Patent US3958986A successfully refreshed from Google Patents.
US3958986A
Expired / Lapsed
US
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Process for recovery of zinc values from zinc waste
Assignee: Individual
•
Filing: 1974-05-30
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Granted: 1976-05-25
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Expires: 1994-05-30
Abstract
Abstract Process for recovery of zinc and other metal values from zinc waste or other metal waste containing chlorine and/or other anions forming undesirable metal salts. The waste is leached with a liquid organic phase containing a cation exchanger. The impurities are removed from the organic phase with water, and the zinc and other metal values are extracted from the organic phase with mineral acid. Thereafter the zinc and other metal values can be recovered with known methods.
Inventors
- 👤 Gunnar Thorsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:09
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/34; H01F27/343
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A process for recovering zinc from a solid waste material containing zinc oxide and chlorine which comprises: a. leaching said solid waste material with a liquid organic phase containing a liquid cation exchanger to obtain an organic solution of a zinc organic complex containing chlorine; b. separating said chlorine from said zinc complex by washing said organic phase with water or an aqueous alkaline solution; and c. contacting said organic phase with an aqueous solution of a mineral acid to obtain a precipitation of a zinc salt or an aqueous solution of said zinc salt.
Claim 2
Dependent Claim
95 words
A process for recovering zinc from a solid waste material containing zinc oxide and chlorine which comprises: a. leaching said solid waste material with a liquid organic phase containing a liquid cation exchanger to obtain an organic solution of a zinc organic complex containing chlorine; b. separating said chlorine from said zinc complex by washing said organic phase with water or an aqueous alkaline solution; and c. contacting said organic phase with an aqueous solution of a mineral acid to obtain a precipitation of a zinc salt or an aqueous solution of said zinc salt.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said cation exchanger is a carboxylic acid.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said carboxylic acid contains from 9 to 11 carbon atoms per molecule.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said cation exchanger is an alkyl phosphoric acid.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said alkyl phosphoric acid is di(2-ethylhexyl)-phosphoric acid.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein said mineral acid is sulphuric acid and said zinc salt is zinc sulphate.
References Cited (Backward Citations)
US3441372A
Cited
US3532490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |