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US4035269A
Expired / Lapsed
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Process for the galvanic purification of the waste waters
Assignee: SnamProgetti SpA
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Filing: 1975-08-14
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Granted: 1977-07-12
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Expires: 1995-08-14
Abstract
Abstract A method for removing metals from waste liquids without the use of an externally supplied source of current. The method consists in (i) immersing in the waste liquid at a pH of less than 3.5, two materials which are different from each other and the metal to be removed, one of the immersed materials being electropositive, the other being carbon or electronegative, (ii) connecting the two immersed materials to each other, thus giving rise to an electric current, (iii) precipitating the metal or metals to be removed, and (iv) recovering the purified waste liquid.
Inventors
- 👤 Nunzio Mastrorilli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:27
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/70; C02F1/705; C02F1/46; C02F1/461; C02F1/46104; C02F1/46176; C02F2101/00; C02F2101/10; C02F2101/20; C02F2101/22; C02F2103/00; C02F2103/02; C02F2103/023; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S210/913; Y10S210/914
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A process for the purification of waste waters by the removal of chromium therefrom without any energy supply from outside the system, said method comprising in (i) sending the liquid which is to be treated to a vessel and immersing in the liquid at a pH of less than 3.5 carbon and zinc; (ii) connecting the carbon and zinc to each other to give rise to an electric current; (iii) precipitating chromium as an hydroxide; and (iv) recovering the substantially chromium-free liquid.
Claim 2
Dependent Claim
82 words
A process for the purification of waste waters by the removal of chromium therefrom without any energy supply from outside the system, said method comprising in (i) sending the liquid which is to be treated to a vessel and immersing in the liquid at a pH of less than 3.5 carbon and zinc; (ii) connecting the carbon and zinc to each other to give rise to an electric current; (iii) precipitating chromium as an hydroxide; and (iv) recovering the substantially chromium-free liquid.
Claim 3
Dependent Claim
86 words
A process for the purification of waste waters by the removal of mercury therefrom without any energy supply from outside the system, said method comprising in (i) sending the liquid which is to be treated to a vessel and immersing in the liquid at a pH of less than 3.5 iron and amalgamated copper; (ii) connecting the iron and amalgamated copper to each other to give rise to an electric current; (iii) precipitating mercury as an elemental metal; and (iv) recovering the substantially mercury-free waste liquid.
Claim 4
Dependent Claim
86 words
A process for the purification of waste waters by the removal of mercury therefrom without any energy supply from outside the system, said method comprising in (i) sending the liquid which is to be treated to a vessel and immersing in the liquid at a pH of less than 3.5 iron and amalgamated copper; (ii) connecting the iron and amalgamated copper to each other to give rise to an electric current; (iii) precipitating mercury as an elemental metal; and (iv) recovering the substantially mercury-free waste liquid.
Claim 5
Dependent Claim
84 words
A process for the purification of waste waters by the removal of chromium therefrom without any energy supply from outside the system, said method consisting in (i) sending the liquid which is to be treated to a vessel and immersing in the liquid at a pH of less than 3.5 iron and amalgamated copper; (ii) connecting the iron and amalgamated copper to each other to give rise to an electric current; (iii) precipitating chromium as hydroxide; and (iv) recovering the substantially chromium-free waste liquid.
Claim 6
Dependent Claim
84 words
A process for the purification of waste waters by the removal of chromium therefrom without any energy supply from outside the system, said method consisting in (i) sending the liquid which is to be treated to a vessel and immersing in the liquid at a pH of less than 3.5 iron and amalgamated copper; (ii) connecting the iron and amalgamated copper to each other to give rise to an electric current; (iii) precipitating chromium as hydroxide; and (iv) recovering the substantially chromium-free waste liquid.
Claim 7
Dependent Claim
83 words
A process for the purification of waste waters by the removal of mercury therefrom without any energy supply from outside the system, said method consisting in (i) sending the liquid which is to be treated to a vessel and immersing in liquid at a pH of less than 3.5 zinc and carbon; (ii) connecting the zinc and carbon to each other to give rise to an electric current; (iii) precipitating mercury as an elemental metal; and (iv) recovering the substantially mercury-free waste liquid.
Claim 8
Dependent Claim
83 words
A process for the purification of waste waters by the removal of mercury therefrom without any energy supply from outside the system, said method consisting in (i) sending the liquid which is to be treated to a vessel and immersing in liquid at a pH of less than 3.5 zinc and carbon; (ii) connecting the zinc and carbon to each other to give rise to an electric current; (iii) precipitating mercury as an elemental metal; and (iv) recovering the substantially mercury-free waste liquid.
References Cited (Backward Citations)
US2292314A
Cited
US3389060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |