微波和酸蚀作用下石英砂中气液包裹体的去除机理

Removal mechanism of gas-liquid inclusions in quartz sand under microwave and acid corrosion

通过Leica偏光显微镜、傅里叶红外光谱仪、气相色谱仪等仪器表征,分析微波和酸蚀单独及共同作用国产高纯石英砂中气液包裹体中水分子含量和气液包裹体显微形态的变化规律,并对气液包裹体的去除机理进行研究。研究结果表明:在微波场作用下,石英砂中气液包裹体的水分子的红外吸收峰强度及面积大幅度增加,偏光显微图显示部分体积较大的气液包裹体体积减小,并有大量的体积较小的液相包体群生成;单独的酸蚀作用对石英砂中气液包裹体中水分子的红外吸收峰强度及面积几乎没有影响;在微波和酸蚀共同作用下,石英砂中气液包裹体的水分子红外吸收峰强度及面积大幅度降低,在经过HF酸蚀处理5 h后,石英砂中气液包裹体的水分子的红外吸收峰强度及面积均远小于原料中水分子的红外吸收峰强度及面积,此时石英砂样品光透过率最高,气液包裹体和羟基水(OH)-的去除效果最佳。

Using Leica polarizing microscope, gas chromatography and Fourier transform infrared spectroscopy （FT-IR）, the change rule of water content of gas-liquid inclusions in domestic high purity quartz sand was analYzed under microwave or acid erosion or microwave and acid corrosion, and the removal mechanism of gas-liquid inclusions was also studied. The results show that under acid corrosion, infrared absorption peak strength and area of water in gas-liquid inclusions are greatly increased, the volume of part gas-fluid inclusions with larger volume is reduced, and a large number of small liquid inclusion groups are formed under microwave treatment. The infrared absorption peak strength and area of water almost have no change. The infrared absorption peak strength and area of water are greatly reduced and are less than those of the raw materials under microwave and acid corrosion, and removal effect of gas-liquid inclusions and hydroxyl water （OH）- is best after 5 h HF acid erosion.