添加CaCO3对煤灰熔融性影响与其机理的研究.PDF

第3卷 第9期 692 中国科技论文在线 SCIENCEPAPER ONLINE 2008年9月 添加 CaCO 对煤灰熔融性影响及其机理的研究 3 康 虹，吴国光，孟献梁，李建亮 （中国矿业大学化工学院, 江苏徐州 221008 ） 摘 要：考察了 CaCO3 不同添加量对三种低灰熔点煤样的软化温度(ST) 的影响，揭示了 CaCO3 对煤灰熔融性的影 响规律。同时结合 X 射线衍射技术及 CaO—Al2O3—SiO2 三元相图探讨了加入 CaCO3 后的煤灰熔融机理。结果表 明，煤灰熔点随 CaCO3 加入量的提高先降后升，当煤灰 CaO 超过一定含量后可起到提高灰熔点的阻熔剂作用。机 理表明氧化钙在加热过程中与其他成分会生成多种高含钙化合物，各物质之间会形成低温共熔化合物，造成灰熔点 降低，当钙含量过高时，由于过剩氧化钙的存在，灰熔点上升。 关键词：煤灰熔融性；添加剂；X衍射；三元相图 中图分类号：TQ533 文献标识码：A 文章编号：1673－7180(2008)09 －0692 －6 Study of increasing coal ash fusion temperature by using CaCO and its mechanism 3 KANG Hong ，WU Guoguang ，MENG Xianliang ，Li Jianliang (School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221008) Abstract: This work has studied the effect of different amount of CaCO3 on three low- fusion temperature coals’ST. It implies the rule of CaCO ’s effect on coal’s fusibility in the experiment process, with the help of the X-Ray 3 diffraction and CaO-Al O -SiO system ternary phase diagrams can explain the ash fusion mechanism after added 2 3 2 the CaCO , and also discussed CaO’s impact on the coal ash’s flubility. The result shows that along with the CaO’s 3 increasing, the coal ash fusion temperature is decreasing first,the it will be increasing finally, when CaO in coal ash preponderate over a certain content, the coal ash fusion