Abstract
Knowledge of the effect of aluminosilicates in fly ash on slagging is very important for the prevention and control of slagging in coal-fired boilers. To understand hydrochloric acid dissolution of the aluminum element of fly ash aluminosilicates at a chemical coordination level and establish a reliable method to characterize fly ash aluminosilicates that easily cause slagging, we performed hot hydrochloric acid separation for fly ashes with different melting points obtained from four power plants in China and measured the acid-solubility of major elements in the fly ashes. The fly ashes and their acid separation residues were analyzed using X-ray diffraction and 27Al magic-angle spinning nuclear magnetic resonance (27Al MAS NMR). The results show that the 6-fold coordinated aluminum (denoted as Al(VI)) in the fly ashes does not easily dissolve in hot hydrochloric acid. One part of the 4-fold coordinated aluminum (denoted as Al(IV)) easily dissolves in hydrochloric acid. The acid-soluble Al(IV) in ash has...
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