INALUM used to mix high sulfur and low sulfur coke with 60:40 in ratio since 2004. INALUM made some efforts to increase anode quality, such as Blaine number stabilization, butt cleaning improvement, cone crusher utilization. By controlling fine fractions output in green paste mixing, the Blaine number variance reduced by 5%. Butt quality also become a big factor to the anode quality, by perform better butt cleaning process to reduce the impurities. The impurity is reduced and steady in level below 150 ppm from specification 300 ppm. In green paste mixing, coarse material also influence the green paste product. In butt crushing, coarse material composition shall reach 5%, that existing hammer mill cannot provide. INALUM install cone crusher to increase coarse material up to 10%. By perform those improvements, increase RRO2 by 2.5% and RRCO2 0.74%.