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SYNTHESIS OF A Mg²⁺-Al³⁺-SO₄^2–-HYDROTALCITE-TYPE COMPOUND FROM THE ACID WASTEWATERS OF THE ALUMINUM-ANODIZING INDUSTRY

Department of Chemical Technology, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2638 BL Delft, The Netherlands

^* E-mail address of corresponding author: e.alvarez{at}tnw.tudelft.nl

The synthesis of a Mg²⁺ -Al³⁺ -SO₄^2– -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⁺ -SO₄^2– -hydrotalcite-type compound.

Key Words: Aluminum • Anodizing • Hydrotalcite • Recovery • Wastewaters