The chemical and mineralogical composition of the water-soluble fraction of power-plant ash and its effect on the process of crystallization of water |
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| Institution: | 1. Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 8, CZ-12840 Prague 2, Czech Republic;2. Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, CZ-12840 Prague 2, Czech Republic;3. Centre of polymer systems, University Institute, Tomas Bata University in Zlin, Zlín, Czech Republic;1. CSIR – National Metallurgical Laboratory, Jamshedpur 831007, India;2. Coal Geology and Organic Petrology Laboratory, Department of Applied Geology, Indian School of Mines, Dhanbad 826004, India |
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| Abstract: | The content of the water-soluble fraction of power-plant fly ash from nine power plants burning brown and black coal varied in the range 0.43–1.34%. It was found, on the basis of chemical analysis and X-ray diffraction measurements, that the soluble fraction consists mostly of anhydrous CaSO4, 3MgSO4.CaSO4, Na2Ca(SO4)2 and other double sulphates. The sample from one power plant burning black coal also contained CaCO3, CaO and K2CO3. The nucleation activity of the original ash sample, the ash without the water-soluble fraction and the separated fraction was found by the methods of nucleation deposition and the freezing of water drops. These measurements demonstrated that the soluble components, which, by themselves, exhibit low nucleation activity, considerably increase the nucleation activity of the ash when associated with the ash particles. |
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