Claims
- 1. A method for manufacture of vanadyl hydrate comprising the steps of:
- (a) providing an aqueous solution of vanadate ion;
- (b) adding sulfur dioxide and a non-oxidizing acid to said aqueous solution to reduce said vanadate ion to the vanadyl ion;
- (c) solvent extracting said vanadyl ion from said aqueous solution with an organic solvent comprising di-2-ethyl hexyl phosphoric acid or hepta-decyl phosphoric acid;
- (d) stripping said vanadyl ion from said organic solvent with ammonium hydroxide to form in three separate phases, an organic solution, an aqueous solution and a solid precipitate of vanadyl hydrate; and
- (e) separating the solid vanadyl hydrate from said organic and aqueous solutions.
- 2. The method of claim 1 wherein said aqueous solution of step (a) is a water leach solution.
- 3. The method of claim 1 wherein said aqueous solution of step (a) is a solution of metavanadate ion.
- 4. The method of claim 1 wherein said sulfur dioxide is added to said aqueous solution before said non-oxidizing acid is added to said aqueous solution.
- 5. The method of claim 1 wherein said sulfur dioxide and said non-oxidizing acid are simultaneously added to said aqueous solution.
- 6. The method of claim 1 wherein said non-oxidizing acid is sulphuric acid.
- 7. The method of claim 1 wherein said non-oxidizing acid is hydrochloric acid.
- 8. The method of claim 1 wherein said non-oxidizing acid is added to said aqueous solution until a pH in the range of from about 1.0 to about 3.0 is obtained.
- 9. The method of claim 1 wherein said sulfur dioxide is added to reduce said vanadate ion to the vanadyl ion as measured by an e.m.f. potential at a pH of about 2 in the range of from about -150 to about -300 millivolts.
- 10. The method of claim 1 wherein said sulfur dioxide is added in the form selected from the group consisting of sulfur dioxide gas, sulfurous acid and a sulfite salt.
- 11. The method of claim 1 wherein said vanadyl ion is extracted with said organic solvent in a countercurrent extractor having at least two stages.
- 12. The method of claim 1 wherein the pH during extraction is maintained in the range of from about 1.5 to about 3.5 by the addition of a non-oxidizing acid.
- 13. The method of claim 1 wherein said organic solvent comprises a mixture of di-2-ethylhexyl phosphoric acid, isodecanol and kerosene.
- 14. The method of claim 1 wherein said organic solvent comprises a mixture of heptadecyl phosphoric acid, isodecanol and kerosene.
- 15. The method of claim 1 wherein the solid vanadyl hydrate is separated from said solvent by settling in a settler-thickener and then filtering excess liquid from said solid vanadyl hydrate.
Parent Case Info
This application is a continuation of Ser. No. 298,197, filed Aug. 31, 1981, now abandoned, which is a continuation of Ser. No. 106,737, filed Dec. 26, 1979, now abandoned.
US Referenced Citations (15)
Continuations (2)
|
Number |
Date |
Country |
Parent |
298197 |
Aug 1981 |
|
Parent |
106737 |
Dec 1979 |
|