酸浸辅助微波场去除石英砂中气液包裹体的研究

发布时间：2018-06-10 19:52

  本文选题：石英砂 + 微波场　； 参考：《湖南工业大学》2015年硕士论文

【摘要】：随着高科技产业的高速发展,高纯石英玻璃的需求量越来越大,由于其理想原料矿天然水晶的储量已近枯竭,而且极不均匀地分布在世界各地。所以,探索利用普通石英矿替代天然水晶作为原料制备高纯石英玻璃是现代工业发展的迫切需求。普通石英矿中普遍含有气液包裹体且现有工艺技术难以根本去除,这种结构性杂质是石英玻璃产生气泡等缺陷的主要原因。因此,去除气液包裹体是实现提纯普通石英矿制备高纯石英玻璃原料的重点与难点。本文根据微波作为“体热源”及其选择性加热的特点,首先选择适合采用微波场作用的优质石英矿,在此基础上研究了石英砂在微波场中加热至不同温度时对气液包裹体的去除影响;建立了气液包裹体一元纯水体系热爆裂模型;最后采用微波后再酸洗的工艺进一步去除石英砂中气液包裹体及主要的杂质离子。主要研究内容如下:(1)首先对四个不同地区的石英矿进行矿理分析,结果表明:马达加斯加地区石英矿中气液包裹体和主要杂质离子的总含量最少且气液包裹体的液相填充度相对较高。因此,马达加斯加石英矿为最适合本实验的原料矿。通过微波加热石英砂实验可知:石英砂在微波场中加热至600℃、900℃时,样品中的气液包裹体含量急剧下降。红外光谱检测结果表明:经微波场处理后的石英砂中水分子含量较原料下降明显。通过SEM和偏光显微镜分析可知:经微波场加热至900℃恒温120min处理后的石英砂颗粒表面产生的微裂纹较多且更宽,这更有利于气液包裹体爆裂逸出。(2)根据微波物理化学、流体包裹体热力学等理论建立了气液包裹体(一元纯水体系)在微波场中的热爆裂模型,更深层次的认识与理解微波“打开”气液包裹体的热力学特性,并解释了少量微小气液包裹体难以在微波场中爆裂的根本原因。(3)采用微波后再酸洗的工艺处理石英砂,探索了酸的种类、酸洗温度及酸洗时间对石英砂中气液包裹体及主要杂质离子含量的影响,确定了混合酸配比为20%HCl、20%H2C2O4、15%HF、45%H2O,酸洗时间为6h,酸洗温度为80℃的最佳酸洗工艺。
[Abstract]:With the rapid development of high-tech industry, the demand for high-purity quartz glass is increasing. Because of its ideal raw material ore natural crystal reserves have been nearly depleted, and extremely uneven distribution around the world. Therefore, it is an urgent need for modern industrial development to explore the use of ordinary quartz instead of natural crystal as raw material to prepare high purity quartz glass. Gas-liquid inclusions are commonly found in common quartz ores and the existing technology is difficult to remove them. This kind of structural impurity is the main reason for the defects such as bubbles in quartz glass. Therefore, removing gas-liquid inclusions is an important and difficult point in the preparation of high purity quartz glass from ordinary quartz ores. According to the characteristics of microwave as a "body heat source" and its selective heating, a high quality quartz ore suitable for microwave field is first selected. On this basis, the effect of quartz sand on the removal of gas-liquid inclusions at different temperatures in microwave field is studied, and the thermal burst model of gas-liquid inclusions with pure water system is established. Finally, the gas-liquid inclusions and main impurity ions in quartz sand were removed by microwave and acid pickling. The main contents of the study are as follows: (1) first of all, the mineralogical analysis of quartz deposits in four different regions has been carried out. The results show that the total contents of gas-liquid inclusions and main impurity ions in quartz ores in Madagascar are the least and the liquid filling degree of gas-liquid inclusions is relatively high. Therefore, Madagascar quartz ore is the most suitable raw material ore for this experiment. Through the experiment of quartz sand heated by microwave, it can be seen that when quartz sand is heated to 600 鈩，

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