Method and apparatus for heat treatment of fine-grained material

Details Method and apparatus for heat treatment of fine-grained material Method and apparatus for heat treatment of fine-grained material

1997-09-09

1999-07-06

Marcantoni, Paul

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106762, C04B 748

Patent

active

059193018

ABSTRACT:
The invention relates to the heat treatment of fine-grained material which is first of all preheated in a multi-stage cyclone preheater, then further heated in a calcination zone, next finally burnt in a kiln and then cooled. Preheated material and tertiary air are delivered to the reaction chamber of the calcination zone in order to maintain therein a reducing atmosphere for reduction of the NO.sub.X content in the kiln exhaust gases. For the purpose of good adjustability of the reaction temperature in the reaction chamber and for the purpose of a space-saving construction, the preheated material from the second-lowest preheating stage as well as tertiary air are introduced at the bottom into the reaction chamber and an adjustable part-quantity of the preheated material from the third-lowest preheating stage is introduced into an upper region of the calcination zone.

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