KINETIC MODELS OF NICKEL LATERITE ORE LEACHING PROCESS
The subject of this study is leaching process of nickel-bearing laterite ore from Ržanovo, R. Macedonia. The influence of sulfuric acid concentration (0.5, 1 and 3 M H2SO4) on the extracted Ni (%, wt.) was studied. The leaching process intensified by magnetic stirring at different temperatures (298, 323, 348 and 363 K) in the time interval of 120 min. was performed. The results were used for kinetic analysis of the leaching process. It was found that for 3 M H2SO4, the best fitting has shown the Jander and Ginstling-Braunshtein models, which point out that limiting step of the process is diffusion. Activation energy was calculated to be 42,67 kJ·mol–1 (Jander model) 40,28 kJ·mol–1 (Ginstling – Brousthein model), which confirm the diffusion controlled process.