Process for the recovery of tantalum values

Details Process for the recovery of tantalum values Process for the recovery of tantalum values

1984-02-29

1985-01-22

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vb metal

423 62, 423 68, C01G 3500

Patent

active

044951582

ABSTRACT:
Tantalum is recovered from an impure source containing niobium, tungsten, titanium, iron, and other impurities by a process comprising mixing the impure source with an alkali metal carbonate, drying the resulting mixture, heating the dried mixture to convert the tungsten to a soluble form, leaching to solubilize the tungsten, digesting the resulting leached solids containing tantalum in hydrochloric acid to solubilize iron values and a portion of the titanium values, dissolving the leached solids containing tantalum values in hydrofluoric acid, adjusting the pH of the resulting solution to form a first tantalum precipitate, dissolving the first tantalum precipitate in oxalic acid adjusting the pH to form a second tantalum precipitate, dissolving and digesting the second tantalum precipitate in hydrochloric acid solution to form a third tantalum precipitate of high purity.

REFERENCES:
patent: 1802242 (1931-04-01), Fink et al.
patent: 2773737 (1956-12-01), Nielsen et al.
patent: 3099526 (1963-07-01), Li et al.
patent: 4302243 (1981-11-01), Tamaru et al.

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