Effects of anthracite calcination and formulation variables on properties of bench scale aluminum smelting cell cathodes |
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Authors: | David Belitskus |
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Affiliation: | (1) Physical Chemistry Division, Alcoa Laboratories, 15069 Alcoa Center, PA |
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Abstract: | Several anthracites were calcined at temperatures ranging from about 1100 to 2300°C and bench scale cathodes fabricated, baked,
and tested for electrical resistivity and expansion during electrolysis. Cathode electrical resistivity did not decrease much
with increasing anthracite calcination temperature to about 1800°C but decreased sharply there-after. Cathode expansion during
electrolysis was inversely proportional to anthracite calcination temperature to about 2000°C. Electrical resistivity generally
decreased during test cell operation. A correlation between anthracite properties and cathode properties for anthracites calcined
at 2100°C could not be made. With a commercial electrically calcined anthracite, the finer of two aggregate sizings resulted
in cathodes with superior properties, and properties generally optimized at a binder level producing about a zero volume change
during baking. |
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