Phosphorus solubility in basaltic glass: Limitations for phosphorus immobilization in glass and glass-ceramics

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:220

Article

Tarrago, M.^1,2  Garcia-Valles, M.¹  Martinez, S.¹  Neuville, D. R.² 

[1] Univ Barcelona, Fac Ciencies Terra, Dept Mineral Petrol & Geol Aplicada, C Marti & Franques S-N, E-08028 Barcelona, Spain

[2] USPC, CNRS, Inst Phys Globe Paris, 1 Rue Jussieu, F-75005 Paris, France

关键词: Vitrification;    Immiscibility;    Viscosity;    Crystallization;    Leaching;    Valorization;    Phosphorus;   

DOI  :  10.1016/j.jenvman.2018.04.079

来源: Elsevier

【 摘 要 】

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. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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