Recovery of refractory hard metal powder product

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

C - Chemistry, Metallurgy

01

B

23/11

C01B 21/06 (2006.01) B01D 46/10 (2006.01) C01B 21/064 (2006.01) C01B 31/30 (2006.01) C01B 35/04 (2006.01)

Patent

CA 1076772

ABSTRACT OF THE DISCLOSURE 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 temper- atures, e.g., 1500°C., are separated from gaseous reactor effluent streamat temperatures between about 200°C. and 1500°C. with the use of a porous sintered filter. By separating the finely divided product from the ef- fluent stream before the stream cools to below about 200°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.

291658

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