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以冷水江页岩煤灰为基灰,向其添加不同质量的Fe2O3粉末,制成Fe2O3含量分别为1.53%、10%、20%、30%和40%煤灰试样若干。首先采用角锥法测量Fe2O3含量变化对煤灰熔融特性的影响,然后将不同Fe2O3含量煤灰均匀疏松的敷设在碳化硅、高铝刚玉、中铝刚玉3种卫燃带耐火材料板表面,并将其置入高温马弗炉内于1 330℃下煅烧40 h,待煅烧完成后,观察3种卫燃带耐火材料板表面的结渣特性,并对灰渣进行X射线衍射分析。试验结果表明:随煤灰中Fe2O3含量的增加,煤灰熔融温度均呈下降趋势,同时在卫燃带耐火材料板表面结渣程度均趋于严重,但当煤灰中Fe2O3含量增至一定值后,其熔融温度反而呈上升趋势,且在卫燃带耐火材料板表面结渣程度将不再继续增强,反而有所降低。
Taking shale coal ash of Lengshuijiang as the base ash, Fe2O3 powder with different mass was added to it to make some samples with Fe2O3 content of 1.53%, 10%, 20%, 30% and 40% respectively. Firstly, the pyrite method was used to measure the influence of the content of Fe2O3 on the melting characteristics of coal ash. Then the coal ash with different content of Fe2O3 was loosely laid on the surfaces of the three kinds of refractory slabs with silicon carbide, high alumina corundum and aluminum aluminum corundum Put it into the muffle furnace at high temperature for calcination at 1 330 ℃ for 40 h. After the calcination was completed, the slagging characteristics of the surface of the three kinds of deflagration belt refractories plates were observed, and the ash was analyzed by X-ray diffraction. The results show that with the increase of Fe2O3 content in coal ash, the melting temperature of coal ash shows a downward trend, meanwhile the degree of slagging on the refractory board surface tends to be serious. However, when the content of Fe2O3 in coal ash increases to a certain value After that, the melting temperature rises instead, and the degree of slagging on the refractory slab surface will no longer continue to increase, but rather decreases.