Patent US4284606A successfully refreshed from Google Patents.
US4284606A
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US
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Extraction
Assignee: RTL Contactor Holding SA
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Filing: 1978-11-27
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Granted: 1981-08-18
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Expires: 1998-11-27
Abstract
Abstract A process as described for extracting at least two desired constituents from a mineral using a liquid reagent which produces the constituents, or compounds thereof, in separable form and independently extracting those constituents, or compounds thereof. The process if especially valuable for the extraction of phosphoric acid and metal values, such as uranium from phosphate rock.
Inventors
- 👤 John S. Rendell
- 👤 Maurice J. Cahalan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:18
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/46; C01B25/461; C01B25/463; C01B25/462; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/026; C22B60/0265
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A process for the extraction of phosphoric acid and metal values from phosphate rock comprising acidulating the phosphate rock to convert the phosphate of the rock into phosphoric acid; contacting a slurry of the acidulated rock with selective extractants for phosphoric acid and metal values contained in the slurry; removing the extractants substantially independently of the solids of the slurry; and recovering the phosphoric acid and metal values.
Claim 2
Dependent Claim
68 words
A process for the extraction of phosphoric acid and metal values from phosphate rock comprising acidulating the phosphate rock to convert the phosphate of the rock into phosphoric acid; contacting a slurry of the acidulated rock with selective extractants for phosphoric acid and metal values contained in the slurry; removing the extractants substantially independently of the solids of the slurry; and recovering the phosphoric acid and metal values.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein said phosphoric acid and metal values are extracted simultaneously.
Claim 4
Dependent Claim
50 words
A process according to claim 1, wherein the phosphoric acid and metal values are extracted from the slurry by passing the slurry and selective extractants for said phosphoric acid and metal values in countercurrent in substantially separate phases, while causing the slurry to be repeatedly showered through the extractant stream.
Claim 5
Dependent Claim
24 words
A process according to claim 1, wherein the extractants are mutually immiscible liquids which are also immiscible with the aqueous phase in the contactor.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the extractant for the metal values is a lightweight particulate ion-exchange resin.
Claim 7
Dependent Claim
15 words
A process according to claim 1, wherein the phosphate rock is acidulated with sulphuric acid.
Claim 8
Dependent Claim
15 words
A process according to claim 1, wherein the phosphoric acid is extracted with n-butyl alcohol.
Claim 9
Dependent Claim
101 words
A process for the extraction of phosphoric acid and uranium values from phosphate rock comprising: acidulating the phosphate rock with sulphuric acid to convert the phosphate of the rock into phosphoric acid; contacting a slurry of the acidulated rock with n-butyl alcohol as extractant for phosphoric acid and the lightweight particulate ion-exchange resin capable of capturing uranyl ions by passing the slurry and extractants in countercurrent in substantially separate phases, while causing the slurry to be repeatedly showered through the extractant stream; removing the extractants substantially independently of the solids of the slurry; and recovering the phosphoric acid and uranium values.
Claim 10
Dependent Claim
101 words
A process for the extraction of phosphoric acid and uranium values from phosphate rock comprising: acidulating the phosphate rock with sulphuric acid to convert the phosphate of the rock into phosphoric acid; contacting a slurry of the acidulated rock with n-butyl alcohol as extractant for phosphoric acid and the lightweight particulate ion-exchange resin capable of capturing uranyl ions by passing the slurry and extractants in countercurrent in substantially separate phases, while causing the slurry to be repeatedly showered through the extractant stream; removing the extractants substantially independently of the solids of the slurry; and recovering the phosphoric acid and uranium values.
Claim 11
Dependent Claim
16 words
Phosphoric acid and metal values when extracted from phosphate rock by the process of claim 1.
Claim 12
Dependent Claim
16 words
Phosphoric acid and uranium values when extracted from phosphate rock by the process of claim 8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |