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Leaching of particulate dead-burned magnesite with hydrochloric acid at 45 °C was investigated with special regard to the effectof acid concentration (from 0.1 M to 4.8 M) on the rate of chemical dissolution of magnesium, calcium and iron. The leaching process wasfound to be mostly selective in the initial stage and the differences in dissolution rates decreased with an increase in the fraction of deadburnedmagnesite reacted.

Thorough kinetic analysis of the magnesia leaching based on measuring the changes in lixiviant composition revealed that there are differences between the actual leaching behaviour and predictions obtained using the non-porous shrinking particle model (NSPM). A detailed study of the morphology of the solid during the leaching process using SEM showed that observed deviations from the NSPM model depend on the particle size; chemical (mineralogical) composition and the polycrystalline nature of magnesia.