Hydrometallurgical production of technical grade molybdic oxide

Details Hydrometallurgical production of technical grade molybdic oxide Hydrometallurgical production of technical grade molybdic oxide

1975-08-18

1976-10-26

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 55, 423606, 423 50, 423 53, 423 54, 423 49, C01G 3900

Patent

active

039884180

ABSTRACT:
An improved hydrometallurgical method is provided for producing technical grade molybdic oxide from molybdenite concentrates. According to this method, the molybdenite concentrates are leached in an acid medium having a nitric acid concentration between about 25 gpl and about 50 gpl and an initial sulphuric acid concentration of nil to about 750 gpl, under oxygen pressure of about 100 - 250 psig and at a temperature above 115.degree. C so as to produce technical grade molybdic oxide having not more than 0.1% sulphur. Then a liquid-solid separation of the reaction mixture is effected and the obtained leach liquor is recycled back to the leaching stage optionally after partial neutralization with a basic reagent. The solid is washed and recovered as technical grade molybdic oxide.

REFERENCES:
patent: 3739057 (1973-06-01), Daugherty et al.
Bjorling et al., "Journal of Chemistry, UAR", vol. 12, 1969, pp. 423-435.

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