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6951773 
Journal Article 
Leaching and geochemical behavior of fired bricks containing coal wastes 
Taha, Y; Benzaazoua, M; Edahbi, M; Mansori, M; Hakkou, R; , 
2018 
Yes 
Journal of Environmental Management
ISSN: 0301-4797
EISSN: 1095-8630 
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD 
LONDON 
209 
227-235 
English 
29304505 
WOS:000425074400023 
High amounts of mine wastes are continuously produced by the mining industry all over the world. Recycling possibility of some wastes in fired brick making has been investigated and showed promising results. However, little attention is given to the leaching behavior of mine wastes based fired bricks. The objective of this paper is to evaluate the geochemical behavior of fired bricks containing different types of coal wastes. The leachates were analyzed for their concentration of As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Zn and sulfates using different leaching tests; namely Tank Leaching tests (NEN 7375), Toxicity Characteristic Leaching Procedure (TCLP) and pH dependence test (EPA, 1313). The results showed that the release of constituents of potential interest was highly reduced after thermal treatment and were immobilized within the glassy matrix of the fired bricks. Moreover, it was also highlighted that the final pH of all fired samples changed and stabilized around 8-8.5 when the initial pH of leaching solution was in the range 2.5-11.5. The release of heavy metals and metalloids (As) tended to decrease with the increase of pH from acidic to alkaline solutions while Mo displayed a different trend. (C) 2017 Elsevier Ltd. All rights reserved.