Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group vib metal
Patent
1980-02-11
1981-06-23
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group vib metal
75101BE, 423DIG14, C01G 3900, C01G 4100
Patent
active
042750393
ABSTRACT:
The invention relates to the production of tungsten having a low impurity content of molybdenum from impure minerals such as scheelite.
An aqueous acidic feed solution containing both molybdenum and tungsten, and also containing enough hydrogen peroxide to depolymerize heteropolymers of tungsten and molybdenum and prevent precipitation in the extractant, is contacted with an extractant composition comprising an organic phosphoric acid, a trialkyl phosphate and a tri-alkyl phosphine oxide in an hydrocarbon diluent. By selecting an appropriate combination of pH and hydrogen peroxide content of the feed, contents of the components of the extraction composition and temperature of extraction, selective extraction of molybdenum can be obtained. In some particularly preferred embodiments, the feed pH is in the range of 0.85 to 1.5, the mole ratio of hydrogen peroxide to tungsten and molybdenum is 0.6 to 1.0, the temperature of extraction is in the range 12.degree. to 20.degree. C. and the extractant composition comprises 8-15% di-2-ethylhexyl phosphosphoric acid from 8-15% tributyl phosphate, 2-3% tributyl phosphine oxide and at least 70% hydrocarbon diluent of low aromatics content.
The metal values can be stripped from the organic phase by a dilute aqueous alkali solution or an acidic aqueous hydrogen peroxide solution and can be recovered from the raffinate and stripping solution by precipitation.
REFERENCES:
patent: 3576595 (1971-04-01), Chiola et al.
patent: 3607007 (1971-04-01), Chiola et al.
patent: 3607008 (1971-04-01), Chiola et al.
patent: 3751555 (1973-08-01), Peterson
patent: 3969478 (1976-07-01), Zelikman et al.
Burkin Alfred R.
Ozensoy Erol
Carter Herbert T.
Interox Chemicals Limited
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