Method for removing arsenic from ammonium dimolybdate

Details Method for removing arsenic from ammonium dimolybdate Method for removing arsenic from ammonium dimolybdate

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.

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