弱还原性气氛下Fe_2O_3对高灰熔点煤矿物变化行为影响的研究  

Effect of Fe_2O_3 on high melting coal ash mineral behavior under reducing atmosphere

作　　者：刘象 辛宇[1] 陶然[1] 李寒旭[1] 

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001

出　　处：《应用化工》2016年第4期641-644,648,共5页Applied Chemical Industry

基　　金：国家自然科学基金(21176003;21376006)

摘　　要：利用XRD、SEM-EDX分析了添加Fe_2O_3的LNC煤灰在高温弱还原性气氛下的矿物组成、微观形貌及微区化学组成变化情况。结果表明,Fe_2O_3的引入抑制了灰渣中莫来石的生成,高温下含铁矿物的生成及低温共熔降低了煤灰熔点;在高Fe_2O_3添加量下,多余的赤铁矿转化为磁铁矿。在弱还原性气氛中,受CO浓度及渣中溶解[O]的影响,未出现单质铁的析出现象。The behaviors of mineral matters,surface morphologies and micro-chemical composition of LNC coal added with Fe_2O_3 were investigated under reducing atmosphere at high temperature by XRD and SEM-EDX. The results show that the introduction of iron oxide inhibits the formation of mullite,the generation of iron-bearing minerals under high temperature and low temperature congruent melting reduces the ash fusion temperature. The rest of hematite transformed into magnetite with high Fe_2O_3 content. Under reducing atmosphere,iron precipitation was not detected,which was affected by the CO concentration and dissolved oxygen in molten slag.

关 键 词：煤灰 弱还原性气氛 矿物组成 

分 类 号：TQ53[化学工程—煤化学工程] TQ54