Moreover, MgO solubility in aqueous solutions is very low; considering the suspension's high concentration, there is a huge degree of solid–liquid interface. At these interfaces, kinetic pro- 2. cesses occur, such as the rearrangement and adsorption of water molecules at the surface. This also comprises the formation of a hydrated intermediated Mg(OH)2, which is associated with the dissolution of powdered MgO (Mejias et al., 1999). However, the agglomeration of magnesia particles in the dense suspension