Method and apparatus for heat treatment of pulverous material

Details Method and apparatus for heat treatment of pulverous material Method and apparatus for heat treatment of pulverous material

C - Chemistry, Metallurgy

04

B

C04B 2/10 (2006.01) B01J 6/00 (2006.01) C04B 7/44 (2006.01) F27B 15/00 (2006.01)

Patent

CA 2044429

By a method for heat treatment of pulverous material, e.g. burning of lime, the lime is first preheated by means of exit gas in a preheater (1, 2, 3) and subsequently burnt in a calci- ner (4, 14), after which the burnt lime is cooled in a cooler (6, 7). In order to being able to alter the reactivity of the finish- burnt lime, the calciner is divided into two chambers, namely a first chamber (4) in which the lime is burnt at, e.g. 1050°C and a second chamber (14) in which a larger or smaller portion of the lime is further burnt at a higher temperature, e.g. 1300°C. By means of a splitting gate (16) in the outlet from a separa- tion cyclone (5) for the calciner (4, 14), it is possible to determine the size of the portion of lime which should be ex- posed to the higher burning temperature in the second calciner chamber (14) and consequently to predetermine the reactivity of the finish-burnt lime.

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