US4288302A
Expired / Lapsed
US
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Method for electrowinning metal
Assignee: ELECTRODE Corp A DE CORP
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Filing: 1977-01-31
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Granted: 1981-09-08
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Expires: 1997-01-31
Abstract
Abstract Novel dimensionally stable electrodes constituted by a film forming metallic material alloyed with at least one member of the group consisting of metal belonging to Groups VIB, VIIB, VIII, IIB, IB, IVA, lanthanum and lanthanide series of the Periodic Table, such as chromium, manganese, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, gold, zinc, cadmium, silicon, germanium, tin, lead and lanthanum having an electroconductive and corrosion resistant surface preactivated on the surface thereof, preparation of said electrodes, use of said electrodes as anodes for electrolysis in aqueous and organic solutions or in fused salts as well as for cathodic protection and electrolysis methods using said electrodes.
Inventors
- 👤 Vittorio De Nora
- 👤 Giuseppe Bianchi
- 👤 Antonio Nidola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:17
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/055; C25B11/057; C25B11/061; C25B11/063; C25C; C25C7/00; C25C7/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
In the method of electrowinning metals from an aqueous acid electrolyte solution containing dissolved metals therein in an electrolysis cell containing a cathode, and means to pass an electrolysis current through said cell between an anode and a cathode, the novel steps which comprise inserting an anode comprising titanium alloyed with 1 to 50% by weight of at least one metal from Groups VIB, VIIB, VIII, IIB, IB, IVA and lanthanum and lanthanide series of the Periodic Table into said electrolyte and passing an electrolysis current through said cell to release oxygen at said anode and deposit dissolved metal from said solution on the cathode.
Claim 2
Dependent Claim
105 words
In the method of electrowinning metals from an aqueous acid electrolyte solution containing dissolved metals therein in an electrolysis cell containing a cathode, and means to pass an electrolysis current through said cell between an anode and a cathode, the novel steps which comprise inserting an anode comprising titanium alloyed with 1 to 50% by weight of at least one metal from Groups VIB, VIIB, VIII, IIB, IB, IVA and lanthanum and lanthanide series of the Periodic Table into said electrolyte and passing an electrolysis current through said cell to release oxygen at said anode and deposit dissolved metal from said solution on the cathode.
Claim 3
Dependent Claim
36 words
The method of claim 1, in which the anode is an alloy of titanium and from 1 to 50% by weight of a metal from the group consisting of cobalt, nickel, lead, iron, manganese and tin.
Claim 4
Independent Claim
107 words
The method of electrowinning metal in an electrolysis cell containing an anode, a cathode and an acid aqueous electrolyte solution containing the metal to be recovered, which comprises using as the anode an electrically conductive base having at least its outer surface containing a film forming metal or alloy and 0.1 to 50% by weight of at least one member of the group consisting of metals from Groups VIB, VIIB, VIII, IIB, IB, IVA and lanthanum and lanthanide series of the Periodic Table alloyed with the film forming metal, and passing an electrolysis current through said anode and electrolyte to deposit the desired metal on the cathode.
Claim 5
Independent Claim
107 words
The method of electrowinning metal in an electrolysis cell containing an anode, a cathode and an acid aqueous electrolyte solution containing the metal to be recovered, which comprises using as the anode an electrically conductive base having at least its outer surface containing a film forming metal or alloy and 0.1 to 50% by weight of at least one member of the group consisting of metals from Groups VIB, VIIB, VIII, IIB, IB, IVA and lanthanum and lanthanide series of the Periodic Table alloyed with the film forming metal, and passing an electrolysis current through said anode and electrolyte to deposit the desired metal on the cathode.
Claim 6
Dependent Claim
44 words
The method of claim 3, in which the outer surface of the anode is an alloy of titanium with 1 to 50% by weight of one or more metals from the group consisting of manganese, rhenium iron, cobalt, nickel, cadmium, tin, lead and silicon.
Claim 7
Independent Claim
74 words
A method of electrowinning metal comprising electrolyzing an aqueous solution of metal using as an anode an alloy containing one or more film-forming metals selected from the group consisting of titanium, zirconium, niobium and tantalum and one or more of the elements of atomic numbers 24-28 of the Periodic System of Elements, the amount of elements 24-28 being greater than that at which passivation occurs and less than 50% by weight of the alloy.
Claim 8
Independent Claim
74 words
A method of electrowinning metal comprising electrolyzing an aqueous solution of metal using as an anode an alloy containing one or more film-forming metals selected from the group consisting of titanium, zirconium, niobium and tantalum and one or more of the elements of atomic numbers 24-28 of the Periodic System of Elements, the amount of elements 24-28 being greater than that at which passivation occurs and less than 50% by weight of the alloy.
Claim 9
Dependent Claim
27 words
A method as claimed in claim 5 in which the alloy is a titanium-manganese alloy, manganese being present in an amount of 30 to 50 weight %.
Claim 10
Dependent Claim
26 words
A method as claimed in claim 5 in which the alloy is a nickel-titanium alloy, nickel being present in an amount in the range of 35-50%.
Claim 11
Dependent Claim
19 words
A method as claimed in claim 5 in which the anode is a solid anode formed of the alloy.
Claim 12
Dependent Claim
25 words
A method as claimed in claim 5 in which the alloy is an iron-titanium alloy, iron being present in the range of 50-20% by weight.
Claim 13
Dependent Claim
30 words
A method as claimed in claim 5 in which the alloy is a titanium-cobalt alloy, cobalt being present in an amount in the range of 30 to 50% by weight.
Claim 14
Independent Claim
143 words
A method of recovering an electrowinnable metal from an aqueous solution of the metal which comprises the steps of inserting an anode and a cathode into the aqueous solution, connecting the anode to a positive potential with respect to the cathode, passing an electrical current through the anode and the cathode to electrodeposit the metal onto the cathode and removing the cathode deposited metal from the solution, characterized in that the anode has as its electrically conducting surface an alloy containing one or more high melting point passive film-forming metals selected from the group consisting of titanium, zirconium, niobium and tantalum and one or more of the elements of atomic numbers 24-28 of the Periodic System of Elements, the amount of elements 24-28 being greater than that at which passivation of the alloy occurs and less than 50% by weight of the alloy.
Claim 15
Independent Claim
143 words
A method of recovering an electrowinnable metal from an aqueous solution of the metal which comprises the steps of inserting an anode and a cathode into the aqueous solution, connecting the anode to a positive potential with respect to the cathode, passing an electrical current through the anode and the cathode to electrodeposit the metal onto the cathode and removing the cathode deposited metal from the solution, characterized in that the anode has as its electrically conducting surface an alloy containing one or more high melting point passive film-forming metals selected from the group consisting of titanium, zirconium, niobium and tantalum and one or more of the elements of atomic numbers 24-28 of the Periodic System of Elements, the amount of elements 24-28 being greater than that at which passivation of the alloy occurs and less than 50% by weight of the alloy.
Claim 16
Independent Claim
88 words
The method of electrolysis which comprises using a surface oxidized alloy of titanium and 1 to 50% by weight of at least one member of the group consisting of metals from Groups VIB, VII, VIII, IIB, IB, IVA and lanthanum and lanthanide series of the Periodic Table, as an anode in an electrolysis cell containing an acid aqueous metal containing electrolyte and a cathode, connecting the said anode and cathode with a source of electrolysis current, passing current through the electrolyte and recovering electrolysis products from said cell.
Claim 17
Independent Claim
88 words
The method of electrolysis which comprises using a surface oxidized alloy of titanium and 1 to 50% by weight of at least one member of the group consisting of metals from Groups VIB, VII, VIII, IIB, IB, IVA and lanthanum and lanthanide series of the Periodic Table, as an anode in an electrolysis cell containing an acid aqueous metal containing electrolyte and a cathode, connecting the said anode and cathode with a source of electrolysis current, passing current through the electrolyte and recovering electrolysis products from said cell.
References Cited (Backward Citations)
US2337475A
Cited
US3745101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |