Method for a metal electrowinning
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United States of America Patent
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Dec 31, 2013
Grant Date -
May 10, 2012
app pub date -
Oct 14, 2011
filing date -
Nov 4, 2010
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Abstract
An electrowinning method of metals through electrolysis of a metal chloride solution uses an anode comprising a substrate comprising titanium or titanium alloy, and a coating layer comprising a plurality of a unit layer, provided on the surface of the substrate. The unit layer comprises the first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide and the second coating layer comprising a mixture of platinum and iridium oxide. The first coating layer contacts with the surface of said substrate and an outer coating layer of the unit layer formed on the outermost layer of said coating layer is the second coating layer. The coating layer is formed by thermal decomposition baking, which followed by post-baking at a higher baking temperature.
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