naa a22 4500 510748716 CHVBK 20180411083056.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11270-012-1389-9 doi (NATIONALLICENCE)springer-10.1007/s11270-012-1389-9 Technogenic Magnetic Particles in Alkaline Dusts from Power and Cement Plants [Elektronische Daten] [Tadeusz Magiera, Beata Gołuchowska, Mariola Jabłońska] During this study, we investigated the mineralogical characterization of technogenic magnetic particles (TMPs) contained in alkaline industrial dust and fly ash emitted by coal burning power plants and cement plants. The reaction of tested dust samples varied between values of pH8 and pH12. Their magnetic properties were characterized by measurement of magnetic susceptibility (χ), frequency dependence of magnetic susceptibility (χfd), and temperature dependence of magnetic susceptibility. Mineralogical and geochemical analyses included scanning electron microscopy with energy dispersive spectroscopy, microprobe analysis and X-ray diffraction. The TMPs in fly ash from hard coal combustion have the form of typical magnetic spherules with a smooth or corrugated surface as well as a skeletal morphology, composed of iron oxides (magnetite, maghemite, and magnesioferrite) that occurred in the form of incrustation on the surface of mullite, amorphous silica, or aluminosilicate particles. The TMPs observed in fly ash from lignite combustion have a similar morphological form but a different mineralogical composition. Instead of magnetite and magnesioferrite, maghemite and hematite with lower χ values were the prevailing magnetic minerals, which explains the much lower magnetic susceptibility of this kind of ash in comparison with the ash from hard coal combustion, and probably results from the lower temperature of lignite combustion. Morphology and mineralogical composition of TMPs in cement dust is more diverse. The magnetic fraction of cement dust occurs mostly in the form of angular and octahedral grains of a significantly finer granulation (<20μm); however, spherules are also present. A very characteristic magnetic form for cement dust is calcium ferrite (CaFe3O5). The greatest impact on the magnetic susceptibility of cement dust results from iron-bearing additives (often waste materials from other branches of industry), which should be considered the most dangerous to the environment. Stoichiometric analysis of micro-particles confirmed the presence of heavy metals such as Pb, Mn, Cd, and Zn connected with TMPs, which are carriers of magnetic signals in atmospheric dust. Therefore, in some cases, their presence in topsoil when detected by magnetic measurement can be treated as an indicator of inorganic soil contamination. The Author(s), 2012 Alkaline dusts nationallicence Magnetic susceptibility nationallicence Technogenic magnetic particles nationallicence Iron mineralogy nationallicence Magiera Tadeusz Department of Land Protection, University of Opole, Opole, Poland aut Gołuchowska Beata Department of Land Protection, University of Opole, Opole, Poland aut Jabłońska Mariola Department of Geochemistry, Mineralogy and Petrology, Faculty of Earth Sciences, University of Silesia, Sosnowiec, Poland aut Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-17 0049-6979 224:1<1 2013 224 11270 https://doi.org/10.1007/s11270-012-1389-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-012-1389-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Magiera Tadeusz Department of Land Protection, University of Opole, Opole, Poland aut NATIONALLICENCE 700 1- Gołuchowska Beata Department of Land Protection, University of Opole, Opole, Poland aut NATIONALLICENCE 700 1- Jabłońska Mariola Department of Geochemistry, Mineralogy and Petrology, Faculty of Earth Sciences, University of Silesia, Sosnowiec, Poland aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-17 0049-6979 224:1<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer