Method for a metal electrowinning
AssigneePermelec Electrode Ltd.
InventorToshikazu Hayashida
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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.
Claims6
A method for a metal electrowinning comprising:
- precipitating a metal from a metal chloride solution in a bath provided with an anode for electrolysis,
- wherein said anode comprises a substrate comprising titanium or titanium alloy, and a coating comprising a plurality of unit layers, provided on a surface of the substrate,
- each of the unit layers comprises a first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide, and a second coating layer comprising a mixture of platinum and iridium oxide,
- the first coating layer of one of the unit layers formed on the surface of said substrate is in contact with the surface of said substrate,
- in each unit layer, the second coating layer is formed on the first coating layer and one of the second coating layers is formed as an outmost layer of the coating, and
- said coating is provided on the surface of the substrate by a thermal decomposition baking method, followed by post-baking at a baking temperature higher than that of the thermal decomposition baking method.
Dependencies are inferred from the claim text.