Plasma-arc process for production of powders of chemical...

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B01J 19/08 (2006.01) B01J 12/00 (2006.01) C01B 21/06 (2006.01) C01B 31/30 (2006.01) C01B 35/04 (2006.01) C01G 23/00 (2006.01) C01G 23/02 (2006.01) C22B 4/00 (2006.01) C22C 1/05 (2006.01) C22C 1/10 (2006.01) H05H 1/42 (2006.01)

Patent

CA 1072049

ABSTRACT OF THE DISCLOSURE A plasma-arc process is disclosed for the production of powders of various chemical products, according to endothermical reactions such as TiC and the like. The process consists essential ly in carrying out, in a furnace with an anodic function without dissipative cooling, a series of steps comprising: (a) forming a chemically reactive fluidodynamic mass hav ing a high thermal content and a high concentration of the desired reactive species, by injecting into the electronic column of a plasma-arc of a noble gas at least one reactant selected from the class consi- sting of metal and metalloid halides, the injection taking place, with mixing through a choker-injector- mixer nozzle which is electrically insulated; (b) causing the electronic condensation of said mass in side a main nozzle anode without dissipative cooling and (c) injecting into said electronically condensed mass the residual part of said reactants necessary to the desired main chemical reaction for producing the che mical powder. The total volume of the reactants is equal to or greater than 20% of the total aeriform volume formed by the total volume of the reactants plus the volume of noble gas that pilots and stabi- lizes the plasma-arc itself. The electronic condensation takes place inside a nozzle-shaped main anode without dissipative (forc ed) cooling, which nozzle anode is made of tungsten or graphite, and preferably the latter. Powders hav ing the function of nucleation such as dispersion agents, may also be introduced into the reaction zone. If desired, a subsequent reaction may be brought about by the chemical and/or physical inter reaction of one or more reactants introduced into a zone of the furnace located below the zone in which the main reaction takes place. The process also contemplates the use of hydrogen only as a reactant of a desired chemical reaction, said hydro gen being injected into the fluidodynamic mass only after this latter has condensed itself electronical ly inside the nozzle-shaped main anode. Examples are given wherein TiC powder is produced from TiCl4 and CH4, employing only argon as the gas for the plasma-arc.

271810

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