CaO-TiO_2-SiO_2-NaAlO_2体系的反应行为研究  

Reaction Behaviors of CaO- TiO_2- SiO_2- NaAlO_2 System

作　　者：王艳秀[1] 张廷安[1] 吕国志[1] 朱小峰[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2015年第5期685-689,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金联合基金重点资助项目(U1202274);国家自然科学基金青年基金资助项目(51204040)

摘　　要：研究了Ca O-Ti O2-Si O2-Na Al O2体系下以锐钛矿为主的反应行为:热力学确定了平衡固相及其相对稳定程度;动力学计算反应级数、活化能,判断反应控制机制;钙化实验确定具体反应、分析了反应行为.结果表明Ca O-Ti O2-Si O2-Na Al O2体系的溶出反应行为如下:在质量比m(Ti O2)/m(Ca O)=1.42,m(Ti O2)/m(Si O2)=0.49,时间1 h,搅拌转速300 r/min,Na2O的质量浓度mk=220 g/L,分子比αk=3.1的条件下,Ti O2进入碱液生成Na2Ti O3,然后与Na Al(OH)4,Na2Si O3反应生成Al4Ti2Si O12,随温度升高Al4Ti2Si O12分解,生成钠硅渣和水化石榴石,温度继续升高,Ca Ti O3峰的强度逐渐超过其他物相成为钙化渣的主体,锐钛矿最终转型为稳定的Ca Ti O3,转变起始温度260℃.Reaction behaviors of CaO-TiO2-SiO2-NaAlO2 system （anatase mainly ） was investigated. The equilibrium phase and relatively stable level were determined by means of thermodynamic calculation. The reaction order, activation energy and reaction control mechanism were determined through kinetics analysis. The reaction behaviors were analyzed by calcification experiments. The results showed that the reaction behaviors of CaO-TiO2-SiO2-NaAlO2 system are as follows： under given conditions （the mass ratios of m （TiO2 ）/rn （CaO） and m（TiO2）/m （ SiO2 ） are 1.42 and 0. 49, respectively, the time is 1 h, the stirring speed is 300 r/rain, the mass concentration of Na20 （rot） is 220 g/L and the molar ratio of Na20 and A120 （%） is 3.1 ）, TiO2 reacts with alkali liquor to produce NaETiO3, then reacts with NaAl（OH） 4 and NaESiO3 to produce Al4TiESiO12. With the increase of temperature, Al4Ti2SiO12 decomposes and sodium aluminosilicate hydrate and hydrogarnet form, the peak intensity of CaZiO3 increases and CaTiO3 becomes the main part of calcified slags. Finally, anatase converts to stable CaZiO3. The initial transition temperature is 260 ℃.

关 键 词：反应行为 氧化铝 锐钛矿 CaO-TiO2-SiO2-NaAlO2体系 温度 

分 类 号：TF821[冶金工程—有色金属冶金]