Mechanism, kinetics and thermodynamics of nickel, iron, and magnesium hydrochloric acid leaching from laterite ore.

ABSTRACT: The kinetics of hydrochloric acid leaching of oxidized magnesite-iron nickel ores from the Gornostaevskoye deposit (Eastern Kazakhstan) were investigated. The ore has high contents of Mg (14.25 wt.%), Fe (10.8 wt.%) and Si (24.32 wt.%), with a Ni content of 0.87 wt.%. The optimal process parameters were determined as follows: S:L = 1:4, temperature = 85-90 °C, leaching duration = 120 min, HCl concentration = 18%, and stirring rate = 400 rpm. The extraction rates of Ni, Mg and Fe were 91.03%, 97.88% and 93.04%, respectively. The pregnant leach solution contained 1.98 g L^-1 Ni, 35.31 g L^-1 Mg and 25.12 g L^-1 Fe. Kinetic modeling indicated that the leaching of Ni, Fe, and Mg followed a mixed-control mechanism, with activation energies of 76.07 kJ mol^-1

SUBMITTER: Shayakhmetova R 

PROVIDER: S-EPMC12638750 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature