Abstract:
Apparatus for the continuous dehydration of aluminum fluoride hydrates consisting of a fluidized-bed furnace with a cylindrical furnace jacket and a perforated plate just above the base, a lid to which gas-heated jacket radiant tubes are fixed reaching vertically almost to the said plate each of the tubes being closed at one end and having a concentric inner tube with a burner in the interior and being of almost the same length as the jacket radiant tube as well as open at the bottom so that combustion gas issuing from said burner in the interior of said inner tube flows upward in the tip of the outer tube after a change of direction of 180*. Thus both the fluidized bed outside the jacket radiant tube and, via a recuperator, the air passed to the burner are warmed.