Characterization and Leaching of Coal Fly Ash |
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| Institution: | 1. College of Life Sciences and Engineering, Foshan University, Foshan 528225, Guangdong Province, PR China;2. Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, Jilin province, PR China;1. Biomolecular Physics Department, Babeș-Bolyai University, Kogălniceanu 1, 400084 Cluj-Napoca, Romania;2. Physics of Nanostructured Systems Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Donat 67-103, 400293 Cluj-Napoca, Romania;3. RDI Laboratory of Applied Raman Spectroscopy, RDI Institute of Applied Natural Sciences (IRDI-ANS), Babeş-Bolyai University, Fântânele 42, 400293 Cluj-Napoca, Romania;4. Department for Aquaculture, University of Dubrovnik, Ćira Carića 4, 20 000 Dubrovnik, Croatia;5. Electron Microscopy Centre, Babeș-Bolyai University, Clinicilor 5-7, 400006 Cluj-Napoca, Romania;6. Advanced Research and Technology Center for Alternative Energy, National Institute for Research and Development of Isotopic and Molecular Technologies, Donat 67-103, 400293 Cluj-Napoca, Romania;7. Department of Geology, Babeş-Bolyai University, Kogălniceanu 1, 400084 Cluj-Napoca, Romania;1. Department of Biology, Faculty of Sciences of the University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal;2. Laboratory of Water, Energy and Environment (3E), National School of Engineering of Sfax, University of Sfax, Route de Soukra Km 3.5, PO Box 1173, 3038 Sfax, Tunisia;3. CIIMAR - Interdisciplinary Centre of Marine & Environmental Research, Rua dos Bragas, n. 289, 4050-123 Porto, Portugal;4. Department of Chemical Engineering & CIEPQPF & University of Coimbra, 3030-290 Coimbra, Portugal;5. Department of Chemistry & CESAM, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;1. State Research Institute Center for Physical Sciences and Technology Public Institution, Savanorių ave. 231, LT-02300, Vilnius, Lithuania;2. Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko st. 24, 03225, Vilnius, Lithuania;3. Lithuanian Energy Institute Public institution, Breslaujos st. 3, LT-44403, Kaunas, Lithuania |
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| Abstract: | Physical characteristics, chemical composition and leaching behaviour of a waste fly ash from a coal-fired power station are reported. Particle size distribution was studied by the following techniques: sedimentation in a liquid medium; sedimentation in an air flow; and Fraunhofer diffraction of a laser beam. Results obtained by the different methods are in good agreement. Mineralogical content and chemical composition were determined by X-ray diffraction, electronic microprobe and X-ray fluorescence. Acid leaching of the samples was investigated, using the following strong acids in sequence: HCl+ HNO3, H2F2, HClO4. Analysis of leachates by atomic absorption shows trace metals In, Tl, Ge, Cu, Ga, Pb, Ni, Co, Mn, Cd, Zn, Cr.In this work fly ashes from a Spanish power plant are characterized according to the type of particles, size distribution and chemical composition by means of physical methods. Three particle size fractions are leached by acids and analysis of trace elements in the leaching liquor is carried out. The concentration of trace metals is somewhat higher in the particles of smallest size. |
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