关键词: 铁钙比;含铁助剂;耐熔矿物

Abstract: The coal ash fusion temperature was obviously reduced by adding iron-based flux and calcium-based flux. In order to research the inhibition mechanism of the ratio of Fe2O3/CaO on formation of refractory mineral in coal ash,according to coal ash composition,iron-containing flux was added to three different series of coal to adjust the ratio of Fe2O3/CaO. Coal ash fusion temperature and coal ash composition were analyzed. Meanwhile,the crystalline mineral composition of coal ash slag prepared in reducing atmosphere was analyzed by X-ray diffraction (XRD ). The results show that addition of iron-containing flux can decrease coal ash fusion temperature. Under the same ratio of Fe2O3/CaO,the ash fusion temperature added with Fe flux is lower than that of FeS2 flux,and sulfur in coal ash plays the role of increasing fusion temperature. Different ratios of Fe2O3/CaO have different influence on the formation of high melting point mineral. When the ratio of Fe2O3/CaO is within 1-2,there are only anorthite in the slag. When the ratio of Fe2O3/CaO is within 3. 5-5. 5,there are both anorthite and refractory mineral mullite. And the content of iron and calcium minerals have a significant effect on the formation of refractory mineral.

Key words: ratio of Fe2O3/CaO;iron-containing flux;refractory mineral