Process and equipment for the production of ultrafine powders pa

Details Process and equipment for the production of ultrafine powders pa Process and equipment for the production of ultrafine powders pa

1975-03-20

1976-11-16

Custer, Jr., Granville Y.

Solid material comminution or disintegration

Processes

241 23, B02C 2300

Patent

active

039919439

ABSTRACT:
A process is disclosed for conversion of coal powder of 4 micron size into a finer powder of the order of 1/400 micron by passing through a vertical tube of sufficient length at a temperature of -77.degree. C and thereafter passing through a second chamber by force of gravity where a counter stream of heated nitrogen at 780.degree. C causes the powder to break up into the smaller size particles.

REFERENCES:
patent: 1311645 (1919-07-01), Foss
patent: 1679857 (1928-08-01), France
patent: 3797757 (1974-03-01), Marshall

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