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Article

The Use of Tailings to Make Glass as an Alternative for Sustainable Environmental Remediation: The Case of Osor, Catalonia, Spain

1
Departament d’Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya Barcelona Tech, Av. de les Bases de Manresa 61–63, 08242 Manresa, Spain
2
Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Carrer Martí i Franquès 1, 08028 Barcelona, Spain
3
Departament de Mecànica de Fluids, Universitat Politècnica de Catalunya Barcelona Tech, Carrer Colom 11, 08222 Terrassa, Spain
4
Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona, Av. Diagonal 343, 08028 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(9), 819; https://doi.org/10.3390/min10090819
Received: 17 August 2020 / Revised: 10 September 2020 / Accepted: 14 September 2020 / Published: 16 September 2020
(This article belongs to the Special Issue Industrial Minerals)
Tailings from the Osor fluorite mines release large amounts of potentially toxic elements into the environment. This work is a proposal to remove these waste materials and use them as a raw material in the manufacture of glass. The chemical composition of the tailings was determined by X-ray fluorescence and the mineralogy by X-ray diffraction. Waste materials have SiO2, Al2O3 and CaO contents suitable for a glass production, but Na as NaCO3 has to be added. Two glass formulations, with 80–90% of the residue and 10–20% Na2CO3, have been produced. The crystallization temperatures, obtained by differential thermal analysis, were 875 and 901 °C, and the melting temperatures were 1220 and 1215 °C for the G80-20 and G90-10 glasses, respectively. The transition temperatures of glass were 637 and 628 °C. The crystalline phases formed in the thermal treatment to produce devitrification were nepheline, plagioclase and diopside in the G80-20 glass, and plagioclase and akermanite-gehlenite in the G90-10 glass. The temperatures for the fixed viscosity points, the working temperatures and the coefficient of expansion were obtained. The chemical stability of the glass was tested and results indicate that the potentially toxic elements of the tailings were incorporated into the glass structure. View Full-Text
Keywords: recycling; tailings; glass; workability recycling; tailings; glass; workability
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MDPI and ACS Style

Alfonso, P.; Tomasa, O.; Domenech, L.M.; Garcia-Valles, M.; Martinez, S.; Roca, N. The Use of Tailings to Make Glass as an Alternative for Sustainable Environmental Remediation: The Case of Osor, Catalonia, Spain. Minerals 2020, 10, 819. https://doi.org/10.3390/min10090819

AMA Style

Alfonso P, Tomasa O, Domenech LM, Garcia-Valles M, Martinez S, Roca N. The Use of Tailings to Make Glass as an Alternative for Sustainable Environmental Remediation: The Case of Osor, Catalonia, Spain. Minerals. 2020; 10(9):819. https://doi.org/10.3390/min10090819

Chicago/Turabian Style

Alfonso, Pura, Oriol Tomasa, Luis M. Domenech, Maite Garcia-Valles, Salvador Martinez, and Núria Roca. 2020. "The Use of Tailings to Make Glass as an Alternative for Sustainable Environmental Remediation: The Case of Osor, Catalonia, Spain" Minerals 10, no. 9: 819. https://doi.org/10.3390/min10090819

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