Lead Containing Patents (Class 205/578)
  • Alloy and anode for use in the electrowinning of metals
    Patent number: 7704452
    Abstract: A lead calcium tin alloy to which cobalt has been added is described. The alloy is useful in the formation of anodes to be used in electrowinning cells. Electrowinning cells containing the cobalt alloys are particularly suited for electrowinning metals, such as copper, from sulfuric acid electrolytes. The cobalt-containing anodes improve the efficiency of oxygen evolution at the anode during electrowinning and reduce corrosion of the anode.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: April 27, 2010
    Assignee: RSR Technologies, Inc.
    Inventors: David R. Prengaman, Andreas Siegmund
  • Electrolytic processes with reduced cell voltage and gas formation
    Patent number: 7384533
    Abstract: Electrolytic solutions containing organic additive(s) selected from a described class of additives (e.g., 4,6-dihydroxypyrimidine) reduce overall applied electrical potential of electrolytic cells and/or reduce gas formation at the anode(s) or increase copper production rate. Benefits include reducing overall power consumption and reducing acid mist during electrolytic processes.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: June 10, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Michael J. Sierakowski, L. Charles Hardy, Michael S. Terrazas, Jennifer E. Waddell, Bryan J. Johnson
  • Copper electrowinning
    Patent number: 6368489
    Abstract: There is disclosed a method for copper electrowinning and a modified lead electrode for use in such method. The modified electrode is suitable for use as an oxygen anode in low current density, oxygen-evolving applications.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: April 9, 2002
    Assignee: Eltech Systems Corporation
    Inventors: Kenneth L. Hardee, Lynne M. Ernes, Carl W. Brown, Jr.