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OALib Journal期刊
ISSN: 2333-9721
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mg2+和na+对高熔点煤灰熔融性的影响
, PP. 1161-1166
Keywords: 灰熔点,煤灰,熔融性
Abstract:
？以山西阳泉固庄高熔点煤灰为研究对象,通过向煤灰中添加不同量的mgo与na2co3,研究了mg2+与na+在高温下对煤灰熔融性的影响。研究结果表明,煤灰熔融温度随氧化镁的添加(5%~25%)单调下降;而随氧化钠添加(5%~25%)出现先降后升现象,在氧化钠添加量为15%时,灰熔点达到最低。xrd分析表明,阳泉固庄煤灰熔融温度高(大于1750℃)的原因是高温条件下耐熔矿物莫来石、方英石的存在。添加外加剂后,高温时外加剂与硅酸盐矿物反应,生成了更多的低共熔矿物霞石、堇青石等。同时,mg2+和na+的加入会使得非桥氧数量增多,高温煤灰低聚物增多,降低了煤灰的熔融温度。通过三元相图以及sem分析,高温条件下煤灰中部分元素的富集以及团聚现象是导致mg2+和na+对煤灰熔融温度影响不同的原因。
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