Author/Authors :
Santos، نويسنده , , Fabiano M.F. and Pina، نويسنده , , Pablo S. and Porcaro، نويسنده , , Rodrigo and Oliveira، نويسنده , , Victor A. and Silva، نويسنده , , Carlos A. and Leمo، نويسنده , , Versiane A.، نويسنده ,
Abstract :
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.
Keywords :
Chemical control , Shrinking particle model , Leaching kinetics , Zinc silicate , Sodium hydroxide
