US 4,624,703 AGranted

Recovery of tungsten, scandium, iron, and manganese values from tungsten bearing material

AssigneeGTE Products Corporation

InventorsClarence D. Vanderpool, Martin B. MacInnis, Judith A. Ladd

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Abstract

A process is disclosed for recovering tungsten, scandium, iron, and manganese from tungsten bearing material. The process involves digesting the material in sufficient sulfuric acid at a sufficient temperature for a sufficient time in the presence of a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion residue containing the major portion of the tungsten, separating the digestion solution from the digestion residue and extracting essentially all of the scandium from the solution with an organic consisting essentially of an extracting agent which is a dialkyl phosphoric acid which is present in an amount sufficient to extract essentially all of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent. The scandium containing organic is removed from the raffinate and stripped of the scandium with an aqueous ammonium carbonate solution which is separated from the stripped organic. The pH of the raffinate is adjusted to at least about 2 with a base and electrolyzed to remove the major portion of the iron as iron powder, which is separated from the resulting electrolyzed solution which contains the major portion of the manganese.

Claims9

Dependent claims

A process for recovering tungsten, scandium, iron, and manganese from tungsten bearing material, said process comprising:

(a) digesting said material in sufficient sulfuric acid at a sufficient temperature for a sufficient time in the presence of a reducing agent to form a digestion solution containing the major portion of said scandium, iron, and manganese, and a digestion residue containing the major portion of said tungsten;
(b) separating said digestion solution from said digestion residue;
(c) extracting essentially all of said scandium from said digestion solution with an organic solution consisting essentially of an extracting agent which is a dialkyl phosphoric acid which is present in an amount sufficient to extract essentially all of the scandium without extracting iron and manganese, and the balance an essentially aromatic solvent;
(d) separating the resulting scandium-containing organic from the resulting raffinate;
(e) stripping the scandium from the scandium-containing organic with an aqueous solution of ammonium carbonate to form a scandium-containing ammonium carbonate solution;
(f) separating said scandium-containing ammonium carbonate from the resulting stripped organic solution;
(g) adjusting the pH of said raffinate to at least about 2 with a base;
(h) subjecting the resulting pH adjusted raffinate to an electric current for a sufficient time to electrolyze said raffinate and form iron powder containing the major portion of the iron which was in said raffinate and an electrolyzed solution containing the major portion of the manganese;
and
(i) separating said iron powder from said electrolyzed solution.

7 more elements

Dependencies are inferred from the claim text.