Abstract
The synthesis of a Mg2+-Al3+-SO2−4-hydrotalcite-type compound from the acid wastewaters of the aluminum-anodizing industry has been studied as a possible means of recovering the unused Al resource materials as a useful mineral. The synthesis has been carried out from wastewaters of different concentrations (from 6.7 g Al/L to 134 mg Al/L) using the method of precipitation at constant pH, proving that all of them are suitable for such a process. The mineral was characterized using X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential thermal analysis and chemical analysis, all of which indicated characteristics typical of the desired compound. Almost 100% of the Al initially present in the wastewater solutions is recovered in the form of the Mg2+-Al3+-SO 2−4 -hydrotalcite-type compound.
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Álvarez-Ayuso, E., Nugteren, H.W. Synthesis of a Mg2+-Al3+-SO 2−4 -Hydrotalcite-Type Compound from the acid Wastewaters of the Aluminum-Anodizing Industry. Clays Clay Miner. 53, 11–17 (2005). https://doi.org/10.1346/CCMN.2005.0530102
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DOI: https://doi.org/10.1346/CCMN.2005.0530102