摘要
Calcium hydroxytitanate formed in the Bayer digestion process of Chinese diasporic bauxite was studied. Interplanar spacings of calcium hydroxytitanate crystal were determined by XRD analysis. Only one endothermic peak occurs at 550-560°C on the DTA curve. IR spectrometry has revealed that hydroxyl exists in calcium hydroxytitanate instead of crystal water. Observation under SEM has indicated that the crystal grains are in the shape of regular hexagonal plates 2-8 μm in edge length and less than 1 μm in thickness. The influences of various digestion conditions on the formation and transformation of calcium hydroxytitanate and other Ca-Ti-containing compounds such as lime addition, content and distribution state of TiO2 in bauxite, digestion temperature and retention time were studied.
Calcium hydroxytitanate formed in the Bayer digestion process of Chinese diasporic bauxite was studied. Interplanar spacings of calcium hydroxytitanate crystal were determined by XRD analysis. Only one endothermic peak occurs at 550-560°C on the DTA curve. IR spectrometry has revealed that hydroxyl exists in calcium hydroxytitanate instead of crystal water. Observation under SEM has indicated that the crystal grains are in the shape of regular hexagonal plates 2-8 μm in edge length and less than 1 μm in thickness. The influences of various digestion conditions on the formation and transformation of calcium hydroxytitanate and other Ca-Ti-containing compounds such as lime addition, content and distribution state of TiO2 in bauxite, digestion temperature and retention time were studied.
