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- W2603048366 abstract "Currently, the aluminum industry is facing a major problem in the disposal of highly alkaline bauxite wastewater. It contains the red mud that is formed during alumina extraction via Bayer process. Approximately, 1.5 t/y of bauxite residue per ton of alumina were produced and continuously increasing up to 150 Mt/y. In this study, the simulated bauxite wastewater was treated using a non-seeded fluidized-bed homogeneous granulation technology. The effect of effluent pH, molar ratio of [Ca+2]in/[C2O4−2]in (1.00, 1.25, 1.50, and 1.75), and influent flow rates (15, 25, and 35 mL min−1) were evaluated in terms of oxalate removal and granulation efficiency. Increasing the pH of effluent tend to increase the oxalate removal and granulation efficiency. The best effluent pH with highest removal of 87.6% was 5.5 ± 0.05 and for the granulation of 81.7% was 3.75 ± 0.05. Increasing the molar ratio of [Ca+2]in/[C2O4−2]in up to 1.75 exhibits a reduction of oxalate concentration in the bauxite wastewater. This results to the highest oxalate removal of 87.6% and granulation efficiency of 85.6%. At 35 mL min−1 influent flow rate, the highest oxalate removal of 86.6% and 84.6% granulation efficiency was achieved. A firm and rigid structures of micro fragments of the granules formed was analyzed using SEM and validated by XRD analysis as calcium oxalate monohydrate (COM-CaC2O4·H2O)." @default.
- W2603048366 created "2017-04-07" @default.
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- W2603048366 date "2017-06-01" @default.
- W2603048366 modified "2023-10-13" @default.
- W2603048366 title "Recovery of oxalate from bauxite wastewater using fluidized-bed homogeneous granulation process" @default.
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- W2603048366 doi "https://doi.org/10.1016/j.jclepro.2017.03.172" @default.
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