Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1982-09-30
1983-12-20
Hall, James R.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264117, B01J 200
Patent
active
044217013
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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