Studi Kinetika Pelindian Bijih Nikel Limonit Dari Pulau Halmahera Dalam Larutan Asam Nitrat [Kinetics Study of Nickel Limonite Ore Leaching from Halmahera Island in Nitric Acid Solution]
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Abstract
One of the recent developments in the extraction of nickel from laterite ore by hydrometallurgical route is to use leaching reagent which can be regenerated, such as hydrochloric and nitric acids. Although the success of leaching of laterite ore has been reported, leaching kinetics study of laterite ore in nitric acid is still poorly published. In this paper, the results of leaching kinetics analysis of nickel laterite ore of limonite type from Halmahera Island in nitric acid solution at atmospheric pressure is discussed. The purposes of the kinetics study are to determine ratedetermining step, kinetic parameters (i.e. reaction rate constant or diffusion coefficient), activation energy and the kinetics model. Leaching kinetics was studied by adopting shrinking core models (SCM). The analysis results reveal that the leaching rate of Halmahera limonite ore from Halmahera Island in nitric acid is controlled by diffusion through solid layer product with effective diffusion coefficient (De) of 2.1- 8.55 x 10-10 m 2 /s at the temperature range of 65-95 °C and activation energy of 46.78kJ/mol.
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