US4278643A
Expired / Lapsed
US
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Resin sorption process for extracting tungsten
Assignee: Osram Sylvania Inc
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Filing: 1980-09-15
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Granted: 1981-07-14
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Expires: 2000-09-15
Abstract
Abstract In a resin sorption process for recovering tungsten from solutions containing high levels of contaminating boron by employing a resin copolymer of 8-hydroxyquinoline, a polyamine, resorcinol, and formaldehyde (HPRF resins), the improvement comprises a two step desorption of metal values from the loaded resin consisting of a first step of washing the loaded resin with a solution of a weakly acidic salt to remove a portion of the boron from the loaded resin, followed by a second step of washing the loaded resin with a solution of a weakly basic salt to remove a portion of the tungsten from the loaded resin, whereby the tungsten recovered is substantially free of contaminating boron.
Inventors
- 👤 Samuel Natansohn
- 👤 Sophia R. Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:37
CPC Classifications
C; C01; C01G; C01G41/00; C01G41/003; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
In a process for recovering tungsten values from a solution containing boron comprising the steps of contacting said solution with a resin comprising a copolymer of 8-hydroxyquinoline, a polyamine, resorcinol, and formaldehyde to load said resin with metal values; and desorbing the metal values from said loaded resin to recover the tungsten; the improvement comprises a two step desorption of metal values from said loaded resin including a first step of contacting said loaded resin with a solution of a weakly acidic salt to remove a portion of the boron from said loaded resin, followed by a second step of contacting said loaded resin with a solution of a weakly basic salt to remove a portion of the tungsten from said loaded resin, whereby the tungsten recovered by said improvement is substantially free of boron.
Claim 2
Dependent Claim
135 words
In a process for recovering tungsten values from a solution containing boron comprising the steps of contacting said solution with a resin comprising a copolymer of 8-hydroxyquinoline, a polyamine, resorcinol, and formaldehyde to load said resin with metal values; and desorbing the metal values from said loaded resin to recover the tungsten; the improvement comprises a two step desorption of metal values from said loaded resin including a first step of contacting said loaded resin with a solution of a weakly acidic salt to remove a portion of the boron from said loaded resin, followed by a second step of contacting said loaded resin with a solution of a weakly basic salt to remove a portion of the tungsten from said loaded resin, whereby the tungsten recovered by said improvement is substantially free of boron.
Claim 3
Dependent Claim
12 words
The process in accordance with claim 1 wherein said polyamine is ethylenediamine.
Claim 4
Dependent Claim
15 words
The process in accordance with claim 1 wherein said weakly acidic salt comprises ammonium chloride.
Claim 5
Dependent Claim
15 words
The process in accordance with claim 1 wherein said weakly basic salt comprises sodium carbonate.
Claim 6
Dependent Claim
155 words
In a process for recovering tungsten values from a solution containing boron comprising the steps of passing said solution through a bed of a resin comprising a copolymer of 8-hydroxyquinoline, a polyamine, resorcinol, and formaldehyde to load said resin bed with metal values, and eluting the loaded resin bed to recover the tungsten; the improvement comprises a two step elution of metal values from said loaded resin bed including a first step of eluting said loaded resin bed with from 1/2 to 5 bed volumes of a solution of a weakly acidic salt to remove a portion of the boron from said loaded resin bed, followed by a second step of eluting said loaded resin bed with from 1/2 to 5 bed volumes of a solution of a weakly basic salt to remove a portion of the tungsten from said loaded resin bed, whereby the tungsten recovered by said improvement is substantially free of boron.
Claim 7
Dependent Claim
155 words
In a process for recovering tungsten values from a solution containing boron comprising the steps of passing said solution through a bed of a resin comprising a copolymer of 8-hydroxyquinoline, a polyamine, resorcinol, and formaldehyde to load said resin bed with metal values, and eluting the loaded resin bed to recover the tungsten; the improvement comprises a two step elution of metal values from said loaded resin bed including a first step of eluting said loaded resin bed with from 1/2 to 5 bed volumes of a solution of a weakly acidic salt to remove a portion of the boron from said loaded resin bed, followed by a second step of eluting said loaded resin bed with from 1/2 to 5 bed volumes of a solution of a weakly basic salt to remove a portion of the tungsten from said loaded resin bed, whereby the tungsten recovered by said improvement is substantially free of boron.
Claim 8
Dependent Claim
12 words
The process in accordance with claim 5 wherein said polyamine is ethylenediamine.
Claim 9
Dependent Claim
27 words
The process in accordance with claim 4 wherein said solution of a weakly acidic salt comprises from about 0.05 M to about 0.5 M ammonium chloride solution.
Claim 10
Dependent Claim
27 words
The process in accordance with claim 5 wherein said solution of a weakly basic salt comprises from about 0.1 M to about 1 M sodium carbonate solution.
Claim 11
Dependent Claim
26 words
The process in accordance to claim 1 or claim 5 wherein the molar ratio of boron to tungsten in said recovered tungsten is less than 0.05.
References Cited (Backward Citations)
US4180628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |