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Phosphorus solubility in basaltic glass: limitations for phosphorus immobilization in glass and glass-ceramics
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The composition of sewage sludge from urban wastewater treatment plants is simulated using P-doped basalts. Electron microscopy analyses show that the solubility of P in the basaltic melt is limited by the formation of a liquid-liquid immiscibility in the form of an aluminosilicate phase and a Ca-Mg-Fe-rich phosphate phase. The rheological behavior of these compositions is influenced by both phase separation and nanocrystallization. Upon a thermal treatment, the glasses will crystallize into a mixture of inosilicates and spinel-like phases at low P contents and into Ca-Mg-Fe phosphate at high P contents. Hardness measurements yield values between 5.41 and 7.66 GPa, inside the range of commercial glasses and glass-ceramics. Leaching affects mainly unstable Mg2+-PO43- complexes.
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TARRAGÓ AYMERICH, Mariona, et al. Phosphorus solubility in basaltic glass: limitations for phosphorus immobilization in glass and glass-ceramics. Journal of Environmental Management. 2018. Vol. 220, num. 54-64. ISSN 0301-4797. [consulted: 5 of August of 2026]. Available at: https://hdl.handle.net/2445/207303