Process and apparatus for the preparation of pulverulent metal o

Details Process and apparatus for the preparation of pulverulent metal o Process and apparatus for the preparation of pulverulent metal o

1991-11-04

1993-06-15

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

264 42, 423593, 501 80, 501 84, 501 85, 505737, C01B 1318, C04B 3804

Patent

active

052198294

ABSTRACT:
The invention relates to a process and an apparatus for converting metal nitrate or mixed metal nitrate solutions into the corresponding metal oxides in a microwave field. The invention consists in heating, while the feed stream is being metered in, in such a manner that the solvent always evaporates within seconds and the decomposition product is obtained as a porous, sponge-like, purely oxidic material, which can be ground easily to give a powder having particle sizes of 0.5 to about 10 .mu.m. The controlled metering in of the nitrate solution simultaneously makes it possible to control the reaction temperature below the sintering temperature of the powder. The reaction of the nitrate starting solution can take place continuously/batchwise in a reaction flask or continuously in a rotating reaction pipe, which is preferably charged with grinding balls, which possibly exert a reaction-activating effect similar to that exerted very particularly by the metal oxide sponge formed during the reaction.

REFERENCES:
patent: 4004933 (1977-01-01), Ravault
patent: 4444723 (1984-04-01), Matsumaru
patent: 4983573 (1991-01-01), Bolt
patent: 5081102 (1992-01-01), Gay

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