Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1988-04-04
1989-03-21
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
423 87, C01G 3900
Patent
active
048141488
ABSTRACT:
A method is disclosed for purifying ammonium dimolybdate which comprises dissolving ammonium dimolybdate containing arsenic as an impurity in water to form an ammonium molybdate solution and insolubles containing essentially all of the arsenic, filtering off the insolubles from the solution, adjusting the pH of the solution to at least about 9.0 and then crystallizing pure ammonium dimolybdate from the solution wherein the arsenic content is less than about 8 weight ppm.
REFERENCES:
patent: 3829550 (1974-08-01), Ronzio et al.
patent: 4457776 (1984-07-01), Van't Sant et al.
patent: 4702895 (1987-10-01), Cheresnowsky et al.
patent: 4741886 (1988-05-01), Vanderpool et al.
Cheresnowsky Michael J.
Scheftic Judy L.
Castle Donald R.
Doll John
GTE Products Corporation
Langel Wayne A.
Quatrini L. Rita
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