Patent ID: 6271501
Filing Date: 2001-08-07
Classification: F27B,F27D

Abstract:
A method of heating a solid particulate material to a temperature of 1000.degree. to 1700.degree. C. under a vacuum comprising:producing a rotating refractory metal cylindrical vessel having inner and outer walls, a cool inlet zone, a hot intermediate zone, and a cool exit zone, a first series of inner radiation shields at said hot intermediate zone adjacent said cool inlet zone and a second series of inner radiation shields at said hot intermediate zone adjacent said cool exit zone,moving solid particulate matter through said rotating refractory metal cylindrical vessel while under a vacuum;heating said solid particulate metal to a temperature of 1000.degree. to 1700.degree. C. in said hot intermediate zone; and discharging said heated solid particulate material from said cool exit zone.