微量元素对磷铝酸盐熟料特征矿相LHSS形成的影响  

Influence of Mg^(2+)、Fe^(3+)、Ti^(4+) on the Formation of Calcium Phosphoaluminate Phase in Phosphoaluminate Clinker

作　　者：赵发伟[1] 李仕群[1] 衣朝华[1] 王伟[1] 刘飚[1] 胡佳山[1] 

机构地区：[1]济南大学材料科学与工程学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2007年第1期12-16,共5页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金(50572035);山东省自然科学基金(Q2003F02)

摘　　要：研究了微量Mg2+、Fe3+、Ti4+对提高磷铝酸盐水泥(phosphoaluminate cement,PALC)熟料特征矿相磷铝酸钙(LHSS)固溶体形成的影响。通过定量XRD并结合杨德尔方程和阿累尼乌斯方程计算出LHSS相的反应速率和反应的活化能。采用定性XRD研究了微量元素对PALC熟料矿物形成速率的影响。通过IR对典型试样的矿相组成及基团结构进行了分析。结果表明:微量Mg2+、Fe3+、Ti4+对提高LHSS相的反应速率、降低其生成活化能的效果十分显著。掺加Mg2+、Fe3+、Ti4+微量元素,使1 380℃时LHSS相形成速率常数K由0.025 min-1分别提高到0.051 min-10、.086 min-1、0.052 min-1,分别提高了104%、244%、108%,LHSS相的生成活化能由4.254×106J.mol-1分别降低到3.478×106J.mol-1、3.236×106J.mol-1和3.581×106J.mol-1,分别降低了18.2%、23.9%、15.8%。三者的最佳掺量分别为0.031 3 mol.kg-10、.006 25 mol.kg-10、.012 5 mol.kg-1。微量Mg2+、Fe3+、Ti4+使生料在煅烧过程中得到了较多的玻璃相,从而改善了PALC的矿相组成,提高了浆体的本征强度;还为缓减水泥生产对原料Mg2+含量严格控制的苛刻要求提供试验依据。The influence of microelements such as Mg^2＋, Fe^3＋, Ti^4＋ on the mineral formation of phosphoaluminate cement （PLAC） clinker＇ s special phase - calcium phosphoaluminate （ abbreviation LHSS） the solid solution phase was studied in this article. According to quantitative XRD analysis, the reaction velocity and active energy of LHSS phase were calculated by Youngdle and Arrhenius equations. The mineral phase component and group structures of typical samples were also studied by using quantitative XRD and IR analysis. Consequently, the influence of microelements on the forming velocity of PLAC clinker mineral was studied. The results show that the raw material added with Mg^2 ＋, Fe^3 ＋ , Ti^4＋ can dramatically improve the reaction rate and reduce the activation energy of forming LHSS phase. The formation rate constant K （ 1 380 ℃） of LHSS phase added with Fe^3＋ , Mg^2 ＋, Ti^4＋ were improved from 0. 025 min^-1 to 0.051 min^-1,0.086 min^-1,0. 052 min^-1, improvedby 104%, 244%, 108%, respectively, and the activation energy of forming the LHSS phase was decreased from 4.254 ×10^6 J·mol^-1 to 3.478 ×10^6 J-mol-1,3.236 ×10^6 J·mol^-1,3.581 ×10^6 J·mol^-1, decreased by 18.2%, 23.9%, 15.8%, respectively, and the best mixed quantity is 0.031 3 mol·kg^-1,0.006 25 mol·kg^-1 ,0.0125 mol·kg^-1, respectively. Through adding microelements to PLAC raw materials, we can get more glass phase during burning progress, so that the phase composition of PLAC and the intrinsic strength of the cement paste can be improved. It also can provide the experimental foundation for decreasing the rigorous requirement of the content of Mg^2 ＋ in cement production.

关 键 词：微量M^2+、Fe^3+、Ti^4+ 磷铝酸钙(LHSS)固溶体矿相 活化能 LHSS相形成速率常数 

分 类 号：TQ172[化学工程—水泥工业]