| 摘要 |
A particulate material is heat treated, e.g. calcined, by being passed through a fluidised bed comprising particles of an inert refractory material. Throughout the period in which the particulate material is passing through the fluidised bed, the fluidised bed contains a major proportion by weight of the inert refractory material. The size, shape and density of the particles of inert refractory material and the velocity of the fluidising gas are such that the particles of inert refractory material are retained in the fluidised bed while the particulate material being heat treated is carried through the fluidised bed. The particulate material is retained within the fluidised bed for a time sufficient to effect the desired heat treatment thereof. |
