Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1974-12-23
1976-05-18
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 54, 423 58, 423 61, 423593, 423606, C01G 3900
Patent
active
039579468
ABSTRACT:
A process for purifying concentrates of molybdenum oxide containing a variety of naturally-occurring contaminating metals, such as potassium, copper, calcium, magnesium, iron, aluminum, lead, zinc, bismuth, and the like, as well as compounds thereof, by roasting the impure concentrate at an elevated temperature in an oxygen atmosphere to convert sub-oxides of molybdenum to molybdenum trioxide and contaminating metal molybdites to corresponding metal molybdates, which are extracted by a hot aqueous leaching of the concentrate and the solubilized molybdate ions are recovered. The aqueous leached concentrate, after separation from the aqueous leach solution, is leached with an ammoniacal leach solution for converting the molybdenum trioxide constituent therein into soluble ammonium molybdate compounds, and the resultant leach solution is removed from the remaining insoluble residue, which is discarded. The ammoniacal leach solution containing only minimal quantities of remaining contaminating metal ions can be further purified by passage through a chelating cation exchange resin, whereafter the ammonium molybdate compounds are recovered, such as by evaporative crystallization, to produce a high purity ammonium dimolybdate (ADM) product, or alternatively, can be calcined at an elevated temperature to produce a high purity molybdenum trioxide product.
REFERENCES:
patent: 2876065 (1959-03-01), Zimmerley et al.
patent: 3458277 (1969-07-01), Platzhe et al.
patent: 3829550 (1974-08-01), Ronzio et al.
patent: 3848049 (1974-11-01), Ronzio et al.
Oberg Fred N.
Rickard R. Stanley
Ronzio Richard A.
Ziegler Robert C.
Amax Inc.
Carter Herbert T.
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