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采用二种原煤和二种混煤，对其加热过程中灰样中的硬石膏（ＣａＳＯ４）进行Ｘ－射线衍射分析，结果表明：煤灰样中ＣａＯ的固硫效果在９００℃左右时达到最大，然后逐渐减弱，在１１００℃左右时硫全部析出．混煤煤灰与单种煤煤灰中ＣａＯ的固硫作用相同，其固硫过程和行为一致．
Two kinds of raw coal and two kinds of mixed coal were used to analyze the X-ray diffraction of the anhydrite (CaSO4) in the gray sample during the heating process. The results showed that the sulfur-fixing effect of CaO in the coal ash reached the maximum at about 900 ℃ , Then gradually weakened, at about 1100 ℃ when all sulfur precipitation. The mixed coal ash has the same sulfur-fixing effect as CaO in single coal ash, and its sulfur-fixing process and behavior are the same.