Abstract
Mineral acids, such as H 3PO 4, H 2SO 4, HCl, and HNO 3, were treated with magnesium–aluminum oxide (Mg–Al oxide), which behaved as a neutralizer and fixative of anions. Anion removal increased with increasing Mg–Al oxide quantity, time, Mg/Al molar ratio, and initial acid concentration. Up to 95% removal of anions was achieved in 0.5 N acids using a stoichiometric quantity of Mg 0.80Al 0.20O 1.10 for H 3PO 4, 1.75 stoichiometric quantities for H 2SO 4, or 2.5 stoichiometric quantities for HCl or HNO 3 at 20°C over a period of 6 h. The final solutions were found to have a pH in the range of 8–12. Selectivity of acid removal was found to follow the following order: H 3PO 4>H 2SO 4>HCl>HNO 3. The equivalent of acid removal per 1 g of Mg–Al oxide decreased as the Mg/Al molar ratio of Mg–Al oxide increased.
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