Abstract: To provide a basic foundation for the ceramic application of red mud，and take the red mud from a Hejin Aluminum Plant as a case，effects of sintering temperature on the phase transformation and physical properties are studied.The results showed that the main crystalline phases of red mud samples are Gehlenite，Quartz，and a small amount of Albite，Morimotoite and Andradite.When the temperature higher than 1 000 ℃，Quartz，Albite and Morimotoite in sintered samples are gradually reduced，but Gehlenite and Andradite increased with the sintering temperature increased.The proper sintering temperature of red mud was at 1 150 ℃，with the bulk density of red mud samples of 1.82 g/cm³，water absorption of 19.9%，porosity of 36.0% and compressive strength of 58.8 MPa.The increase of Gehlenite and Andradite in red mud at a high temperature and the glass phase played an important role in developing the strength of red mud samples and promoting the ceramic mechanism of red mud.

Key words: Red mud, Sintering, Ceramic, Phase, Physical properties