“Evolution of Anode Coke Quality”

Light Metals, 2012, 1207-1212

By Les Edwards, N. Backhouse, H. Darmstadt, and Marie-Josie Dion.

The petroleum refining industry has historically categorized
petroleum cokes as fuel, anode, or needle grade cokes. The term
“anode grade coke” has been used as a broad definition by the
aluminum industry to describe delayed coke with a sponge
structure containing relatively low levels of metals like vanadium
(typically <400ppm) and low to moderate levels of sulfur (0.5-
4.0%). These classifications are less relevant today due to the
much wider range of cokes used in anode blends. This paper will
present a review of the growing range of coke qualities used in
anode blends. Shortages of traditional quality anode coke are
driving calciners and anode producers to use cokes with a much
wider range of properties. Cokes previously regarded as
unsuitable for anode production are being used routinely in blends
at varying levels and this trend will continue. Examples are given
on how smelters are dealing with changing coke quality.

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