Apparatus for manufacturing powdered silicon nitride

Details Apparatus for manufacturing powdered silicon nitride Apparatus for manufacturing powdered silicon nitride

1986-03-11

1987-02-03

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With apparatus using centrifugal force

34 36, 34 66, 432 58, F26B 1700, F26B 300, F26B 1900, F27B 1500

Patent

active

046400230

ABSTRACT:
A batch-operated furnace apparatus for manufacturing powdered silicon nitride comprises a reaction furnace having a reaction chamber, an upper portion, a bottom portion and a side portion, a feed pipe placed at the upper portion of the reaction furnace for feeding starting materials in a fine or coarse particle form, an exhaust pipe placed at the upper portion of the reaction furnace for removing gasses from the reaction chamber, a gas distributor plate positioned at the bottom portion of the reaction chamber for introducing nitrogen gas into the reaction chamber so as to form a fluidized bed at the bottom portion of the reaction chamber, a heater for heating the starting materials of the fluidized bed within the reaction chamber, a discharge port formed in the gas distributor plate, a discharge pipe joined to the discharge port of the gas distributor plate, a valve seat formed at the discharge port, a discharge valve means having the valve which engages the valve seat of the discharge port, and a guide tube provided at an upper portion of the reaction furnace. The discharge valve means extends through the guide tube in a vertical direction in such a way that the valve of the discharge valve means selectively contacts the valve seat of the discharge port thereby to open or close the discharge port.

REFERENCES:
patent: 2528098 (1950-10-01), White
patent: 4020564 (1977-05-01), Bayliss

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