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Calcium hydroxytitanate formed in Bayer digestion process of chinese diasporic bauxite was studied.Interplanar spacings of calcium hydroxytitanate crystal were determined by XRD analysis.Only one endothermicpeak occurs at 550～560℃ on the DTA curve of this compound.IR spectrometry study has revealed that hydroxyl doesexist in calcium hydroxytitanate instead of crystal water.Observation under SEM has indicated that its crystal grains arein the shape of regular hexagonal plates with 2～8μm in edge length and less than 1 μm in thickness.The influences of various digestion conditions on the formation and transformation of calcium hydroxytitanate andother Ca-Ti-containing compounds,such as lime addition;content and distribution state of TiO_2 in bauxite;digestiontemperature and retention time,were further studied.
Calcium hydroxytitanate formed in Bayer digestion process of chinese diasporic bauxite was studied.Interplanar spacings of calcium hydroxytitanate crystal were determined by XRD analysis. One last one end michaelpeak at 550-560 ° C on the DTA curve of this compound. IR spectrometry study has revealed that hydroxyl doesexist in calcium hydroxytitanate instead of crystal water. Observation under SEM has indicated that its crystal grains are in the shape of regular hexagonal plates with 2 ~ 8 μm in edge length and less than 1 μm in thickness. These 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 TiO_2 in bauxite; digestion temperature and retention time, were further studied.