Recovery of molybdenum values from alkali molybdate solutions
Abstract
Abstract A HIGHLY PURE AMMONIUM MOLYBDATE SOLUTION IS OBTAINED FROM AN IMPURE MOLYBDENUM SOURCE BY A PROCESS THAT COMPRISES DIGESTING THE MOLYBDENUM SOURCE IN AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE, ADJUSTING THE PH OF THE RESULTING SOLUTION TO FROM ABOUT 1 TO ABOUT 4 TO FORM AN AQUEOUS FEED SOLUTION, CONTACTING THE AQUEOUS FEED SOLUTION WITH AN ORGANIC EXTRACTANT SOLUTION CONSISTING ESSENTIALLY OF A TRIALKYL AMINE, AN ALKYL PHOSPHATE ESTER AND A WATER-INSOLUBLE HYDROCARBON SOLVENT TO EXTRACT AT LEAST SOME OF THE MOLYBDENUM INTO THE ORGANIC SOLUTION, SEPARATING THE MOLYBDENUM-LADEN ORGANIC SOLUTION FROM THE RESULTING MOLYBDENUM-BARREN RAFFINATE, CONTACTING THE MOLYBDENUM-LADEN ORGANIC SOLUTION WITH AN AQUEOUS SOLTUION CONTAINING AMMONIUM IONS TO REMOVE AT LEAST SOME MOLYBDENUM FROM THE ORGANIC SOLUTION AND SEPARATING THE ORGANIC SOLUTION AND THE AQUEOUS SOLUTION CONTAINING AMMONIUM AND MOLYBDENUM.
Inventors
- 👤 Vincent Chiola
- 👤 Fred W Liedtke
- 👤 Clarence D Vanderpool
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |