Abstract
As a kind of low rank coal, ash of Zhundong coal contains relatively high content of alkali metals and alkaline earth metals, which leads to a strong slagging property. In this paper, the influence of kaolin and silica additive on the migration of alkali metal Na in Zhundong coal is studied by chemical thermodynamics calculation software, the results show that: The main form of sodium in the coal ash sample is Na2SO4. With the increase of temperature, the NaCl (g) in the ash sample begins to precipitate at 600 °C, and Na2SO4 changes to NaOH (g) and Na (g) at higher temperature. Both kaolin and silica can inhibit the release of sodium. After adding kaolin, NaAlSiO4 is the main form of solid Na in the ash, and after adding SiO2, Na2SiO3, Na2O2SiO2 and Na2O, 3SiO2 exist in the solid Na2SiO3.
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