Patent US3933971A successfully refreshed from Google Patents.
US3933971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molybdenum recovery
Assignee: EIDP Inc
•
Filing: 1975-02-18
•
Granted: 1976-01-20
•
Expires: 1995-02-18
Abstract
Abstract A process for the recovery of metal values, principally molybdenum, by contacting an acidic aqueous solution containing iron, copper and sulfate ions in addition to the metal values to be recovered with an alkyl amine dissolved in a water-insoluble liquid hydrocarbon and subsequently contacting the resultant organic phase in multiple stages at controlled pH.
Inventors
- 👤 Everett Ira Baucom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:11
CPC Classifications
C; C01; C01G; C01G39/00; C01G39/003
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
171 words
A process for the recovery of metal values from acidic aqueous solutions comprising ions of molybdenum, iron and sulfate and wherein nitrate is less than one gram per liter of solution comprising (a) contacting said aqueous solution with an extractant consisting essentially of a substantially water-insoluble liquid hydrocarbon having at least 0.15 moles per liter of hydrocarbon of an alkyl amine dissolved therein while maintaining said aqueous solution at a pH of less than about 1.3 to selectively extract molybdenum and sulfate ions into the organic phase and thereafter separating the aqueous phase from the organic phase, (b) contacting the organic phase from step (a) with an aqueous solution maintained at a pH in the range of about 1.3 to about 4.5 to selectively strip sulfate ions from the organic phase and thereafter separating the aqueous phase from the organic phase, (c) contacting the organic phase from step (b) with an aqueous solution maintained at a pH of at least about 4.5 to strip the molybdenum values from said organic phase.
Claim 2
Dependent Claim
171 words
A process for the recovery of metal values from acidic aqueous solutions comprising ions of molybdenum, iron and sulfate and wherein nitrate is less than one gram per liter of solution comprising (a) contacting said aqueous solution with an extractant consisting essentially of a substantially water-insoluble liquid hydrocarbon having at least 0.15 moles per liter of hydrocarbon of an alkyl amine dissolved therein while maintaining said aqueous solution at a pH of less than about 1.3 to selectively extract molybdenum and sulfate ions into the organic phase and thereafter separating the aqueous phase from the organic phase, (b) contacting the organic phase from step (a) with an aqueous solution maintained at a pH in the range of about 1.3 to about 4.5 to selectively strip sulfate ions from the organic phase and thereafter separating the aqueous phase from the organic phase, (c) contacting the organic phase from step (b) with an aqueous solution maintained at a pH of at least about 4.5 to strip the molybdenum values from said organic phase.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the alkyl amine is a tertiary amine containing 18-54 carbon atoms and the liquid hydrocarbon is an aromatic hydrocarbon containing 6-18 carbon atoms.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein said amine is present in said hydrocarbon at a concentration of 0.15 -0.4 moles per mole of hydrocarbon.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein said concentration is in the range 0.2-0.3 moles per mole of hydrocarbon.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein the tertiary amine contains 18-39 carbon atoms.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein the pH of the aqueous solution is maintained in the following ranges 1. Step (a) -- 0.5-1.3
2. Step (b) -- 1.3-4.5
3. Step (c) -- greater than 5.5
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein said amine is present in said hydrocarbon at a concentration of 0.15-0.4 moles per mole of hydrocarbon.
Claim 9
Dependent Claim
13 words
The process of claim 7 wherein said tertiary amine contains 18-39 carbon atoms.
Claim 10
Dependent Claim
33 words
The process of claim 8 wherein the pH of the aqueous solution is maintained in the following ranges 1. Step (a) -- 0.8-1.0
2. Step (b) -- 3.5-4.5
3. Step (c) -- 7.0-10.0.
Claim 11
Dependent Claim
23 words
The process of claim 9 wherein the amine is present in said hydrocarbon at a concentration of 0.2-0.3 moles per mole of hydrocarbon.
References Cited (Backward Citations)
US3083085A
Cited
US3458277A
Cited
US3455677A
Cited
US3576595A
Cited
US3681016A
Cited
US3739057A
Cited
US3770869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |