Method for cleaning of aluminum oxide powders

Details Method for cleaning of aluminum oxide powders Method for cleaning of aluminum oxide powders

1997-06-24

1999-06-22

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic synthesis

Utilizing fused bath

C25C 306, C25C 1508

Patent

active

059140240

ABSTRACT:
A method and a cleaning device for the mechanical cleaning of a powder, in particular of primary aluminum oxide, direct the powder against a surface in order to strip particulate impurities adhering to the surface of the powder. The aluminum oxide to be cleaned is introduced into a stripping device having a striking mechanism directing the powder with a speed of 20 to 30 m/s several tens of times per second for a time period of <1 to 10 seconds against impact blades rotating in a direction opposite to the striking mechanism The particles of the cleaned, powder-form aluminum oxide having a size of >10 .mu.m are separated from the cleaned, powder-form aluminum oxide having a size <10 .mu.m and the impurities by an air sifter and/or a cyclone and are fed for smelting electrolysis. The powder-form aluminum oxide having a size <10 .mu.m and the impurities are fed to a waste dump or are further processed as raw material.

REFERENCES:
patent: 4050999 (1977-09-01), Johnson
patent: 4525181 (1985-06-01), Bockman
patent: 4576690 (1986-03-01), Fields et al.

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