Method and installation for production of cement clinker
AssigneeKHD Humboldt Wedag GmbH
InventorsHubert Ramesohl, Hans-Wilhelm Meyer
Life of this patent
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Abstract
In the production of cement clinker or cement with the addition of a cement additive (40), such as for example slag, which is ground in a closed-circuit grinding installation into slag meal (32) of equal fineness to cement, in order to utilize excess slag capacity in a beneficial way in the cement clinker production process, an intermediate slag fraction (33, 34) withdrawn from a three-fraction classifying device (31) is added as a raw material component to the stock inlet of the rotary kiln (20) of the cement clinker production line, and at the same time the chemical composition of the remaining raw material components (10) is adapted to the added quantity (34) of the intermediate slag fraction.
Claims2
A method of production of Portland slag cement in an installation having a rotary kiln, a clinker cooler, a clinker grinder and a heat exchange train for preheating raw meal through which off gases from said rotary kiln and clinker cooler flow in route to the rotary kiln, comprising of steps of:
- feeding ground raw meal to said rotary kiln via said heat exchanger train,
- grinding slag separate from said raw meal in a closed circuit grinding installation having a roll press and a three fraction classifying device which classifies the slag into a fines fraction having a fineness <32 μm, an intermediate fraction having a fineness of <200 μm and >32 μm and a oversize fraction having a fineness >200 μm, said oversize fraction being recirculated to said roll press,
- delivering said intermediate fraction and said preheated raw meal to said rotary kiln in which a cement clinker is produced,
- cooling said cement clinker, and
- delivering said cooled cement clinker and said fines fraction to said clinker grinder to produce Portland slag cement having a fineness of <32 μm.
Dependencies are inferred from the claim text.