脉石英晶体化学特征及其与高纯石英提纯效果的关系
发布时间：2018-11-12 18:24
【摘要】：高纯石英是生产单晶硅、多晶硅、石英玻璃、光纤、太阳能电池、集成电路基板等高性能材料的主要原料,在光伏产业和半导体制造链中被视为一个重要的组成部分。高纯石英一般都是经过精选和提纯加工而成,其最初的原料为一、二级天然水晶。然而全世界水晶资源稀缺,且分布不均,寻找其他石英矿物替代物就变得尤为重要。在众多石英矿物中,脉石英的SiO2含量一般在99%以上,纯度高,杂质少,是加工高纯石英的理想原料。但是,并非所有脉石英都能提纯加工为高纯度的高纯石英,由于不同产地的脉石英其成矿地质条件有所不同,导致其化学成分和晶体结构有所不同,对于提纯加工的效果也不相同。因此,如何识别优质的脉石英成为重要的研究方向。本文采用同一种提纯加工方法对选自18个不同产地的脉石英进行提纯,然后对提纯加工前后的样品进行ICP检测,红外吸收光谱分析,X射线衍射分析,并对脉石英晶体化学特征与其高纯石英提纯效果的关系进行了探究。其主要的实验结果如下:(1)根据脉石英提纯后杂质含量的ICP检测结果,可将18原矿样品分为上、中、下三等:上等脉石英,SiO2含量99.995%;中等脉石英,SiO2的含量为99.99%~99.995%;下等脉石英,SiO2的含量99.99%。(2)提纯加工后,上等脉石英的Li+Na+K和Al+B+Fe平均摩尔量分别为0.3558 mol和0.5528 mol,前者比后者小0.197 mol;中等脉石英的Li+Na+K和Al+B+Fe平均摩尔量分别为1.3784 mol和0.8015 mol,前者比后者大0.5769 mol;下等脉石英的Li+Na+K和Al+B+Fe平均摩尔量分别为3.0517 mol和2.5535 mol,前者比后者大0.4982 mol。(3)当提纯后的脉石英中铝含量超过40×10-6时,其红外伸缩振动吸收峰的位置向低波数方向移动0.5~1.5 cm-1。这主要是因为石英中进入晶格中的铝离子使得石英晶格的体积增大导致的。随着提纯后的脉石英中铝、铁、钛含量增加,红外特征吸收峰向低波数移动。(4)脉石英提纯加工后的样品中铝离子含量变化范围是7.89×10-6~173.75×10-6,随着样品中铝离子含量的增加,石英晶胞体积由112.92?3增加到113.12?3。当铝含量超过30×10-6时,随着铝含量的增加,晶格常数c0从5.405?增加到5.407?,而样品中碱金属离子的增加并没有使晶格常数a0变大。
[Abstract]:High purity quartz is the main raw material for producing monocrystalline silicon, polysilicon, quartz glass, optical fiber, solar cell, integrated circuit substrate and so on. It is regarded as an important part in photovoltaic industry and semiconductor manufacturing chain. High-purity quartz is generally selected and purified from the processing, its initial raw materials for the first, secondary natural crystal. However, crystal resources around the world are scarce and unevenly distributed, making it particularly important to find alternatives to quartz minerals. In many quartz minerals, the SiO2 content of vein quartz is above 99%, the purity is high, and the impurity is less, so it is an ideal raw material for processing high purity quartz. However, not all vein quartz can be purified and processed into high purity quartz. The chemical composition and crystal structure of vein quartz are different due to their different metallogenic geological conditions. The effect of purification processing is also different. Therefore, how to identify high-quality vein quartz has become an important research direction. In this paper, the vein quartz selected from 18 different producing areas was purified by the same method. The samples before and after purification were detected by ICP, infrared absorption spectrum and X-ray diffraction. The relationship between the chemical characteristics of veined quartz and the purification effect of high purity quartz was investigated. The main experimental results are as follows: (1) according to the ICP test results of impurity content after purification of vein quartz, the samples of 18 ore can be divided into upper, middle and third grade: the upper vein quartz, the content of SiO2 99.995; The content of SiO2 was 99.995.The content of quartz was 99.995. (2) after purification and processing, the average moles of Li Na K and Al B Fe of the upper vein quartz were 0.3558 mol and 0.5528 mol, respectively, which were 0.197 mol; smaller than that of the latter. The average moles of Li Na K and Al B Fe of medium vein quartz are 1.3784 mol and 0.8015 mol, respectively. The former is 0.5769 mol; larger than the latter. The average molar quantities of Li Na K and Al B Fe of inferior vein quartz are 3.0517 mol and 2.5535 mol, respectively, which are 0.4982 mol. (3) larger than that of the latter. When the Al content of purified vein quartz exceeds 40 脳 10 ~ (-6), The position of the infrared stretching vibration absorption peak moves to the direction of low wavenumber 0.5 ~ 1.5 cm-1.. This is mainly due to the increase in the volume of quartz lattice due to the aluminum ions entering the crystal lattice. With the increase of Al, Fe and Ti contents in vein-quartz after purification, the infrared characteristic absorption peak shifts to low wavenumber. (4) the variation range of Al ~ (2 +) content is 7.89 脳 10 ~ (-6) (173.75 脳 10 ~ (-6). With the increase of Al ~ (2 +) content in the sample, the volume of quartz cell increases from 112.92 ~ (2 +) to 113.12 ~ (2 +) ~ (3). When the aluminum content exceeds 30 脳 10 ~ (-6), with the increase of aluminum content, the lattice constant c _ 0 is from 5.405? The lattice constant a _ 0 was not increased with the increase of alkali ions in the sample.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O74;O613.72
[Abstract]:High purity quartz is the main raw material for producing monocrystalline silicon, polysilicon, quartz glass, optical fiber, solar cell, integrated circuit substrate and so on. It is regarded as an important part in photovoltaic industry and semiconductor manufacturing chain. High-purity quartz is generally selected and purified from the processing, its initial raw materials for the first, secondary natural crystal. However, crystal resources around the world are scarce and unevenly distributed, making it particularly important to find alternatives to quartz minerals. In many quartz minerals, the SiO2 content of vein quartz is above 99%, the purity is high, and the impurity is less, so it is an ideal raw material for processing high purity quartz. However, not all vein quartz can be purified and processed into high purity quartz. The chemical composition and crystal structure of vein quartz are different due to their different metallogenic geological conditions. The effect of purification processing is also different. Therefore, how to identify high-quality vein quartz has become an important research direction. In this paper, the vein quartz selected from 18 different producing areas was purified by the same method. The samples before and after purification were detected by ICP, infrared absorption spectrum and X-ray diffraction. The relationship between the chemical characteristics of veined quartz and the purification effect of high purity quartz was investigated. The main experimental results are as follows: (1) according to the ICP test results of impurity content after purification of vein quartz, the samples of 18 ore can be divided into upper, middle and third grade: the upper vein quartz, the content of SiO2 99.995; The content of SiO2 was 99.995.The content of quartz was 99.995. (2) after purification and processing, the average moles of Li Na K and Al B Fe of the upper vein quartz were 0.3558 mol and 0.5528 mol, respectively, which were 0.197 mol; smaller than that of the latter. The average moles of Li Na K and Al B Fe of medium vein quartz are 1.3784 mol and 0.8015 mol, respectively. The former is 0.5769 mol; larger than the latter. The average molar quantities of Li Na K and Al B Fe of inferior vein quartz are 3.0517 mol and 2.5535 mol, respectively, which are 0.4982 mol. (3) larger than that of the latter. When the Al content of purified vein quartz exceeds 40 脳 10 ~ (-6), The position of the infrared stretching vibration absorption peak moves to the direction of low wavenumber 0.5 ~ 1.5 cm-1.. This is mainly due to the increase in the volume of quartz lattice due to the aluminum ions entering the crystal lattice. With the increase of Al, Fe and Ti contents in vein-quartz after purification, the infrared characteristic absorption peak shifts to low wavenumber. (4) the variation range of Al ~ (2 +) content is 7.89 脳 10 ~ (-6) (173.75 脳 10 ~ (-6). With the increase of Al ~ (2 +) content in the sample, the volume of quartz cell increases from 112.92 ~ (2 +) to 113.12 ~ (2 +) ~ (3). When the aluminum content exceeds 30 脳 10 ~ (-6), with the increase of aluminum content, the lattice constant c _ 0 is from 5.405? The lattice constant a _ 0 was not increased with the increase of alkali ions in the sample.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O74;O613.72
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