By Chuck Coney, Lew Crabtree, John Gavin, Wes Marcrum, Andrea Weber, and Les Edwards.
In early 2011, the Rio Tinto – Sebree Works smelter experienced a
significant increase (~100ppm) in calcined coke vanadium to
levels around 410-440ppm. This was driven by crude oil changes
at a refinery supplying one of the primary cokes used in the coke
blend supplied to the smelter. The paper discusses the impact of
the change on anode quality and carbon consumption and some of
the actions taken by the smelter to respond to the change. Data is
presented showing the impact on process metrics such as anode
consumption, unscheduled anode changes, current efficiency,
power consumption, and primary metal quality. The paper shows
that changes of this magnitude can be managed with an
appropriate understanding of key performance drivers and a
focused technical improvement plan.
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