Abstract
A high proportion of high‑magnesium boron tailings are ignored or abandoned during the production of boron chemical products. If the tailings are treated with existing CO2-soda ash or alkaline leaching methods, the activity will result in the wastage of magnesium resources and stockpile of residues. The present study proposes an innovative approach to balancing the efficient leaching of main elements and a sustainable use of residues. Central composite design was employed to confirm that leaching temperature and time had a significant effect on the release of boron and magnesium. The results showed that the thermodynamic reactivity of brucite in the tailing was the highest, while that of magnesite was the lowest. The formation of sulfate solid-product layer hindered the release of magnesium and increased the apparent activation energy of chemical reactions. After leaching, the relative integrity of SiO4 tetrahedral sheets in Mg-silicate phase was a prerequisite for mesoporous residue. This leach residue was proven to have significant adsorption effect on methylene blue, which make it suitable as an adsorption material for removing wastewater pollutants.
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