The Effects of Coating Speed and Substrate on Catalytic Titanium Anodes
In recent years with increasing concerns about energy consumption in hydrometallurgical processing, there is an ongoing attempt to use Catalytic Titanium Anodes (CTAs) for copper electrowinning. For this work, anodes with IrO2 - Ta2O5 coatings were prepared in the laboratory with the same total coating loading but varying the number of layers by changing the speed of withdrawal in dip coating. A second set of CTAs were fabricated on niobium, Ti Grade 1, Ti Grade 7 and Ti Grade 36 metal substrates. All the anodes prepared in the laboratory were characterized using standard electrochemical techniques and subjected to accelerated life testing. It was found that the coating would not adhere to the niobium substrate, the grade of titanium had a minimal to no effect on the life of the anode, and it is observed that as the coating speed slows, there is an increase in the electrochemically active surface area of the coating which seems to directly contribute to an increase in the Tafel slope of the anodes. There was inconclusive evidence on the effect of coating speed on anode lifetime.
P. Bagri and M. S. Moats, "The Effects of Coating Speed and Substrate on Catalytic Titanium Anodes," Proceedings of the 28th International Mineral Processing Congress (2016, Quebec City, Canada), Canadian Institute of Mining, Metallurgy and Petroleum, Sep 2016.
28th International Mineral Processing Congress, IMPC 2016 (2016: Sep. 11-16, Quebec City, Canada)
Materials Science and Engineering
Keywords and Phrases
Anode Corrosion; Copper Electrowinning; Hydrometallurgy; Inert Anodes; Iridium; Tantalum
International Standard Book Number (ISBN)
Article - Conference proceedings
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01 Sep 2016