M?ssbauer characterization of feed coal, ash and fly ash from a thermal power plant

摘要

The aim of this work was apply 57Fe Transmission M?ssbauer Spectroscopy at room temperature in order to study the occurrence of iron-containing mineral phases in: 1) feed coal; 2) coal ash, obtained in different stages of the ASTM D3174 standard method; and 3) fly ash, produced when coal is burned in the TERMOPAIPA IV thermal power plant localized in Boyacá, Colombia. According to obtained results, we can conclude the occurrence of pyrite and jarosite in the feed coal; Fe~(2+) and Fe~(3+) crystalline paramagnetic phases, superparamagnetic hematite and hematite in coal ash; Fe~(2+) and Fe~(3+) noncrystalline and crystalline phases, magnetite and hematite in fly ash. Precisely, for a basic understanding, this work discusses some the possible transformations that take place during coal combustion.