Kinetic study of the immobilization of galvanic sludge in clay-based matrix
authors Magalhaes, JM; Silva, JE; Castro, FP; Labrincha, JA
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords galvanic sludge; ceramic matrix; inertization mechanism
keywords INERTIZATION; CERAMICS; BODIES
abstract The viability of inertization of galvanic wastes through their incorporation in clay-based materials, such as common formulations for tiles and bricks, is here studied by determining the leaching kinetics in different media. Metals immobilization is assured by firing at reasonably high temperatures, since intimately contact and/or reaction between residue and clay particles is promoted but also due to formation of insoluble metal oxides that rest unreactive towards clay grains. For most metals, leaching rate follows a zero-order kinetic law, with values between 0.001 to 0.1 mg/(g day cm(2)). Leaching velocity tends to increase with rising atomic numbers: Zn < Cu < Ni < Cr. These values depend exponentially on the relative sludge content. © 2005 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0304-3894
year published 2005
volume 121
issue 1-3
beginning page 69
ending page 78
digital object identifier (doi) 10.1016/j.jhazmat.2005.01.022
web of science category Engineering, Environmental; Engineering, Civil; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000229556500009
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journal impact factor 6.434
5 year journal impact factor 6.513
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