碱金属K对无烟煤灰熔融性的影响规律

Effect of alkali metal K on the fusibility of anthracite ash

借助灰熔融性测定仪、X射线荧光光谱分析仪和热力学计算软件FactSage考察了不同比例的碱金属K对山西典型无烟煤煤灰熔融性的影响规律。结果表明:当K2O的添加比例为10%时可有效降低无烟煤灰的熔融温度,而K_2O的添加比例超过10%时,煤灰熔融温度有上升的趋势;当K2O的添加比例为10%时,灰中的主要耐熔矿物质石英(SiO2)、白榴石(KAlSi2O6)和钙长石(CaAl2Si2O8)等完全分解,是煤灰熔融温度降低的主要原因。

The effects of different proportions of alkali metal K on Shanxi anthracite ash melting characteristics were analyzed with ash fusion temperature(AFT)test,X-ray fluorescence spectrum analyzer and FactSage software.The results showed that the melting temperature of anthracite ash obviously decreases when the addition ratio of K2O is 10%.However,the melting temperature of coal ash tends to rise while the proportion of K2O goes over 10%.When the addition ratio of K2O is 10%,the main refractory minerals in the ash such as quartz(SiO2)»leucite(KAlSi2O6)and anorthite(CaAl2Si2O8)are completely decomposed,which leads to a decrease of AFT.