B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
B02C 17/16 (2006.01) B02C 17/18 (2006.01) B02C 23/12 (2006.01) C03C 3/083 (2006.01) C03C 3/085 (2006.01) C03C 3/087 (2006.01)
Patent
CA 2618864
The method of converting nepheline syenite particulate feedstock with a grain size profile to an ultra-fine grain finish product for subsequent commercial use, the ultra--fine grain final product has a maximum grain size of less than about 6 microns. The method comprising: providing a dry feedstock with a controlled maximum particle size greater than about 20 microns; grinding the feedstock in a dry state by passing the feedstock vertically downward through a continuous, high-speed stirred ball mill whereby the feedstock is ground into an intermediate powder having a drastically reduced grain size profile than the grain size profile of the feedstock; and passing the intermediate powder from the mill through an air classifier using a rapidly moving high speed air stream moving along a given path to convey the ultra-fine grain product along the path and from the classifier and to allow coarse particulate material including particles larger than the ultra--fine product to be separated and then expelled from the classifier.
Duran Sanchez Mauricio
Gonzalez Acevedo Artemio
Hernandez Gonzalez Gerardo
Schlesinger Louis M.
Gowling Lafleur Henderson Llp
Unimin Corporation
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