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The phase transitions of the main substances in Bayer red mud in high caustic sodium aluminate solutions were studied. Without addition of lime, cancrinite was not found to transform to CaNaHSiO 4 even with 16wt.% CaO present in the original residue up to 270°C. However, this transition was verified to be a fast reaction which was completed in just 10min with the temperature higher than 240°C...
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