Abstract
The leaching of calcined magnesite using ammonium chloride has been tested in a pH-stat to ascertain the effect of process parameters viz. temperature, concentration of NH 4Cl, pH, and particle size and reactivity of the solid. The main purpose of the approach adopted was to keep the lixiviant composition constant during individual measurements. A simple mathematical model has been used to describe the dissolution of magnesium during leaching and to analyse the kinetic data. The apparent activation energy of leaching was found to depend on the particle size of the solid — the values 57.8 and 48.5 kJ mol −1 were obtained for the leaching of particles of −100+90 and −180+160 μm, respectively. It was concluded that the leaching process is controlled by the chemical reaction of MgO with H + ions at the liquid–solid interface and by pore diffusion.
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