Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1988-08-23
1993-02-09
Morris, Theodore
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 54, 423606, C01G 3900, C01G 3902
Patent
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.
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Chereslowsky Michael J.
Mendenhall Robert G.
Scheftic Judy L.
GTE Products Corporation
Morris Theodore
Quattrini L. Rita
Walter Robert E.
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