The kinetics of zinc silicate leaching in sodium hydroxide.
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2010
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Resumo
The alkaline leaching kinetics of a zinc silicate ore assaying 34.1% Zn, 11.1% Fe and 22.9% SiO2 is studied in sodium hydroxide solutions. Speciation diagrams indicate zinc dissolution as [Zn(OH)4]2− and SEM analysis showed a progressive reduction in particle size during leaching which supports the shrinking particle model. The process is chemically controlled with an activation energy of 67.8±9.0 kJ/mol and reaction order with respect to NaOH determined as 1.44±0.46.
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Zinc silicate, Sodium hydroxide, Leaching kinetics, Shrinking particle model, Chemical control
Citação
SANTOS, F. M. F. et al. The kinetics of zinc silicate leaching in sodium hydroxide. Hydrometallurgy, v. 102, n. 1-4, p. 43-49, abr. 2010. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0304386X10000241>. Acesso em: 02 ago. 2012.