Leaching behavior of B, Se, and other elements from twenty-one of coal fly ash (CFA) was examined. The correlation between the leaching amount and the concentration of element in CFA was investigated. The leaching amounts of B, Ca, Se were essentially dependent upon their concentrations in CFA. The effect of pH in the leachate was assessed, and the leaching of Se tended to increase as the pH in the leachate was elevated. For B, the effect of pH upon the leaching was complex, and when the concentration of Ca was higher in the leachate, the formation of CaB(OH)_4^+ was suggested, resulting in the prevention of leaching.
