Metallurgical use of glass fractions from waste electric and electronic equipment (WEEE) |
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| Authors: | Sina Mostaghel Caisa Samuelsson |
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| Institution: | 1. Department of Materials Science and Engineering, Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Ghent, Belgium;2. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 (box 2450), B-3001 Leuven, Belgium;1. Swinburne University of Technology, Australia;2. Wealth from Waste Research Cluster, Australia;3. Helmholtz Institute Freiberg for Resource Technology, Germany;1. Department of Mechanical Engineering, IIMT College of Engineering, Greater Noida, U.P-201310, India;2. Department of Mechanical Engineering, Rama University, Kanpur-,U.P.-208002, India;3. Departmnt of Mechanical Engineering Manav Rachna University, Faridabad, Haryana, India;4. Department of Mechanical Engineering, Gautam Buddha University, Greater Noida,U.P-201310, India;1. School of civil and resource engineering, University of Science & Technology Beijing, Beijing 100083, China;2. School of energy and environmental engineering, University of Science & Technology Beijing, Beijing 100083, China;3. School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China;4. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University,Yinchuan 750021, China;5. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xian 710000, China |
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| Abstract: | Within the European Union, it is estimated that between 8 and 9 million tonnes of waste electric and electronic equipment (WEEE) arises annually, of which television sets and computers account for an important part. Traditionally, Cathode Ray Tubes (CRT) have been used for TVs and computer monitors, but are rapidly being replaced by flat-screen technology. Only part of the discarded CRT glass is being recycled. Primary smelters use large amounts of silica flux to form iron-silicate slag, and can, in most cases, tolerate lead input. Use of discarded CRT glass in copper smelting is a potential alternative for utilization of the glass.The mineralogical composition of a slag sampled during ordinary slag praxis has been compared with that of a mixture of slag and CRT glass when re-melted and slowly cooled. Slag (iron-silicate slag) from Boliden Mineral AB, Sweden, was used for the experiments. Slag and glass have been mixed in various proportions: pure slag, pure glass, 90% slag-10% glass and 65% slag-35% glass, and heated in an inert atmosphere up to 1400 °C in a Netzsch Thermal Analysis (TA) instrument. The re-melted material has been analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to determine changes in mineralogical composition after mixing with glass.The results show that the main mineralogical component of the slag is fayalite; the CRT glass is amorphous. The main crystalline phases of the slag do not change with addition of glass. An amorphous phase appears when the addition of glass is increased, which gives the sample a different structure. |
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