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US 4,379,186 AGranted
Fluidizing fine powder
AssigneeITT Industries, Inc.
InventorsEric L. Bush, Ernest J. Workman
Life of this patent
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Abstract
Powder which is too fine to be fluidized on its own is fluidized admixed with a sufficient quantity of coarser powder of a particle size that can be fluidized on its own. The process may be used for coating fine powders with valve-metal for the manufacture of capacitor electrodes.
Claims7
A process of coating inert powder that is too fine to be readily fluidized on its own comprising the step of:
- placing the powder in a fluidization chamber admixed with a sufficient quantity of additional coarse powder of a substantially large particle size, large enough to be capable of being fluidized on its own in said fluidization chamber, the quantity by weight of said fine powder significantly exceeding the quantity by weight of said coarse powder but the ratio by weight of said fine powder to said coarse powder being not more than about 10;
- fluidizing the fine powder with the coarse powder in the chamber with a gas and/or vapor phase fluid;
- and
- coating the fine powder with a valve metal.
1 more element
Dependencies are inferred from the claim text.