Santona, Laura and Castaldi, Paola and Melis, Pietro (2006) Evaluation of the interaction mechanisms between red muds and heavy metals. Journal of Hazardous Materials, Vol. 136 (2), 324 -329. ISSN 0304-3894. Article.
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This paper investigated the heavy metal adsorption of non-treated (RMnt) and acid-treated red muds (RMa), bauxite ore processing waste, in order to evaluate how efficient they are in reducing metal solubility and bioavaliability in polluted soils. Red mud samples were artificially polluted with solutions containing increasing concentrations of Pb, Cd and Zn. Cancrinite and hematite were the main phases of the red muds, and were also the components which adsorbed most heavy metals. The results showed that the RMnt adsorption capacity for the three heavy metals was Zn ≥ Pb > Cd. Acid treatment with HCl decreased the red mud's capacity to adsorb the heavy metals by 30%.
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