Method for producing fine size yellow molybdenum trioxide powder

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal

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423 54, 423606, C01G 3900, C01G 3902

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active

051851334

ABSTRACT:
A method is disclosed for producing fine size molybdenum trioxide powder which involves heating ammonium dimolybdate in ambient atmosphere at a temperature of from about 455.degree. C. to about 465.degree. C. for a time of from about 5 hours to about 6 hours to produce a first molybdenum trioxide which is granulated to about -10 mesh and then heated in a furnace in which there are three heating zones. The first molybdenum trioxide is heated in the first heating zone at a temperature of from about 550.degree. C. to about 590.degree. C., in the second heating zone at a temperature of from about 580.degree. C. to about 610.degree. C. and thereafter in the third heating zone at a temperature of from about 580.degree. C. to about 625.degree. C., with the feed rate of material in the three zones being from about 1.5 to about 3.0 kg/hr to produce a yellow molybdenum trioxide. The yellow molybdenum trioxide is then cooled and granulated to about -40 mesh. The molybdenum trioxide thus produced has a particle size of from about 2.0 to about 10.0 micrometers in diameter and a surface area of from about 0.1 to about 1.5 M.sup.2 /g.

REFERENCES:
patent: 3848049 (1974-11-01), Ronzio et al.
patent: 3932580 (1976-01-01), Vertes et al.
patent: 3957946 (1976-05-01), Ronzio et al.
patent: 4207296 (1980-06-01), Nauta et al.
patent: 4595412 (1986-06-01), Brunelli et al.

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