Recovery of refractory hard metal powder product

Details Recovery of refractory hard metal powder product Recovery of refractory hard metal powder product

1976-12-20

1978-03-21

Peters, G. O.

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

423297, 423409, 423411, 423439, 423440, 75 5BB, 250427, 204164, 55523, C01B 3130, C01B 2106, C01B 3504

Patent

active

040804313

ABSTRACT:
Finely divided borides, carbides, and nitrides of metals of Groups III-VI of the Periodic Table, formed by reacting vaporous metal halide and a boron, carbon, or nitrogen source reactant at high temperatures, e.g., 1500.degree. C., are separated from gaseous reactor effluent stream at temperatures between about 200.degree. C. and 1500.degree. C. with the use of a porous sintered filter. By separating the finely divided product from the effluent stream before the stream cools to below about 200.degree. C., adsorption of impurities, e.g., unreacted metal halide or metal subhalides, on the product is reduced. The use of a filter, e.g., a porous sintered filter, avoids the size classification of product which may result when cyclones and a bag filter are used to collect product.

REFERENCES:
patent: 3244482 (1966-04-01), Culburtson et al.
patent: 3253886 (1966-05-01), Lamprey et al.
patent: 3661523 (1972-05-01), Sheppard et al.
patent: 3840750 (1974-10-01), Davis et al.
patent: 3979500 (1976-09-01), Sheppard et al.

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