Iron-containing refractory balls for retorting oil shale

Plastic and nonmetallic article shaping or treating: processes – Spheroidizing or rounding of solid particles

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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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