EV Wageningen, Netherlands

[2] Inst Super Tecn, Ctr Quim Estrutural, DEQB, P-1049001 Lisbon, Portugal

[3] Univ Paris Est, Lab Geomat & Environm G21, EA 4119, F-77454 Marne La Vallee 2, France

[4] Museum Natl Hist Nat, CNRS, UMR 7202, Lab Mineral, Paris, France

[5] Museum Natl Hist Nat, CNRS, UMR 7202, Cosmochim Museum, Paris, France

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2010年 / 74卷 / 01期

关键词：

Sulfide precipitation; Zinc sulfide; Nickel sulfide; Metal selective precipitation; Supersaturation; pS; NICKEL SULFIDE; KINETICS; SURFACE; SOLUBILITY; TRANSITION; ACID; AGGREGATION; MORPHOLOGY; STABILITY; OXIDATION;

D O I：

10.1016/j.seppur.2010.05.013

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：108 / 118

页数：11

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