| 摘要 |
The invention relates to a continuous, two-stage process for complete dehydration and subsequent calcination of aluminum fluoride hydrates. The known processes used for this purpose are satisfactory for producing relatively small quantities of aluminum fluoride. In the production of larger quantities of aluminum fluoride however several problems arise with respect to trouble free control and supervision of the process and maintainance of the equipment. The disadvantages which up to now have been mainly due to the process itself are removed by the combination of the following process steps: (a) Dehydrating the aluminum fluoride hydrate in a first step, to produce aluminum semi-hydrate AlF3.0.5H2O by means of a generally known method (b) heating the aluminum semi-hydrate in a second stage in an indirectly heated, horizontal rotary kiln to remove the remaining water of crystallization, and then calcining at ca. 500 DEG -600 DEG C. |
