东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (5): 685-689.DOI: 10.12068/j.issn.1005-3026.2015.05.017

• 材料与冶金 • 上一篇    下一篇

CaO-TiO2-SiO2-NaAlO2体系的反应行为研究

王艳秀, 张廷安, 吕国志, 朱小峰   

  1. (东北大学 材料与冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2014-03-10 修回日期:2014-03-10 出版日期:2015-05-15 发布日期:2014-11-07
  • 通讯作者: 王艳秀
  • 作者简介:王艳秀(1991-),女,黑龙江牡丹江人,东北大学博士研究生; 张廷安(1960-),男,河南周口人,东北大学教授,博士生导师.
  • 基金资助:
    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).

Reaction Behaviors of CaO-TiO2-SiO2-NaAlO2 System

WANG Yan-xiu, ZHANG Ting-an, LYU Guo-zhi, ZHU Xiao-feng   

  1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2014-03-10 Revised:2014-03-10 Online:2015-05-15 Published:2014-11-07
  • Contact: ZHANG Ting-an
  • About author:-
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摘要: 研究了CaO-TiO2-SiO2-NaAlO2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CaO-TiO2-SiO2-NaAlO2体系的溶出反应行为如下:在质量比m(TiO2)/m(CaO)=1.42,m(TiO2)/m(SiO2)=0.49,时间1h,搅拌转速300r/min,Na2O的质量浓度mk=220g/L,分子比αk=3.1的条件下,TiO2进入碱液生成Na2TiO3,然后与NaAl(OH)4,Na2SiO3反应生成Al4Ti2SiO12,随温度升高Al4Ti2SiO12分解,生成钠硅渣和水化石榴石,温度继续升高,CaTiO3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CaTiO3,转变起始温度260℃.

关键词: 反应行为, 氧化铝, 锐钛矿, CaO-TiO2-SiO2-NaAlO2体系, 温度

Abstract: 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)/m(CaO) and m(TiO2)/m(SiO2) are 1.42 and 0.49, respectively, the time is 1h, the stirring speed is 300r/min, the mass concentration of Na2O (mk) is 220g/L and the molar ratio of Na2O and Al2O (αk) is 3.1), TiO2 reacts with alkali liquor to produce Na2TiO3, then reacts with NaAl(OH)4 and Na2SiO3 to produce Al4Ti2SiO12. With the increase of temperature, Al4Ti2SiO12 decomposes and sodium aluminosilicate hydrate and hydrogarnet form,the peak intensity of CaTiO3 increases and CaTiO3 becomes the main part of calcified slags. Finally, anatase converts to stable CaTiO3. The initial transition temperature is 260℃.

Key words: reaction behavior, alumina, anatase, CaO-TiO2-SiO2-NaAlO2 system, temperature

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