Treatment of cell anodes
AssigneeERCO Industries Limited
InventorNorman W. Meyers
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Abstract
An electrode having a conductive platinum alloy coating and which has deteriorated in use in an electrolytic chlorate cell is heat treated at elevated temperatures of above 300.degree. C to regenerate the coating. The regeneration of the coating is exhibited by a decreased oxygen concentration in the cell off gases after the heat treatment. Further improvement in cell characteristics in severely deteriorated anodes may be achieved by coating the anode surface with a platinum group metal prior to or during the heat treatment.
Claims5
A method of treatment of an electrode having an anodic platinum-iridium alloy surface which has deteriorated in use in the electrolysis of sodium chloride solution to form sodium chlorate and gaseous by-products to the extent that a volume of oxygen of about 31/2 to 4% is present in said gaseous by-products, which comprises subjecting said electrode surface to an elevated temperature of from about 350.degree. to about 550.degree. C. for a time period of from about 5 minutes to about 5 days to provide an electrode having an improved platinum-iridium alloy surface which when used in said electrolysis results in a volume of oxygen of about 1 to 2% in said gaseous by-products.
Dependencies are inferred from the claim text.