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process for extraction of alumina by conversion of the tonerdegehaltes of alumina and kieselsaeure containing substance in loesliches alkalialuminat and kieselsaeuregehaltes in unloesliches calciumsilikat
process for extraction of alumina by conversion of the tonerdegehaltes of alumina and kieselsaeure containing substance in loesliches alkalialuminat and kieselsaeuregehaltes in unloesliches calciumsilikat