Recycling of tailings from the Barruecopardo tungsten deposit for the production of glass

Alfonso, Pura; Castro, David; Garcı́a-Vallés, Maite; Tarragó, Mariona; Tomasa, Oriol; Martı́nez, Salvador

doi:10.1007/s10973-016-5332-y

Cited by 18 publications

(9 citation statements)

References 19 publications

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“…The Pb content in the G90-10 glass was 4437 ppm, from this, 0.230 ppm was removed during the leaching test, which represents 0.0005 wt.% of the total amount of Pb in this glass (Table 6). These results indicate the high stability of the toxic elements in the glassy structure, as has been reported in other glasses made from tailings [13,19,51] and in industrial waste products [53]. The refractive index, n, of both glasses produced was 1.54, which is similar than that of typical soda-lime-silica commercial glasses, with an n of 1.51 to 1.52, and slightly higher than in vitreous glasses because cations fill the interstices in the network [45].…”

Section: Leaching Behavioursupporting

confidence: 85%

“…Hue values of the Osor glasses were 93.18 and 110.32 • ; values between 90 and 180 • indicate yellow-green tonality. In Figure 9, these parameters are shown together with others obtained from glasses produced using tailings from different origins, whose characteristics were previously published [13,19,51]. Comparison of the colour parameters from these glasses indicates that tailing glasses usually show medium or dark colour and a low purity.…”

Section: Optical Propertiesmentioning

confidence: 74%

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

et al. 2020

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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.

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Section: Leaching Behavioursupporting

confidence: 85%

Section: Optical Propertiesmentioning

confidence: 74%

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

et al. 2020

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“…Materials used for this study came from tailings of the most common types of tungsten deposits. Tailings of granitic composition from Barruecopardo (Spain) were previously investigated [7] and here they are compared with wastes from the tailing of veins hosted in schists from Panasqueira (Portugal) and calc-silicate materials from the skarn-type deposit of Morille (Spain).…”

Section: Methodsmentioning

confidence: 99%

Potential of tungsten tailings as glass raw materials

et al. 2018

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Glasses from different types of tungsten mine tailings were obtained and studied to determine their ability to be used as raw materials of commercial glass. Tailings of granitic composition from Barruecopardo, of calc-silicate wastes from Morille, and of schists and quartz from Panasqueira, were used as raw materials. The addition of CaCO3 and NaCO3 was necessary for the manufacture of the glass. Samples were characterised by XRF, XRD, HSM and DTA-TG. Furthermore, the expansion coefficient, Vickers microhardness and leaching properties were measured. The results show that all the tungsten mine tailings used were suitable for the manufacture of commercial glass, with the addition of calcium and soda. The calc-silicate tailing needs less additive content to produce a glass. Also, they present lower workability temperatures and higher durability. Glasses obtained from all the tested tailings retain the potentially toxic elements in their structure and prevents the environmental pollution.

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“…Other interesting properties of glass-ceramics regarding their stability are the lack of porosity and high strength and toughness [18]. Ca-rich wastes are good candidates for vitrification and subsequent glass-ceramic processing -in products such as Sital slag from the steel and copper industries of Russia [20], cupola slag blast [21], blast furnace slag [22], tin tailings [23], molybdenum tailings [24], and tungsten tailings [25,26].…”

Section: Basalt Uss Compositionsmentioning

confidence: 99%

“…55 Ca-rich wastes are good candidates for vitrification and subsequent glass-ceramic processing as seen in products such as Sital slag, 56 cupola slag blast, 57 blast furnace slag, 58 tin tailings, 59 molybdenum tailings, 60 and tungsten tailings. 61,62 The objective of this study is to simulate the vitrification of a sewage sludge and basalt mixture using Ca-enriched basalts. We describe the glass-forming range, structure, thermal behavior, and crystallization and present the effect of chemical composition in microhardness and chemical durability.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of calcium in glasses: A key to understand the vitrification of sewage sludge

Tarragó

Royo

Garcı́a-Vallés

2021

Int J of Appl Glass Sci

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The quantity of sewage sludge generated daily by wastewater treatment plants represents a major environmental problem and a financial burden for plant operators.Valorization strategies focusing on reusing sewage sludge as a raw material are currently developed. Vitrification can help us reduce the volume of waste and binds the components in the structure of chemically stable glasses and glass-ceramics. In this study, the vitrification of sewage sludge inside a basaltic rock has been simulated by producing glasses and a glass-ceramic from basalt enriched in calcium that lie between the stability fields of pyroxene and melilite in the system CaO-MgO-SiO 2 -Al 2 O 3 . CaO addition causes the oxidation of the melt at above the liquidus, increases the crystallization temperature, decreases the melting temperature, and improves the microhardness of the glasses. Glass-ceramic processes improves the properties of the Ca-doped basalt glass. The microhardness of the glass (8.2 GPa) and the glassceramic (8.6 GPa) and leaching tests (in the ppb range) place both the glass and the glass-ceramics at the high end of the mechanical properties and chemical resistance of ceramic tiles for the building industry.

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Recycling of tailings from the Barruecopardo tungsten deposit for the production of glass

Abstract: Peer ReviewedPostprint (author's final draft

Cited by 18 publications

References 19 publications

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

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

Potential of tungsten tailings as glass raw materials

Incorporation of calcium in glasses: A key to understand the vitrification of sewage sludge

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