| 摘要 |
A fluidized bed jet mill for grinding particulate material comprising: a) a grinding chamber having a peripheral wall, a base, and a central axis; b) an impact target with a hollow cavity defined thereby, and with at least three apertures transversing the walls thereof, said target being mounted within said grinding chamber and centered on said central axis of said grinding chamber; and c) a plurality of sources of high velocity gas, said gas sources being mounted in said grinding chamber in said peripheral wall, arrayed symmetrically about said central axis, and oriented to direct high velocity gas along an axis substantially perpendicularly intersecting said central axis within said impact target, each of said sources of high velocity gas comprising a nozzle having an internal diameter; wherein said impact target has a cross section area in a plane parallel to said central axis, and said cross section area is greater than said cross section area of said internal diameter of said nozzle; and wherein the distance between said impact target and any of said nozzles is greater than said internal diameter of said nozzle.
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