By Keith Neyrey, Les Edwards, and James Marino.
The ISO Coke Air Reactivity test has been used by the smelting
industry for many years but its use as a calcined coke
specification is decreasing. This paper presents a review of
previous work published on this test and presents experimental
data on a wide range of cokes currently being used for anode
production. Coke air reactivities are strongly dependent on coke
calcination levels and it is possible to drive air reactivities lower
by increasing calcining temperatures. With the general increase in
sulfur level of high sulfur cokes used in anode coke blends, higher
calcining levels are not desirable due to their negative influence
on coke porosity as a result of thermal desulfurization. Many
smelters are now adopting lower real density specifications, which
runs counter to achieving the low coke air reactivities required to
meet coke air reactivity specifications.
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