玉米淀粉造孔剂对富铝煤矸石合成轻质莫来石料的影响  

Effect of corn starch on synthesizing lightweight mullite from alumina-rich coal gangue

作　　者：陈金凤[1] 赵惠忠[1] 张寒[1] 余俊[1] 李静捷 王立锋[1] 

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《耐火材料》2015年第2期120-123,共4页Refractories

摘　　要：为了综合利用煤矸石,以天然富铝煤矸石矿为原料,聚乙烯醇(PVA)为结合剂,玉米淀粉为造孔剂,于1 500℃保温3 h反应烧结合成轻质莫来石料,研究了造孔剂加入量(其质量分数分别为10%、20%、30%、40%、50%)对轻质莫来石烧结性能以及显微结构的影响。结果表明:随着玉米淀粉加入量的增大,合成的轻质莫来石料体积密度明显降低,显气孔率和线收缩率显著增大,玉米淀粉的添加量以40%(w)为宜,此时合成的轻质莫来石料的体积密度和显气孔率分别为1.21 g·cm-3和62%;合成的轻质莫来石料的主晶相为莫来石,次晶相为刚玉,莫来石晶体呈柱状发育,刚玉晶粒被莫来石晶粒包裹,构成了疏松的空间网络结构。In order to comprehensively utilize coal gangue, lightweight mullite was prepared using natural alumina-rich coal gangue as raw material,PVA as binder,and corn starch as pore-forming agent,and firing at 1 500℃ for 3 h. Effects of pore-forming agent additions （10% ,20% ,30% ,40% ,and 50%, in mass） on sintering properties and microstructure of lightweight mullite were researched. The results show that with corn starch addition increasing, the bulk density decreases obviously, the apparent porosity and linear shrinkage rate increase. With the optimal corn starch addition of 40mass% ,the lightweight mullite has bulk density of 1.21 g · cm^-3 and apparent porosity of 62% ;for the synthesized lightweight mullite,mullite is the main phase,corundum is the secondary phase,the mullite crystals are in columnar,the corundum grains are surrounded by mullite grains,forming a loose network structure.

关 键 词：富铝煤矸石 轻质莫来石料 玉米淀粉 造孔剂 

分 类 号：TQ175[化学工程—硅酸盐工业]