Abstract: Based on the Chinese bauxite character and the status of the traditional sintering process, the intensified sintering process was studied. In the charge, the mass ratio of alumina to silica is 9.62, calcium ratio 1.3-2.0, alkali ratio 1.0, and then the charge is sintered above 1250℃. It is convenient for sinter to be leached, and the secondary reaction appears little. The slurry after sinter leaching is transferred into autoclave for desilicification at about 170℃, and the siliceous modulus of solution reaches more than 200. Then some lime is added for deep-desilication at normal pressure, the siliceous modulus of solution increases more than 600 even if the Al₂O₃ content is more than 200g/L.The SiO₂ coefficient in hydrate garnet from deep-desilication is more than 0.28. Under conditions of the addition of seed and application of novel technology of carbonization, the contents of Na₂O and SiO₂ in product are less than 0.37% and 0.025%, respectively. When surfactant is added into spent liquor in the evaporation, the concentration of Na₂O_T can reach more than 300g/L, and the scale on the heating surface can be abated obviously. With the application of intensified sintering process the output of every rotary kiln increases by 19.7%, in the same time the energy consumption of alumina production decreases by 24.71%.

Key words: intensified sintering process; alumina production; technology; application