铁钙比对煤灰中耐熔矿物生成的抑制机理研究  

Inhibition Mechanism of the Ratio of Fe_2O_3/CaO on Formation of Refractory Mineral in Coal Ash

作　　者：陶然[1] 李寒旭[1] 胡洋[1] 王蓓蓓 邓业新 张钊[1] 武成利[1] 

机构地区：[1]安徽理工大学化学工程学院,淮南232001

出　　处：《硅酸盐通报》2017年第11期3810-3816,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(21376006);安徽省科技重大专项(15czz02045)

摘　　要：铁基助熔剂和钙基助熔剂能有效降低煤灰熔融温度,为了研究铁钙比(Fe_2O_3/CaO)对煤灰中耐熔矿物生成的抑制机理,根据煤灰化学成分组成,在三种不同系列的煤中加入含铁助剂,调整煤中的铁钙比,对煤灰进行灰熔融温度、煤灰成分分析,对还原性气氛下制备的煤灰渣进行X射线衍射分析(XRD)。结果表明:加入含铁助剂可降低煤灰熔融温度,在相同铁钙比下,加入Fe助剂的煤灰熔融温度低于加入FeS_2助剂的煤灰熔融温度,硫在煤灰中起增加煤灰熔融温度的作用;煤灰中铁钙比不同对高熔点矿物的生成影响不同,当铁钙比在1~2间时,灰渣中仅有钙长石,当铁钙比在3.5~5.5间时,灰渣中既有钙长石的也有耐熔矿物莫来石的存在,煤灰中铁质矿物和钙质矿物的含量对耐熔矿物的生成有很大影响。The coal ash fusion temperature was obviously reduced by adding iron-based flux and calciumbased flux. In order to research the inhibition mechanism of the ratio of Fe_2O_3/CaO on formation of refractory mineral in coal ash,according to coal ash composition,iron-containing flux was added to three different series of coal to adjust the ratio of Fe_2O_3/CaO. Coal ash fusion temperature and coal ash composition were analyzed. Meanwhile,the crystalline mineral composition of coal ash slag prepared in reducing atmosphere was analyzed by X-ray diffraction（ XRD）. The results show that addition of ironcontaining flux can decrease coal ash fusion temperature. Under the same ratio of Fe_2O_3/CaO,the ash fusion temperature added with Fe flux is lower than that of FeS_2 flux,and sulfur in coal ash plays the role of increasing fusion temperature. Different ratios of Fe_2O_3/CaO have different influence on the formation of high melting point mineral. When the ratio of Fe_2O_3/CaO is within 1-2,there are only anorthite in the slag. When the ratio of Fe_2O_3/CaO is within 3. 5-5. 5,there are both anorthite and refractory mineral mullite. And the content of iron and calcium minerals have a significant effect on the formation of refractory mineral.

关 键 词：铁钙比 含铁助剂 耐熔矿物 

分 类 号：TQ536[化学工程—煤化学工程]