| 摘要 |
Hydrothermal transformation process of hydrargillite into boehmite which comprises the preparation of a hydrargillite suspension in water (A) on the basis of 150g/l and 700g/l of dry material expressed in Al<u2>uO<u3>u, the pressurized thermal processing at a temperature comprised between 200`C and 270`C, the temperature raising speed of said suspension being at least 1` C/minute, and letting it stay during a time period comprised between 1 minute and 60 minutes in a stay area (D) at a temperature in the range of 200`C and 270`C. The boehmite obtained has a granulometry at least equal to that of the initial hydrargillite and is very poor in alkaline elements. |
