不同温度下钙芒硝矿溶解细观结构显微CT试验研究  

Experimental study on meso-structure of glauberite soaked in water under different temperature

作　　者：杨晓琴[1] 梁卫国[1] 张传达[1] 高红波[1] 于艳梅[1] 岳广义[1] 张鹏[1] 

机构地区：[1]太原理工大学矿业工程学院原位改性采矿教育部重点实验室,山西太原030024

出　　处：《煤炭学报》2012年第12期2031-2037,共7页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50874078);教育部新世纪优秀人才支持计划资助项目(NCET-07-0594);全国优秀博士学位论文作者专项资金资助项目(200959)

摘　　要：对不同溶浸条件下的钙芒硝矿样进行了显微CT扫描实验,观测钙芒硝某一固定层面的物理细观结构在水溶液溶浸作用下的变化规律与特征,揭示了溶浸温度与时间对钙芒硝溶解特性的影响。结合钙芒硝溶解的宏观质量变化与细观孔隙率及裂纹演化,研究了不同温度下的钙芒硝溶解特性。根据实验与理论分析结果,得到:钙芒硝矿中Na2SO4在未达到其饱和溶解度前,溶解不断进行,同时,存在CaSO4的溶解与水化结晶两个动态平衡;溶解和结晶的速度影响钙芒硝孔隙率的变化;室温溶浸时,钙芒硝容易碎裂,35℃时,钙芒硝溶解相对稳定,65℃和95℃时,短时间内溶解速度较高,随着时间增长,溶解速度减小,且95℃溶速低于65℃;不同温度钙芒硝的溶解-渗透方式不同。The glauberite soaked under different conditions were scanned by micro CT,focused on the microscopic changes on a fixed lay,and studied the law of glauberite soaked in water affected by temperature and time.This paper combined macroscopic quality changes and microscopic porosity and crack evolution to study the dissolution properties of glauberite under different temperatures.According to the experimental data and theoretical analysis,got conclusion as follows：dissolution of glauberite continues before Na2SO4 reaches its saturation solubility,and two dynamic balance—dissolution and hydration of CaSO4 coexists in the same time.Glauberite porosity is impacted by the speed of dissolution and crystallization.Glauberite easily brokes when dissolved at room temperature,but it is relatively stable at 35,65 and 95 ℃,solution velocity is high within short time,but decreases with time increasing,and solution speed at 95 ℃ is lower than 65 ℃.The ways of glauberite dissolution-penetration are different under different temperature.

关 键 词：钙芒硝 细观结构 溶解 温度时间效应 

分 类 号：TU45[建筑科学—岩土工程]