Assessment of Bauxite Residue for Reclamation Purposes After Calcification–Carbonization Treatment
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To develop a more benign materials production route and encourage reuse of bauxite residue produced in the Bayer process, this study aimed to recover the alkali and alumina fractions from bauxite residue by using a novel calcification–carbonization (C–C) method. The obtained dealkalized and dealuminized residue (C–C residue) was then remediated for reclamation to consume all secondary tailings. The C–C process greatly reduced the salinity and alkalinity of the bauxite residue by extracting up to 80% of the alkali and over 40% of the alumina. The Na content in the leachate decreased significantly from 1340 mg/L in the bauxite residue to 0.26 mg/L in the C–C residue. To evaluate the environmental effects of the newly produced residue, the original bauxite residue and the C–C residue were regarded as soil samples for direct comparison with a natural soil and a nutritional soil for remediation purposes.
This work was financially supported by the National Natural Science Foundation of China (Nos. 51874078, U1710257, and U1202274), State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources (YY2016006), Shenyang Science and Technology Project (17-500-8-01, Z18-5-022), and Fundamental Research Funds for the Central Universities of China (Grant No. N162506003).
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