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Comparative study of dewatering characteristics of metal precipitates generated during treatment synthetic polymetallic and AMD solutions.

Djedidi, Zied; Médard, Bouda; Cheikh, Ridha Ben; Mercier, Guy; Tyagi, Rajeshwar Dayal; Blais, Jean-François (2009). Comparative study of dewatering characteristics of metal precipitates generated during treatment synthetic polymetallic and AMD solutions. Hydrometallurgy , vol. 98 , nº 3-4. p. 247-256. DOI: 10.1016/j.hydromet.2009.05.010.

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Résumé

The sludge dewatering characteristics expressed in terms of settling, filtration and centrifugation of metal precipitates generated during treatment of polymetallic solutions and synthetic acid mine drainage have been evaluated in this research. Results show that dewatering properties of metallic sludge vary depending on the type of matrix (Cl; SO42−), precipitating agent, and metals present in effluent. Metal hydroxides (at pH 10.0) and metal phosphates precipitates (at pH 7.0) are amorphous in nature, thus difficult to dewater. In these treatment methods, the substitution of chloride matrix by sulphate one improves considerably dewatering properties (specific resistance to filtration = 6.60 × 1013 and 2.35 × 1013 m/kg for the chloride and sulphate matrix, respectively). In the case of sulphide and carbonate treatments (pH 8.0), precipitates obtained are semi crystalline, and crystalline form, respectively, and no influence of the matrix was detected on dewatering characteristics.

Type de document: Article
Mots-clés libres: metal; precipitation; sludge; dewatering; hydroxide; sulphide; phosphate; carbonate
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 janv. 2021 15:46
Dernière modification: 11 janv. 2021 15:46
URI: http://espace.inrs.ca/id/eprint/10799

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