Improved hydration resistance of CaO granules via sol‐processed metal oxide protective layers
Bingrong Li, Yaowu Wei, Jinhu Wang, Junfeng Chen, Nan Li
Abstract
Abstract Well‐sintered CaO granules with hydration resistance are very important for the manufacturing and application of CaO‐containing refractories. CaO granules with sol‐processed metal oxide protective layers were prepared by granulation and surface treatment. The obtained results indicated that the usage of nano sol greatly improved the hydration resistance of CaO granules, especially when the CaO granules were treated by alumina sol. The promoting effect of nano sols in the sintering processes improved the density of CaO granules. Nanoparticles reacted with lime at lower temperature and a new phase was formed uniformly in the treated layer, which promoted densification of the treated layer. The grain size of CaO granules in the treated layer was increased obviously with the promotion of sintering. Moreover, nanoparticles were favorable for the formation of direct bonding between CaO grains by decreasing the dihedral angle.