The application discloses a method for digesting and separating fluorinated aluminum by program, which comprises the following steps: placing a catalyst with
metal elements supported on
alumina as a carrier into a reaction container of a cluster
digestion device, adding
hydrochloric acid and / or
nitric acid, setting a
digestion program, introducing
inert gas for pre-pressurization, performing primary
digestion, and simultaneously starting a condensation
reflux atomizer; after the program is completed, adding
hydrofluoric acid, setting a digestion program, and performing secondary digestion; after the digestion is completed, entering a cooling and
crystallization program, performing cooling and
crystallization, and separating to obtain a sample solution to be detected and a
solid; the
solid is dried and calcined to obtain fluorinated aluminum crystals, and the liquid is used for detecting the content of
metal elements. The method is applied to the
digestion treatment of the
alumina sample with
metal elements supported thereon, has a
large sample treatment range, complete digestion, no volatile loss of elements, and can separate AlF3 in an alpha
crystal form through the program digestion of the digestion device.