Plastic and nonmetallic article shaping or treating: processes – Spheroidizing or rounding of solid particles
Patent
1980-11-24
1983-02-01
Hall, James R.
Plastic and nonmetallic article shaping or treating: processes
Spheroidizing or rounding of solid particles
264 60, 264 85, 264113, 264117, 264112, 264131, 264141, 427190, 427191, 427201, 428404, 428472, B01J 200
Patent
active
043714811
ABSTRACT:
Iron-containing refractory balls, in a retorting process for oil shale, permit effective magnetic separation of the balls from the spent shale. These ceramic balls can be made by a process such as admixing powdered alumina and water to form an extrudable mixture, extruding to form cylinders, reshaping cylinders into balls, overcoating with iron particles, further overcoating with alumina, and firing.
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Hall James R.
Phillips Petroleum Company
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