TY - JOUR N2 - Fly ash which has been separated from the flue gas stream as a result of fossil fuels combustion constitutes a huge amount of waste generated worldwide. Due to environmental problems, many directions of their rational use have been developed. Various attempts to convert fly ash into sorption materials, mainly synthetic zeolites, are conducted successfully. In this paper, an attempt was made to convert fly ash from lignite combustion from one of the Polish power plants, using alkaline hydrothermal synthesis. The primary phases in the fly ash were: quartz, gehlenite, mullite, hematite, feldspar, lime, anhydrite, occasionally grains of ZnO phase and pyrrhotite, glass and unburned fuel grains. As a result of hydrothermal synthesis a material containing new phases – pitiglianoite and tobermorite was obtained. Among the primary ash constituents, only gehlenite with an unburned organic substance, on which tobermorite with crystallized pitiglianoite was present. As a result of detailed testing of products after synthesis, it was found that among the tested grains: • two populations can be distinguished – grains containing MgO and Fe2O3 as well as grains containing Fe2O3 or MgO or containing none of these components, • the main quantitative component was pitiglianoite, • pitiglianoite was present in larger amounts in grains containing Fe2O3 or MgO or in the absence of both components than in grains in which Fe2O3 and MgO were found. The results of the study indicate that in post-synthesis products, the contribution of components were as follows: pitiglianoite – 39.5% mas., tobermorite – 54% mas., gehlenite – 3% mas. and organic substance – 3.5% mas. L1 - http://www.czasopisma.pan.pl/Content/112121/PDF/cempa-i-inni.pdf L2 - http://www.czasopisma.pan.pl/Content/112121 PY - 2019 IS - No 3 EP - 22 DO - 10.24425/gsm.2019.128526 KW - fly ash KW - tobermorite KW - pitiglianoite KW - melilite A1 - Białecka, Barbara A1 - Adamczyk, Zdzisław A1 - Cempa, Magdalena PB - Komitet Zrównoważonej Gospodarki Surowcami Mineralnymi PAN PB - Instytut Gospodarki Surowcami Mineralnymi i Energią PAN VL - vol. 35 DA - 2019.09.30 T1 - Synthesis of pitiglianoit and tobermorite from fly ash originating from lignite combustion SP - 5 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/112121 T2 - Gospodarka Surowcami Mineralnymi - Mineral Resources Management ER -