由煤矸石制备塞隆材料的反应条件研究  

Research on the reactive conditions of synthesizing SiAlON material from coal gangue

作　　者：段锋[1,2] 刘民生[1] 马爱琼[1] 高云琴[1] 

机构地区：[1]西安建筑科技大学材料与矿资学院,陕西西安710055 [2]西部建筑科技重点实验室(筹),陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2013年第5期744-749,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金委与神华集团联合基金资助项目(U1261118)

摘　　要：以内蒙古煤矸石为主要原料,采用高温还原氮化方法合成塞隆材料,研究了碳含量、煅烧温度以及保温时间对煤矸石碳热还原氮化反应程度和反应产物的影响.通过试样烧失率的计算,以及采用XRD和SEM分析,研究煤矸石在碳热氮化反应过程中得到β′-SiAlON相、X相及O′-SiAlON相的反应条件.研究表明:反应过程中,随着还原剂碳的增加,试样的烧失率逐渐增大,而保温时间对烧失率和反应生成物的影响不大;在煤矸石碳热还原氮化反应中,反应生成物X相均较少,最高只有12.88%,反应条件应为反应温度高于1 420℃,含碳量大于10%;还原剂碳含量和温度对生成β′-SiAlON相、O′-SiAlON相有显著影响,还原剂碳的合适加入量为10%～16%;当反应温度高于1 420℃×6h时,有利于β′-SiAlON相、O′-SiAlON相的生成.在1 420℃、含碳量14%时,生成主晶相β′-SiAlON相占57.21%;在1 350℃,Z=0.4时,碳含量为16%时,生成O′-SiAlON相占23.80%.Using Inner Mongolia coal gangue as the main raw material, different SiAION products were synthesized by high temperature carbothermal reduction-nitridation and some reactive conditions such as the content of carbon, calcining tem- perature and keeping time influencing on extent of reaction and reactive products were researched. By calculating the loss rate of ignition of samples, using XRD and SEM analysis, the reactive conditions getting ~Ir-SiA1ON, X-phase and O＇- SiAION phase by carbothermal reduction-nitridation reaction of coal gangue were studied. The results show that the loss rate of ignition of specimens rises with carbon reducer increasing and keeping time has a little influence on the loss rate of ignition of specimens. During the carbothermal reduction and nitridation reaction of coal gangue, the yield of X phase is low and the highest yield is only 12.88 % under the reactive conditions of temperature higher than 1 420 ℃ and carbon re- ducer above 10 %. The content of carbon reducer and reactive temperature greatly influences the yield of β＇-SiA1ON and O＇-SiAION phase. The appropriate addition of reducer carbon is 10 - 16 %, and the reaction temperature over 1 420 ℃ and keeping time of 6h are beneficial to the formation of X phase,β＇-SiAION and O＇-SiAION. Under the reactive con- ditions of temperature 1 420 ℃ and carbon reducer 14%, the yield of β＇-SiA1ON phase is 57. 21%. Under the reactive conditions of temperature 1 350 ℃, Z=0.4 and carbon reducer 16 %, the yield of OI-SiAION phase is 23.80 %.

关 键 词：煤矸石 碳热还原氮化反应 塞隆 反应条件 

分 类 号：P513[天文地球—地质学] TU398[建筑科学—结构工程]