Speaker
Description
Coal fly ash, a byproduct of coal combustion in power plants, is widely utilized in construction, ceramics, and thermal insulation due to its pozzolanic properties and environmental benefits. The aim of this investigation is to determine thermal properties of several samples of coal fly ash obtained from different zones of electro precipitators from the REK Bitola Power Plant. Their chemical composition, primarily SiO₂ (48.81 - 50.33 wt.%) and Al₂O₃ (17.62 - 18.59 wt.%), influences their thermal behavior, including fusion temperature and sintering characteristics. Heating microscopy analysis revealed distinct thermal transformation stages: the sintering region (1110 - 1200°C), the softening region (1200 – 1260°C), and the melting temperature range (1240 – 1320°C). Content of CaO (10.74 -13.76 wt.%) contributes to lowering the melting point, while Fe₂O₃ (7.68 - 7.91 wt.%) enhances thermal conductivity. Understanding these properties is essential for optimizing fly ash applications, reducing industrial waste, and improving material performance in sustainable construction.
Keywords: coal fly ash, heating microscopy, thermal properties
| Scientific Sections | Revalorization of bio- and industrial waste |
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