Leaching behaviour of a galvanic sludge in sulphuric acid and ammoniacal media
authors Silva, JE; Soares, D; Paiva, AP; Labrincha, JA; Castro, F
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords galvanic sludge; sulphuric acid leaching; ammoniacal leaching; metals
keywords NICKEL-OXIDE; CHALCOPYRITE; EXTRACTION; RECOVERY; PRESSURE; KINETICS; CATALYST; WASTES
abstract Leaching studies of a sludge produced by the physico-chemical treatment of wastewaters generated by a Ni/Cr plating plant were carried out in both sulphuric acid and ammoniacal media aiming to decide which of them would be the best treatment for this kind of waste material. The dissolution behaviour of some metals (Cu, Ni, Cr and Zn) was studied in order to assure the best metal recovery conditions in subsequent processes by the use of some separation methods such as solvent extraction and precipitation techniques. Therefore, the study here presented deals with the first chemical stage of an integrated treatment process. For the sulphuric acid leaching, maximal conversions obtained were 88.6% Cu, 98.0% Ni and 99.2% Zn for the following experimental conditions: a 100 g L-1 acid concentration, a 5:1 liquid-to-solid ratio (US), a particle size less than I nun, a digestion time of I h, a stirring speed of 700 rpm (all at room temperature and under atmospheric pressure). As expected, no selectivity was achieved for the sulphuric acid leaching, despite this option yielding much higher metal ion dissolution when compared with that reached by ammoniacal leaching. The use of this latter medium allowed the extraction of Cu and Ni without Cr species, but rates of conversion were only about 70% for Cu and 50% for Ni, much lower than those obtained for sulphuric acid leaching. © 2004 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-3894
year published 2005
volume 121
issue 1-3
beginning page 195
ending page 202
digital object identifier (doi) 10.1016/j.jhazmat.2005.02.008
web of science category Engineering, Environmental; Engineering, Civil; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000229556500023
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