Claims
- 1. An electrolytic process utilizing an electrolytic cell having at least one gas-evolving anode, at least one cathode, and an electrolyte solution in contact with said anode and cathode and comprising an acid, a metal ion source and a solvent, said process comprising applying an electrical potential between said anode and said cathode to induce current flow wherein said electrolyte solution contains at least one organic additive in an amount sufficient to reduce cell operating potential at constant current, compared to the same process without such organic additive, said organic additive being selected from the group consisting of:
- 3. The process of claim 2 wherein the organic additive is 4,6-dihydroxypyrimidine
- 4. The electrolytic process of claim 1 which is copper electrowinning, zinc electrowinning, manganese electrowinning, copper foil production or electrogalvanizing.
- 5. The electrolytic process of claim 1 in which the anode is comprised of lead or a lead alloy.
- 6. The process of claim 1 in which the metal ion source is a metal salt.
- 7. The process of claim 6 in which the metal salt is selected from the group consisting of copper sulfate, zinc sulfate, manganese sulfate, and nickel sulfate.
- 8. The process of claim 1 wherein said solvent comprises water and a polar organic solvent.
- 9. An electrolytic process utilizing an electrolytic cell having at least one gas-evolving anode, at least one cathode, and an electrolyte solution in contact with said anode and cathode and comprising an acid, a metal ion source and a solvent said process comprising applying an electrical potential between said anode and said cathode to induce current flow wherein said electrolyte solution contains at least one organic additive in an amount sufficient to reduce gas evolution at the anode, compared to the same process without such organic additive, said organic additive being selected from the group consisting of: organic compounds soluble in the electrolyte solution which have at least one hydroxy group, excluding ethylene glycol, ethanol, and dextrin;
- 12. The electrolytic process of claim 9 wherein the process is copper electrowinning, zinc electrowinning, manganese electrowinning, copper foil production, or electrogalvanizing.
- 13. The process of claim 9 in which the anode is comprised of a material selected from the group consisting of lead and lead alloys.
- 14. The process of claim 9 in which the metal ion source is a metal salt.
- 15. The process of claim 14 in which the metal salt is selected from the group consisting of copper sulfate, zinc sulfate, manganese sulfate, and nickel sulfate.
- 16. The process of claim 9 wherein the metal ion source is chromic acid.
- 17. The process of claim 9 in which the solvent comprises water and a polar organic solvent.
- 18. A solid composition comprising copper and at least one organic additive selected from the group consisting of organic compounds soluble in the electrolyte solution which have at least one hydroxy group, excluding ethylene glycol, ethanol, and dextrin;
- 19. The composition of claim 18 wherein the organic additive is selected from the group consisting of:
- 20. An electrolytic process utilizing an electrolytic cell having at least one anode, at least one cathode, and an electrolyte solution in contact with said anode and cathode and comprising an acid, a metal ion source and a solvent, and having a substantial absence of cobalt in the electrolyte solution, said process comprising applying an electrical potential between said anode and said cathode to induce current flow wherein said electrolyte solution contains at least one organic additive in an amount sufficient to reduce gas evolution at the anode, compared to the same process without such organic additive, said organic additive being selected from the group consisting of: organic compounds soluble in the electrolyte solution which have at least one hydroxy group;
- 21. A copper electrowinning process utilizing an electrolytic cell having at least one gas-evolving anode, at least one cathode, and an electrolyte solution in contact with said anode and cathode and comprising an acid, a copper ion source and a solvent said process comprising applying an electrical potential between said anode and said cathode to induce current flow wherein said electrolyte solution contains at least one organic additive in an amount sufficient to increase the rate of copper deposition on the cathode at constant voltage, compared to the same process without such organic additive, said organic additive being selected from the group consisting of:
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to U.S. Provisional Patent Application No. 60/307,560, filed Jul. 24, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60307560 |
Jul 2001 |
US |