US4511541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of cadmium and other metals from solution
Assignee: JR Simplot Co
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Filing: 1982-12-02
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Granted: 1985-04-16
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Expires: 2002-12-02
Abstract
Abstract A process for the selective recovery of cadmium, molybdenum, zinc, nickel and other metal values from wet process phosphoric acid and other acidic to slightly basic carrier solutions, wherein the metal-bearing solution is contacted with an organophosphene extractant to precipitate the metal values for subsequent separation from the solution. Separation may be effected by mechanical means or by scrubbing with a water-immiscible organic solvent such as kerosene for subsequent recovery of the metal values. The metal specie recovered is determined by the concentration of the organophosphene, which may be selectively adjusted to recover a series of metal values in a sequence of stages.
Inventors
- 👤 Laurence W. Bierman
- 👤 Samuel M. Polinsky
- 👤 David A. Hempel
- 👤 Roger B. Humberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:39
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/003; C01G11/00; C01G11/003; C01G39/00; C01G39/003; C01G53/00; C01G53/01; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/384; C22B3/385; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
55 words
A process for selectively recovering the metal values of a metal from a carrier solution, comprising the steps of: providing a carrier solution having metal values dissolved therein; contacting the carrier solution with a thio-organophosphene extractant to extract the metal values as a solid precipitate; and separating the precipitated metal values from the carrier solution.
Claim 2
Dependent Claim
55 words
A process for selectively recovering the metal values of a metal from a carrier solution, comprising the steps of: providing a carrier solution having metal values dissolved therein; contacting the carrier solution with a thio-organophosphene extractant to extract the metal values as a solid precipitate; and separating the precipitated metal values from the carrier solution.
Claim 3
Dependent Claim
12 words
The process of claim 1, wherein the carrier solution is phosphoric acid.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein the extractant is dissolved in a water-immiscible organic solvent.
Claim 5
Dependent Claim
41 words
The process of claim 3, wherein the metal specie extracted by the extractant is determined by the concentration of the extractant in the solvent and the relative flow rates of the carrier solution and the solution of extractant in organic solvent.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein the metal specie extracted is selected from the group consisting of cadmium, molybdenum and zinc, and nickel.
Claim 7
Dependent Claim
33 words
The process of claim 1, wherein the extractant is a thio-organophosphene selected from the group consisting of diisobutyldithiophosphene sulfide, tri-n-propylphosphene sulfide, tri-n-octylphosphene sulfide, dicyclohexyl phosphene sulfide, di i-butylphosphene sulfide, dicylohexyldithio-phosphinate and diisobutyl dithiophosphinate.
Claim 8
Dependent Claim
24 words
The process of claim 3, wherein the organic solvent is selected from the solvent group consisting of kerosene, decane, dodecane, toluene, p-xylene, and ethylbenzene.
Claim 9
Dependent Claim
20 words
The process of claim 1, wherein said carrier solution is neutral or basic with a pH less than about 10.
Claim 10
Dependent Claim
130 words
A continuous flow process for successively recovering in stages the metal values of a first metal and a second metal from a carrier stream, comprising the steps of: providing a carrier stream containing at least two different metals dissolved therein; providing a thio-organophosphene extractant capable of extracting metal value from a carrier solution as a metal precipitate; extracting the first metal from the carrier stream using a first extractant stream having a flow rate adjusted to a first level to extract the first metal as a first metal precipitate, leaving a first depleted carrier stream; and extracting the second metal from the first depleted carrier stream using a second extractant stream having a flow rate adjusted to a second level to extract the second metal as a second metal precipitate.
Claim 11
Dependent Claim
130 words
A continuous flow process for successively recovering in stages the metal values of a first metal and a second metal from a carrier stream, comprising the steps of: providing a carrier stream containing at least two different metals dissolved therein; providing a thio-organophosphene extractant capable of extracting metal value from a carrier solution as a metal precipitate; extracting the first metal from the carrier stream using a first extractant stream having a flow rate adjusted to a first level to extract the first metal as a first metal precipitate, leaving a first depleted carrier stream; and extracting the second metal from the first depleted carrier stream using a second extractant stream having a flow rate adjusted to a second level to extract the second metal as a second metal precipitate.
Claim 12
Dependent Claim
116 words
An ion flotation process for selectively concentrating a metallic specie from an aqueous carrier solution, comprising the steps of: providing an aqueous carrier solution having a metal value dissolved therein; contacting the carrier solution to a thio-organophosphene extractant dissolved in a water-immiscible organic solvent to precipitate the metal specie as a solid suspension in the organic solvent phase; separating the organic solvent with the extractant and the suspended metal value contained therein from the depleted carrier solution raffinate; stripping the extractant and suspended metal value from the organic solvent to form a loaded strip stream; and concentrating the metal value from the loaded strip stream, to form a concentrated metallic solution and a depleted strip solution.
Claim 13
Dependent Claim
116 words
An ion flotation process for selectively concentrating a metallic specie from an aqueous carrier solution, comprising the steps of: providing an aqueous carrier solution having a metal value dissolved therein; contacting the carrier solution to a thio-organophosphene extractant dissolved in a water-immiscible organic solvent to precipitate the metal specie as a solid suspension in the organic solvent phase; separating the organic solvent with the extractant and the suspended metal value contained therein from the depleted carrier solution raffinate; stripping the extractant and suspended metal value from the organic solvent to form a loaded strip stream; and concentrating the metal value from the loaded strip stream, to form a concentrated metallic solution and a depleted strip solution.
Claim 14
Dependent Claim
28 words
The process of claim 10, including an additional step of: recovering the extractant from the depleted strip solution for recycling to said contacting step; after said concentrating step.
Claim 15
Dependent Claim
12 words
The process of claim 10, wherein the carrier solution is phosphoric acid.
Claim 16
Dependent Claim
31 words
The process of claim 10, wherein said stripping step is performed with an aqueous solution of a base selected from the group consisting of ammonium hydroxide, sodium hydroxide and potassium hydroxide.
Claim 17
Dependent Claim
13 words
The process of claim 10, wherein said concentrating step is by ion exchange.
Claim 18
Dependent Claim
55 words
The process of claim 11, wherein said recovering step includes the steps of: adding to the depleted strip solution a mineral acid to form an acidic aqueous solution; contacting the acidic aqueous solution to the organic solvent to transfer the extractant to the organic phase; and separating the acidic aqueous solution from the organic phase.
Claim 19
Dependent Claim
82 words
An ion flotation process for selectively extracting metal values from a carrier solution, comprising the steps of: providing an aqueous carrier solution having metal values dissolved therein; precipitating a metal value from the carrier solution with a thio-organophosphene extractant; scrubbing the carrier solution having the precipitated metal value therein with a water immiscible organic liquid to separate the precipitated metal value from the aqueous carrier solution as a solid; and separating the metal value from the extractant and from the organic liquid.
Claim 20
Dependent Claim
82 words
An ion flotation process for selectively extracting metal values from a carrier solution, comprising the steps of: providing an aqueous carrier solution having metal values dissolved therein; precipitating a metal value from the carrier solution with a thio-organophosphene extractant; scrubbing the carrier solution having the precipitated metal value therein with a water immiscible organic liquid to separate the precipitated metal value from the aqueous carrier solution as a solid; and separating the metal value from the extractant and from the organic liquid.
Claim 21
Dependent Claim
31 words
The process of claim 16, wherein the selective extractant is initially dissolved in the organic liquid, so that said precipitating step and said scrubbing step are performed in a single operation.
Claim 22
Dependent Claim
125 words
An ion flotation process for selectively concentrating cadmium from wet process phosphoric acid, comprising the steps of: providing wet process phosphoric acid having cadmium values dissolved therein; contacting the phosphoric acid to a solution of a thio-organophosphene extractant dissolved in an organic solvent to precipitate the cadmium values as a suspension in the organic phase, thereby forming a cadmium-loaded organic phase; stripping the cadmium values and the extractant from the cadmium-loaded organic phase with an aqueous solution of ammonium hydroxide and ammonium sulfate to form a cadmium-loaded aqueous strip stream; passing the cadmium-loaded aqueous strip stream through an ion exchange column to transfer the cadmium values to an ion exchange resin; and eluting the cadmium values from the ion exchange resin with a mineral acid.
Claim 23
Dependent Claim
125 words
An ion flotation process for selectively concentrating cadmium from wet process phosphoric acid, comprising the steps of: providing wet process phosphoric acid having cadmium values dissolved therein; contacting the phosphoric acid to a solution of a thio-organophosphene extractant dissolved in an organic solvent to precipitate the cadmium values as a suspension in the organic phase, thereby forming a cadmium-loaded organic phase; stripping the cadmium values and the extractant from the cadmium-loaded organic phase with an aqueous solution of ammonium hydroxide and ammonium sulfate to form a cadmium-loaded aqueous strip stream; passing the cadmium-loaded aqueous strip stream through an ion exchange column to transfer the cadmium values to an ion exchange resin; and eluting the cadmium values from the ion exchange resin with a mineral acid.
Claim 24
Dependent Claim
53 words
The process of claim 18, including an additional step of: recovering the extractant from the cadmium-depleted aqueous strip stream flowing from the ion exchange column by adding a mineral acid and contacting the resulting acidic aqueous solution to the organic solvent to transfer the extractant into the organic solvent; after said passing step.
Claim 25
Dependent Claim
27 words
The process of claim 13, wherein said stripping step is performed with a basic solution also containing a dissolved anion to solubilize the metal ion being stripped.
Claim 26
Dependent Claim
42 words
The process of claim 20 wherein the dissolved anion is supplied by a salt from the group consisting of: sodium sulfate, potassium sulfate, ammonium sulfate, sodium chloride, potassium chloride, ammonium chloride, sodium nitrate, potassium nitrate, ammonium nitrate, calcium chloride and calcium nitrate.
Claim 27
Dependent Claim
158 words
A batch process for successively recovering in stages the metal values of a first metal and second metal from a carrier solution, comprising the steps of: providing a carrier solution containing at least two different metals dissolved therein; providing a thio-organophosphene extractant capable of extracting metal value from a carrier solution as a metal precipitate; adding a first amount of the extractant to the carrier solution, the concentration of extractant in the carrier solution being sufficient to extract the first metal, thereby forming a first metal precipitate and a first depleted carrier solution; separating the first metal precipitate from the first depleted carrier solution; adding a second amount of the extractant to the first depleted carrier solution, the concentration of extractant in the first depleted carrier solution being sufficient to extract the second metal, thereby forming a second metal precipitate and a second depleted carrier solution; and separating the second metal precipitate from the second depleted carrier solution.
Claim 28
Dependent Claim
158 words
A batch process for successively recovering in stages the metal values of a first metal and second metal from a carrier solution, comprising the steps of: providing a carrier solution containing at least two different metals dissolved therein; providing a thio-organophosphene extractant capable of extracting metal value from a carrier solution as a metal precipitate; adding a first amount of the extractant to the carrier solution, the concentration of extractant in the carrier solution being sufficient to extract the first metal, thereby forming a first metal precipitate and a first depleted carrier solution; separating the first metal precipitate from the first depleted carrier solution; adding a second amount of the extractant to the first depleted carrier solution, the concentration of extractant in the first depleted carrier solution being sufficient to extract the second metal, thereby forming a second metal precipitate and a second depleted carrier solution; and separating the second metal precipitate from the second depleted carrier solution.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |