Abstract: The invention relates to a classifying mill with a housing configured for containing a stream of particulate material. A particulate material feed inlet is associated with the housing for introducing the particulate material into the housing. A milling assembly is disposed within the housing and configured for grinding the particulate material into fines and oversize particles. A classifier comprising a classifier rotor is disposed within the housing and below the milling assembly. A fines output at the underside of the classifier is configured for extracting the fines from the classifier, and an oversize particle collector at the underside of the classifier is configured for extracting the oversize particles from the housing. The classifying mill is arranged such that the particulate material stream extends downward from the feed inlet, through the milling assembly, and subsequently through the classifier.

Abstract: The invention relates a pulverizer equipped with a free air purging mechanical seal/classifier design that provides free air purging of the seal gap between the mechanical seal assembly and the classifier. The invention also provides a coarse particle extraction assembly wherein the coarse particles rejected by the classifier can be reliably discharged from the pulverizer or recirculated to the inlet. Furthermore, the rejected coarse particles can be subjected to jet milling and then recirculated. The invention also provides a free air cooling arrangement for cooling both the lower bearing member and the area of the vertical drive shaft where it meets the lower bearing member. The invention also provides an improved feed nozzle for use of the pulverizer in drying applications.

Abstract: A cost efficient single-drive particulate material pulverizing and classifying mill capable of operating at high efficiencies and able to conveniently produce selectively sized particles from a wide variety of materials during milling operation without restructuring the mill configuration.

Abstract: A powder classifier which includes a classifier rotor fixedly secured to a rotatable shaft and having (i) an interior portion defined by upper and lower plates and (ii) an impeller wheel having upper and lower surfaces and a plurality of vanes therethrough. The upper plate has a rounded outer edge along its outer circumference, and the interior portion is in communication with a fine particle discharge outlet. First and second annular rings are concentrically disposed about the outer circumference of the classifier rotor, with the first annular ring being positioned so that a preclassification of a feed powder stream occurs at the first gap such that a fraction of fine particles is separated from the feed stream and flows through the first gap and into the interior portion of the classifier rotor for primary classification, A dispersion disk which rotates independently from the classifier rotor is provided to produce various degrees of dispersion intensities and disperses feed powders prior to classification.