In many silo systems for the aluminium industry little emphasis was laid on the way the alumina was fed into the silos. Simply one point of entry at center of top of silo was widely used. As the powder drops to the top of the alumina level inside the silo the powder segregates with effects when discharged into downstream systems such as dry scrubbers, alumina transport and pot feeding systems. Sampling of alumina discharged from an enriched alumina silo at the Elkem Mosjoen smelter demonstrated systematic large differences in the fines fraction being fed the pots. Typically, one pot room received twice as much fine as the other. An anti-segregation system was integrated in the silo with a challenge on restricted heights and space. Immediately after connecting up the anti-segregation system sampling of the two alumina discharge spouts consistently demonstrated a homogenous alumina with equal fractions of fines and fluoride content.
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