Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1981-01-09
1981-12-22
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 58, 423593, 23301, C01G 3900
Patent
active
043070655
ABSTRACT:
For rapid and efficient recovery of dissolved molybdenum from spent acid, the spent acid solution is first diluted to a predetermined acid-water volume ratio and anhydrous ammonia added thereto to raise the solution temperature to at least about 90.degree. C. The solution temperature is maintained at less than boiling and the ammonia addition continued until the solution pH is from about 1.5 to about 3.5. The partially neutralized solution is then seeded with solid ammonium molybdate particles in order to hasten the onset of nucleation. The seeded solution is maintained at a temperature of at least about 90.degree. C. but less than the boiling temperature for a period of from about one hour to about four hours in order to precipitate substantially all molybdenum therefrom as ammonium molybdate. Thereafter, the precipitated ammonium molybdate is separated from the residual solution.
REFERENCES:
patent: 1250063 (1917-12-01), Westling et al.
patent: 1948407 (1934-02-01), Watts
patent: 3393971 (1968-07-01), Vanderpool et al.
patent: 3963823 (1976-06-01), Kulkami
Carter Herbert T.
Palmer W. D.
Westinghouse Electric Corp.
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