Abstract
A processing technology was developed for alumina extraction from Al dross with the calcining-leaching process. The aluminum dross was mixed with soda and sintered at 1173K to yield soluble aluminates. Subsequently the sintered dross was leached with sulfuric acid to produce a solution containing aluminum. The unwanted metal ions, including Fe3+ and Na+, were removed by ethylene diamine tetraacetic acid (EDTA) and water washing. Then NH4HCO3, was added controlling the crystallization of NH4AlO(OH)HCO3, and the drying and calcining process was carried out, resulting in ultra fine Al2O3 powders with high purity. The characteristics of the Al2O3 powders were examined by means of XRD and SEM. The extraction efficiency of Al2O3 can surpass 98% by optimization of the calcination and lixiviation processes. Well-dispersed fibriform Al2O3 powders were obtained by calcining at 1000°C and the purity of the ultra fine Al2O3 powders was more than 99.36%.
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Qingsheng, L., Chunming, Z., Hui, F., Jilai, X. (2011). High Purity Alumina Powders Extracted from Aluminum Dross by the Calcining—Leaching Process. In: Lindsay, S.J. (eds) Light Metals 2011. Springer, Cham. https://doi.org/10.1007/978-3-319-48160-9_34
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DOI: https://doi.org/10.1007/978-3-319-48160-9_34
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48567-6
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