Magnetite electrostatographic carriers

Details Magnetite electrostatographic carriers Magnetite electrostatographic carriers

G - Physics

03

G

18/508, 96/52

G03G 9/08 (2006.01) C04B 35/653 (2006.01) G03G 9/107 (2006.01) H05H 1/00 (2006.01)

Patent

CA 1068461

MAGNETITE ELECTROSTATOGRAPHIC CARRIERS ABSTRACT OF THE DISCLOSURE In preferred form, the inventive concept utilizes a carbon arc plasma flame assembly wherein magnetic ore particles are fed to the plasma flame assembly in the presence of an inert non-oxydizing, gaseous atmosphere. The plasma flame assembly comprises a cathode and at least two carbon anodes to which is fed oxygen gas in a controlled amount. Upon contact with the plasma flame, the ore particles become molten droplets which fall by gravity into a spheroidization column having a controlled atmosphere. As the molten droplets fall, they cool and become spheroidal particles. The chamber wherein the heating occurs is sub- stantially sealed and is initially purged with inert gas. In addition, the spheroidization column is fitted with an exhaust system which maintains the integrity of the process- ing atmosphere and that of the spheroidized particles.

241799

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