Pulverizing technique and rolling mill for use therein
AssigneeEVT Energie- und Verfahrenstechnik GmbH
InventorBodo Gehrke
Life of this patent
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Abstract
Vibration in the operation of a rolling mill is minimized by mixing unground raw material with partially ground material being recirculated in such a manner that the material fed to the bowl of the mill is homogeneously mixed whereby variations in the frictional forces within the bowl will be reduced. If necessary, the moisture content of the mixture being fed into the mill bowl may be increased to ensure that the grinding operation is performed efficiently.
Claims8
In a grinding mill having a rotatable bowl with associated grinding rollers, the mill having drive means for imparting rotation to the bowl and further having means for delivering raw material to be ground to the bowl, ground material which overflows the bowl being entrained in a carrier gas, the mill also including means for separating partially ground material of particle size above a preselected minimum from the carrier gas stream for return to the bowl for further grinding, the improvement comprising:
- stirring means located upstream of the mill bowl in the direction of material flow, said stirring means establishing a stirring zone to which the raw material and separated partially ground material is delivered, said stirring means homogeneously mixing the raw material and partially ground material and releasing said mixture to the mill bowl.
Dependencies are inferred from the claim text.