|About this Abstract
||Part C-1: Hydrometallurgy 2018
||M-16: The Kinetics of Atmospheric Acid Leaching of Brazilian Lateritic Nickel
||Andre Luiz Alvarenga Santos, Emily Mayer de Andrade Becheleni, Risia Magriotis Papini, Paulo Roberto de Magalhães Viana, Sonia Denise F. Rocha
|On-Site Speaker (Planned)
||Sonia Denise F. Rocha
Atmospheric processing of nickel lateritic ores with low costs has been encouraged. In this work the kinetic of atmospheric acid leaching of a northern-Brazilian ore with 1.63% Ni and large amount of fine particles (d50 ≈ 0.075 mm and 40% below 0.038 mm) is presented. Chemical analysis showed a trend of Ni and Fe concentration in finer fraction (-0.075 mm) and Si and Mg in the coarsest one (-0.500+0.150 mm) associated to distinct mineral phases. Nickel is widespread in the mineral matrix. Distinct behaviors were observed as a function of particle size associated to the distribution of silicates and iron oxides in the ore. The kinetic modeling indicated that leaching is controlled by porous layer diffusion at 65 °C, but at 95 °C exhibits a mixed control by porous layer diffusion in initial minutes (60 min) and by chemical reaction or diffusion through the pore layer in final minutes (60-240 min) depending on metal evaluated.
||Planned: At-meeting proceedings