羟基化TiO_(2)对水泥窑用镁质轻质骨料性能的影响  

Effect of hydroxylated TiO_(2) on properties of lightweight magnesia aggregates for cement kilns

作　　者：孙格格 李国华 矫长发 田琳 邓舒丹 Sun Gege;Li Guohua;Jiao Changfa;Tian Lin;Deng Shudan(College of Materials and Metallurgy,University of Science and Technology Liao-ning,Anshan 114051,Liaoning,China;不详)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《耐火材料》2024年第5期393-399,共7页Refractories

基　　金：国家重点研发计划项目(2017YFB0310701)。

摘　　要：为了改善水泥回转窑用烧成带耐材的高负荷和高导热问题,开发适用于水泥窑的轻质骨料。以轻烧氧化镁粉为原料,十二烷基苯磺酸钠为发泡剂,三乙醇胺为分散剂,TiO_(2)为助烧剂,先制取镁质泡沫料浆,再于1600℃下保温2 h热处理制备镁质轻质骨料。研究TiO_(2)加入量(加入质量分数分别为0、0.5%、1.0%、1.5%、2.0%和2.5%)对镁质泡沫料浆及镁质轻质骨料性能和显微结构的影响。结果表明:1)TiO_(2)表面发生羟基化,随TiO_(2)加入量增加,泡沫料浆黏度增加,表面张力和接触角减小,料浆内气泡平均直径为114.30~53.76μm;2)TiO_(2)与轻烧氧化镁粉中的CaO反应生成CaTiO_(3),随TiO_(2)加入量的增加,氧化镁晶粒平均尺寸增大,晶间气孔减少,轻质骨料试样的体积密度增大,显气孔率减小;3)当TiO_(2)加入量为1.0%(w)时,试样物理性能最优。In order to address the challenges of high load and high thermal conductivity of refractory materials in the firing zone of cement rotary kilns,suitable lightweight aggregates for cement kilns were developed.Foaming slurries were first prepared employing light-burned magnesia powder as the raw material,sodium dodecyl benzene sulfonate(SDBS)as the foaming agent,triethanolamine(TEA)as the dispersant,and TiO_(2) as the sintering aid.Then MgO foam slurries were prepared,and lightweight magnesia aggregates were successfully synthesized after firing the MgO foam slurries at 1600℃for 2 h.The effects of the TiO_(2) addition(0,0.5%,1.0%,1.5%,2.0%,and 2.5%,by mass)on the properties and microstructure of magnesia foam slurries and lightweight magnesia aggregates were investigated.The results show that(1)TiO_(2) surface hydroxylates;as the TiO_(2) addition increases,the viscosity of the foam slurries increases,while the surface tension and contact angle decrease;the average size of the bubbles in the slurries ranges from 114.30 to 53.76μm;(2)TiO_(2) reacts with CaO in the light-burned magnesia powder,forming CaTiO_(3);as the TiO_(2) addition increases,the average grain size of magnesia increases,the amount of intergranular pores decreases,the bulk density of the lightweight aggregates increases,and the apparent porosity decreases;(3)the optimum physical properties were achieved when the TiO_(2) addition was 1.0%.

关 键 词：镁质轻质骨料 显微结构 羟基化TiO_(2) 

分 类 号：TQ175[化学工程—硅酸盐工业]