Precipitation of magnesium carbonate (original) (raw)

. Precipitation of magnesium carbonate. Hydrometallurgy, 22: 249-258. The Mg (HCO:~)2 solution obtained by pressure carbonation of hydrated MgO is decomposed by heating to form MgCQ of high purity. Factors which influence the precipitation of MgCO:~, such as temperature, concentration, seeding, aeration and stirring, have been studied. Results of tests carried out with A.R. grade MgC12 and Na2CO~ at various temperatures are reported. The activation energies calculated from the rate equations were 63-85 kJ mol-', which suggests a chemically controlled reaction mechanism. 0304-386X/89/$03.50