US4828661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of metals from metal/plastic waste
Assignee: MR METALL-RECYCLING GmbH
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Filing: 1987-12-11
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Granted: 1989-05-09
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Expires: 2007-12-11
Abstract
Abstract The invention relates to a process for recovery of metals from metal/plastic waste using used etching and washing solutions from the electronics industry, with the following process steps: (a) heating of the metal/plastic waste in a heating bath in order to separate the metal from the plastic; (b) dissolution of the metal component in the optionally regenerated etching and washing solutions; (c) conversion of the dissolved metal component into the sulfate through treatment with ion exchanger; (d) electrolytic deposition and, if appropriate, selective separation of the metal component into the individual metals, and (e) regeneration of the ion exchanger with reformation of the reusable etching solution.
Inventors
- 👤 Antonio M. Celi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:12
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/006; C22B7/007; C22B1/00; C22B1/005; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A process for recovery of metals from metal/plastic component waste, wherein the process is carried out using used etching and washing solutions from the electronics industry and comprises the following process steps: (a) heating of the metal/plastic waste in a heating bath in order to separate the metal component from the plastic component; (b) dissolving the metal component in the etching and washing solutions; (c) converting the dissolved metal component into the sulfate form of the metal through treatment with an ion exchanger; (d) electrolytically depositing and, if appropriate, selectively separating the metal component into the individual metals; and (e) regenerating the ion exchanger using dilute sulfuric acid while reforming the reusable etching solution.
Claim 2
Dependent Claim
114 words
A process for recovery of metals from metal/plastic component waste, wherein the process is carried out using used etching and washing solutions from the electronics industry and comprises the following process steps: (a) heating of the metal/plastic waste in a heating bath in order to separate the metal component from the plastic component; (b) dissolving the metal component in the etching and washing solutions; (c) converting the dissolved metal component into the sulfate form of the metal through treatment with an ion exchanger; (d) electrolytically depositing and, if appropriate, selectively separating the metal component into the individual metals; and (e) regenerating the ion exchanger using dilute sulfuric acid while reforming the reusable etching solution.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1, wherein the heating of the metal/plastic waste is carried out in an organic heat-transfer medium bath.
Claim 4
Dependent Claim
35 words
The process as claimed in claim 1 or 2, wherein the metal/plastic waste is heated to above the melting point of the plastic, and the latter is then separated from the heat-transfer medium by cooling.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 2 or 3, wherein the metals melting in the heat-transfer medium bath are removed by decantation.
Claim 6
Dependent Claim
25 words
The process as claimed in claims 1 or 2, wherein the etching and washing solutions used for dissolution of the metal component contain an oxidant.
Claim 7
Dependent Claim
17 words
The process as claimed in claim 5, wherein the etching and washing solutions used contain hydrogen peroxide.
Claim 8
Dependent Claim
38 words
The process as claimed in claim 1, wherein he metal component includes gold or platinum and the gold or platinum contained in the etching and washing solutions from step (b) are recovered through exchange using a cation exchanger.
Claim 9
Dependent Claim
34 words
The process as claimed in claim 1, wherein the metal component includes aluminum and the aluminum contained in the etching and washing solutions from step (b) is recovered through exchange using a cation exchanger.
References Cited (Backward Citations)
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Cited
US4107011A
Cited
US4069110A
Cited
US4118295A
Cited
US4252621A
Cited
US4374008A
Cited
US4652352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |