铁基助熔剂对皖北刘桥二矿煤的灰熔融特性影响研究

Effect of ferrum-based flux on the melting characteristics of coal ash from coal blends using the Liu-qiao No.2 coal mine in Wan-bei

研究了铁基助熔剂对皖北刘桥二矿煤(AQ)灰熔融特征的影响,并对AQ煤灰在添加铁基助熔剂前后不同热处理温度下的矿物组成进行了XRD和红外光谱分析。结果表明,导致AQ煤灰熔点高的主要原因是1000℃以上形成的莫来石引起的;加入铁基助熔剂可以降低AQ煤灰的熔融温度;在高温下铁基助熔剂与煤灰中其他铝硅酸盐矿物发生反应,生成铁橄榄石和铁尖晶石等低温共熔化合物,从而使煤灰熔点明显下降。

The effect of ferrum-based flux on the melting characteristics of coal ash in coal blends from the Liu-qiao No. 2 coal mine in Wan-bei （AQ） was investigated. The change of the compositions of mineral under various temperatures before and after adding ferrum-based flux into AQ was studied by XRD and FT-IR. Results show that the presence of mullite formed over 1000℃ increases the melting point of coal-ash, leading to high melting temperature of AQ coal-ash. The coal ash fusion temperature will be decreased by adding ferrum-based flux. The eutectic mixtures such as fayalite and hercynite are easily formed between ferrum compounds under high temperature, which remarkably decreases the coal ash fusion temperature.