Abstract
The cost of low sulfur calcined petroleum coke (LS-CPC) is higher than that of high sulfur (HS-CPC). The trend of increasing CPC cost has been significant in recent years and has independent from metal prices. Since 2004, INALUM has tried to determine the proper blending formula between HS-CPC and LS-CPC to improve production costs, as well as anode performance without disturbing plant operation. INALUM has used various blending ratios for the two types of coke, i.e. 60/40, 85/15 as well as 100/0. The increased presence of sulfur does influence anode quality but through well-managed granulometry and recipe, anode quality is still maintained. By utilizing the 85/15 ratio in coke blending, INALUM has successfully reduced anode production costs by approximately 7%.KeywordsSulfurCalcined petroleum cokeDesulfurizationCoke blendingReactivityAir permeability
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