PRODUCTION OF ALUMINUM OXIDE FROM ALUMINUM-CONTAINING INDUSTRIAL WASTE BY ALKALINE LEACHING
DOI:
https://doi.org/10.66960/jof.3093-8899.00029Keywords:
aluminum, RKA-02, alkaline leaching, calcination, selective extraction, industrial wasteAbstract
In this study, an efficient technology for the selective extraction of aluminum and the production of high-purity aluminum oxide Al₂O₃ was developed using an aluminum-rich industrial waste sample, RKA-02. According to the results of X-ray fluorescence (XRF) analysis, aluminum was identified as the major component of the sample, with an oxide-form content of 68.0 wt.%. The waste was also found to contain a significant amount of potassium (K₂O ≈ 30.4 wt.%), along with minor quantities of iron, zinc, nickel, and other metallic impurities. A hydrometallurgical approach based on alkaline leaching was employed in this study. Experimental results demonstrated that leaching in a 4 M NaOH solution at 90°C for 3 hours provided the maximum dissolution of aluminum into the solution in the form of sodium aluminate. In the preliminary stage, water washing effectively removed potassium salts and improved the overall process efficiency. During the purification stage, silicates were successfully removed using Ca(OH)₂, while heavy metal ions were precipitated with Na₂S. Aluminum was recovered from the solution by carbonation and precipitated as Al(OH)₃ within a pH range of 8.5–9.0. Subsequent drying and calcination of the obtained hydroxide at 1000°C resulted in the formation of high-purity Al₂O₃. The proposed method is characterized by high selectivity, technological simplicity, and process efficiency, making it a promising approach for the recycling and utilization of aluminum-containing industrial wastes.
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Copyright © 2026 Abdulla Dadaxodjayev, Shoxista Gayimova, Murod Eshmurodov
This work is licensed under a Creative Commons Attribution 4.0 International License.
This work is licensed under a Creative Commons Attribution 4.0 International License.
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