| 摘要 |
Cement clinker is produced from cold, dry, finely divided raw material by causing hot flue gases to flow in a first direction out of a rotary kiln and suspending a major portion of the finely divided raw material in the hot flue gases until the raw material has been preheated and at least partially decarbonized. The preheated and at least partially decarbonized raw material is introduced into the kiln. A fraction of the cold, dry, finely divided raw material is pneumatically injected into an end of the kiln to flow countercurrently to said first direction approximately parallel to the axis of the kiln to form a dust cloud of the raw material occupying substantially the entire cross section of the kiln at said end, the end being upstream with respect to a second direction of flow of the raw material into the kiln.
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