Hydrometallurgical treatment of tailings with high zinc content
2006; Elsevier BV; Volume: 82; Issue: 1-2 Linguagem: Inglês
10.1016/j.hydromet.2006.01.005
ISSN1879-1158
AutoresShirin Espiari, Fereshteh Rashchi, S.K. Sadrnezhaad,
Tópico(s)Mine drainage and remediation techniques
ResumoZinc exists as smithsonite and hemimorphite in the lead flotation tailings from the Dandi mineral processing plant in north western Iran. In this research, zinc-rich tailings produced in the Dandi plant were characterized mineralogically and a leaching study was carried out to assess the effect of several parameters on the kinetics of zinc dissolution. Parameters studied included: sulfuric acid concentration, reaction time, temperature and slurry density. It was found that leaching is controlled by a single rate-controlling step with an activation energy of 23.5 kJ/mol. To overcome some of the filtration problems associated with polymerization of silicic acid, lime was added as a coagulant. The optimum pH, holding time and temperature required to maximize the filtration rate were determined.
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