PHYSICO-CHEMICAL CHARACTERIZATION AND LEACHING OF DESULPHURIZATION COAL FLY ASH |
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| Institution: | 1. Département Environnement, Electricité de France, Direction des Etudes et Recherches, 6 Quai Watier, 78400 Chatou, France;2. Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris XII, Val de Marne, URA CNRS 1404, 61 Av. du Général de Gaulle, 94010 Creteil Cédex, France;1. University of Chemistry and Technology Prague, Department of Analytical Chemistry, Technická 5, 166 28 Prague 6, Czech Republic;2. Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10/112, 162 00 Prague 6, Czech Republic;3. University of Pardubice, Department of Biological and Biochemical Sciences, Studentská 95 532 10 Pardubice, Czech Republic;1. Department of Gamete and Embryo Biology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences in Olsztyn, Olsztyn, Poland;2. Department of Lake and River Fisheries, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland;1. Palacky University of Olomouc, Department of Geology, 17. listopadu 12, 771 46 Olomouc, Czech Republic;2. CEITEC IPM, Institute of Physics of Materials, v.v.i., Academy of Sciences of the Czech Republic, Zizkova 22, 616 62 Brno, Czech Republic;1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;2. State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China;1. Institute of Physics, University of Tartu, Ravila 14c, 50411 Tartu, Estonia;2. A.I. Alikhanyan National Science Laboratory, 2 Br. Alikhanyan Str., 0036 Yerevan, Armenia;1. Department of Chemistry, Dalian University of Technology, Dalian 116024, China;2. Department of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China |
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| Abstract: | Fly ash produced by coal combustion using two types of desulphurization process were studied: a conventional pulverized coal boiler equipped with lime injection (PCL ash), and a circulating fluidized bed combustion boiler with limestone injection (CFBC ash). The ashes were characterized completely: granulometry, morphology, mineralogy, chemical composition and behaviour to water contact. Both PCL ash and CFBC ash present similar features: fine granulometry, presence of anhydrite phase and sulphate content. However, PCL ash also shows lots of spherical particles, unlike CFBC ash, and a much higher lime content, due to the lower desulphurization rate in PC boilers. Unlike CFBC ash, most of the trace elements in PCL ash show an inverse concentration–particle size dependence. Leachates obtained from both samples are rich in soluble salts CaSO4and Ca(OH)2] and arsenic and selenium are prevented from solubilizing by high lime content. In wetted PCL ash, the formation of ettringite crystals stabilizes calcium and sulphate ions. Simultaneously, arsenate, selenate and chromate anions are trapped in the crystal. CFBC ash does not really harden because the lime content is too low. However, the leached selenium concentration is cut down in wetted CFBC ash samples. |
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