霞石正长岩中温烧结反应过程研究  

Sintering Reaction Process in the System of the Nepheline Syenite:An Experimental Study

作　　者：徐锦明[1] 马鸿文[1] 郭庆丰[1] 杨冰北[1] 

机构地区：[1]中国地质大学材料科学与工程学院,北京100083

出　　处：《吉林大学学报（地球科学版）》2010年第6期1295-1300,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家'十一.五'科技支撑计划项目(2006BAD10B04)

摘　　要：针对国内铝土矿和钾盐短缺、严重依赖进口的现状,综合开发利用储量巨大的非水溶性钾矿具重要意义。本实验以具有典型代表性的云南个旧白云山霞石正长岩为原料,研究了以碳酸钠为助剂烧结反应过程中可能存在的化学反应;并以热力学计算结果为指导,研究了霞石正长岩-碳酸钠体系的烧结配比、烧结时间和烧结温度对霞石正长岩分解率的影响。实验结果表明:在烧结温度1103K、烧结时间1h、霞石正长岩与助剂碳酸钠质量比为1∶0.75时,霞石正长岩的分解率可达98.0%。对霞石正长岩热分解过程的动力学研究结果表明:该过程符合Crank-Ginstling-Braunshtein方程,其表观活化能为78.75kJ/mol;根据阿伦尼乌斯公式对反应时间进行了预测,认为离子扩散穿透厚度增加的固膜是造成理论与实际反应时间出现误差的主要原因。It ＇s significant to comprehensively utilize abundant water-unsolubility potass resource for solving the shortage of bauxite and sylvite in China. The sintering reaction process of nepheline syenite collected from Gejiu, Yunnan Province, is studied, with sodium carbonate as the additive. It is suggested that the nepheline syenite be sintered at 1 103 K for one hour, with the rate of the additive （sodium carbonate） as 1 ： 0.75, the decomposition rate of minerals in the nepheline syenite could up to 98.0%. Dynamics of the thermal decompose of nepheline syenite were explored, and the results indicate the process fit Crank-Ginstling-Braunshtein equation, and all apparent activation energy 78.75 kJ/mol for the decomposing reactions was derived from experimental data. According to the Arrhenius equation, the reacting time is prospected. It is concluded that solid film, which increases thickness of ion penetrating and diffuseing, causes temporal error between theoretic and practical reaction.

关 键 词：霞石正长岩 中温烧结 热力学 动力学 铝土矿床 钾盐 个旧 

分 类 号：P619.211[天文地球—矿床学]