Abstract
Porang is the native plant and sources of glucomannan in Indonesia, but the utilization is limited. The presence of calcium oxalate in the porang tuber can cause to the health problem. The milling and air clarifying are the need to eliminate the impurities, i.e. calcium oxalate for producing pure porang flour. The aims of this present research were to know the effect of feed rate and inlet air velocity to reduce calcium oxalate on porang chips using micro mill assisted cyclone separator. This research divided to be 2 stages, the first stage was the determined the condition of feed rate and the inlet air velocity of the cyclone separator, and the second stage was to trial milling with the condition that obtained in the first stage. The result showed the range of feed rate of 45 – 55 kg/h and the inlet air velocity of 3 – 7 m/s. The feed rate and the inlet air velocity had a significant effect (p < 0.05) on the yield, the degree of whiteness, and calcium oxalate of porang flour. Overall, the best treatment was obtained at the feed rate of 50 kg/h and 7 m/s in the inlet air velocity of the cyclone separator.
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