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INTERFERENCE EFFECTS OF IMPURITIES ON THE CRITICAL OXALATE CONCENTRATION

A. PATRO, B. K SATAPATHY AND A.K PANIGRAHI

Impurities in the sodium aluminate liquor are mainly dependant, on factors like bauxite quality and the technology -adopted for making alumina. Effects of impurities on the quality of product, although known in general vary from plant to plant depending on the process parameters maintained and bauxite quality charged. Out of different impurities, oxalic carbon is the most dangerous one which is detrimental to product quality and yield. In the present investigation efforts have been made to study the interference effects of mineral carbonate, organic and oxalic carbon on the critical oxalate concentration of sodium aluminate liquor with respect to temperature, concentration and alumina to Icaustic ratio. Effect of lime on these impurities is also highlighted in the paper as a step for maintaining higher liquor causticity.