Leaching Kinetics of Valuable Metals

Investigation of Leaching Kinetics of Smithsonite Ore

The leaching kinetics of smithsonite ore in acetic acid solutions, an environmental friend, and natural reagent was investigated. The influence of parameters such as reaction temperature, particle size, solid-liquid ratio and acid concentration was studied in order to reveal the leaching kinetics of smithsonite ore. In this study, experimental and statistical methods were carried out in order t...

Microbial Leaching Process to Recover Valuable Metals from Spent Petroleum Catalyst Using Iron Oxidizing Bacteria

Spent petroleum catalyst from Korean petrochemical industry contains trace amount of metals such as Ni, V and Mo. Therefore an attempt was made to recover those trace metal using bioleaching process. Different leaching parameters such as Fe(II) concentration, pulp density, pH, temperature and particle size of spent catalyst particle were studied to evaluate their effects on the leaching efficie...

8 Microbial Leaching of Metals

Leaching Kinetics of Stibnite in Sodium Hydroxide

Spherical pellets of antimony sulphide were dissolved in 1 molar sodium hydroxide solutions at different temperatures. It was found that the shrinking core with ash layer model could satisfactorily explain the dissolution process. Using this model it was found that initially the rate controlling step is a chemical reaction with activation energy of 10.2 kJ/mol. As the ash layer builds up, diffu...

Leaching Process for the Recovery of Valuable Metals from Spent Lithium- Nickel-cobalt-manganese-oxide-based Lithium-ion Batteries

This study focused on the leaching process for the recycling of Li, Ni, Co, and Mn from the LiNixCoyMnzO2 (NCM) cathodes of spent lithium-ion batteries (LIBs). Eh–pH diagrams were used to analyze suitable leaching conditions. Operating variables, such as the concentration of H2SO4 (0.5–2.5 M), concentration of H2O2 (0–1 vol%), temperature (10–50 °C), stirring speed (400–800 rpm), and solid/liqu...