US3966569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering metal from metalliferous waste
Assignee: Mx-Processer Reinhardt and Co AB
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Filing: 1975-02-25
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Granted: 1976-06-29
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Expires: 1995-02-25
Abstract
Abstract Metal can be recovered from metal-containing waste by means of liquid extraction processes. The waste is leached with sulphuric acid. The resulting metal sulphate solution is contacted with an organic solution of a reagent, so as to extract iron and zinc to the organic solution. The organic solution is washed with sulphuric acid in two steps, viz. with weaker acid in the first step, so as to transfer zinc to the washing solution, and with stronger acid in the second step, so as to transfer iron to the washing solution. Zinc and iron have now been separated, and are recovered from the washing solutions in known ways, for example by crystallization. If the waste contains other metals, in addition to iron and zinc, additional selective liquid extraction processes are added, before or after the iron-zinc-extraction.
Inventors
- 👤 Hans Reinhardt
- 👤 Harald Daniel Ottertun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:36
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/38; C22B3/384; C22B3/3842; C01; C01G; C01G9/00; C01G9/003; C02; C02F; C02F1/00; C02F1/26; C22B19/00; C22B19/20; C22B19/26; C22B3/04; C22B3/06; C22B3/08; C22B3/30; C22B3/36; C22B3/362; C22B3/364; C22B3/3844; C22B3/3846; C22B3/385; C22B7/00; C22B7/006; C22B7/007; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A method of recovering metal from solid metalcontaining waste, such as metal hydroxide slime, comprising leaching the waste with sulphuric acid to form a metal sulphate solution having a pH value of 0-5, contacting the metal sulphate solution in a liquid extraction process with an organic solution containing an organophosphorous acid to transfer iron and zinc from the metal sulphate solution to the organic solution, contacting the organic solution in a first washing operation with an aqueous solution containing 50-200 g/1 free sulphuric acid for selectively transferring zinc from the organic solution to said aqueous sulphuric acid solution, recovering zinc from said aqueous sulphuric acid solution, contacting the organic solution in a second washing operation with an aqueous solution containing 500-1000 g/1 free sulphuric acid for selectively transferring iron from the organic solution to said aqueous sulphuric acid solution, and recovering iron from said aqueous sulphuric acid solution.
Claim 2
Independent Claim
148 words
A method of recovering metal from solid metalcontaining waste, such as metal hydroxide slime, comprising leaching the waste with sulphuric acid to form a metal sulphate solution having a pH value of 0-5, contacting the metal sulphate solution in a liquid extraction process with an organic solution containing an organophosphorous acid to transfer iron and zinc from the metal sulphate solution to the organic solution, contacting the organic solution in a first washing operation with an aqueous solution containing 50-200 g/1 free sulphuric acid for selectively transferring zinc from the organic solution to said aqueous sulphuric acid solution, recovering zinc from said aqueous sulphuric acid solution, contacting the organic solution in a second washing operation with an aqueous solution containing 500-1000 g/1 free sulphuric acid for selectively transferring iron from the organic solution to said aqueous sulphuric acid solution, and recovering iron from said aqueous sulphuric acid solution.
Claim 3
Dependent Claim
83 words
A method as claimed in claim 1, comprising leaching the metal-containing waste at a pH value of 0-5 with an aqueous solution of sulphuric acid in a quantity to produce a metal sulphate solution having a metal content of 30-60 g/1, filtering the small sulphate solution, washing the insoluble residues from the leaching operation with water, and diluting the filtered metal sulphate solution with water from the washing operation to produce a metal sulphate solution having a metal content of approximately 15 g/1.
Claim 4
Dependent Claim
165 words
A method as claimed in claim 1 for recovering metal from solid metal-containing waste wherein said waste additionally contains copper, nickel and chromium, comprising contacting the metal sulfate solution in a first liquid extraction process with a first organic solution containing a member of the group consisting of (a) a mixture of an alkyl 2-hydroxybenzophenone oxime with alpha-hydroxy oxime and (b) 8-hydroxyquinoline to transfer copper from the metal sulfate solution to said first organic solution, contacting the metal sulfate solution in a second liquid extraction process with a second organic solution containing an organophosphorus acid to transfer iron and zinc from the metal sulfate solution to said second organic solution, contacting the metal sulfate solution in a third liquid extraction process with a third organic solution containing a dialkyl dithiophosphoric acid to transfer nickel from the metal sulfate solution to said third organic solution, neutralizing the metal sulfate solution, thus treated, to precipitate chromium as chromium hydroxide, and separating said chromium hydroxide from the solution.
Claim 5
Dependent Claim
51 words
A method as claimed in claim 3, comprising contacting said first organic solution with an aqueous solution containing 200-1000 g/1 free sulphuric acid to transfer copper from the organic solution to said aqueous sulphuric acid solution, and recovering copper from said aqueous sulphuric acid solution by means of electrolysis or crystallization.
Claim 6
Dependent Claim
25 words
A method as claimed in claim 4, in which the aqueous solution contains approximately 300 g/1 free sulphuric acid, and copper is recovered by electrolysis.
Claim 7
Dependent Claim
25 words
A method as claimed in claim 3, in which said first, second and third liquid extraction processes are each performed at substantially the same temperature.
Claim 8
Dependent Claim
21 words
The method as in claim 6 wherein each liquid extraction is performed at a temperature of about from 25° to 50°C.
Claim 9
Dependent Claim
51 words
A method as claimed in claim 3, comprising contacting said third organic solution with an aqueous solution containing 200-1000 g/1 free sulphuric acid to transfer nickel from the organic solution to said aqueous sulphuric acid solution, and recovering nickel from said aqueous sulphuric acid solution by means of electrolysis or crystallization.
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |