發(fā)布時(shí)間：2018-11-12 18:24

【摘要】：高純石英是生產(chǎn)單晶硅、多晶硅、石英玻璃、光纖、太陽(yáng)能電池、集成電路基板等高性能材料的主要原料,在光伏產(chǎn)業(yè)和半導(dǎo)體制造鏈中被視為一個(gè)重要的組成部分。高純石英一般都是經(jīng)過(guò)精選和提純加工而成,其最初的原料為一、二級(jí)天然水晶。然而全世界水晶資源稀缺,且分布不均,尋找其他石英礦物替代物就變得尤為重要。在眾多石英礦物中,脈石英的SiO2含量一般在99%以上,純度高,雜質(zhì)少,是加工高純石英的理想原料。但是,并非所有脈石英都能提純加工為高純度的高純石英,由于不同產(chǎn)地的脈石英其成礦地質(zhì)條件有所不同,導(dǎo)致其化學(xué)成分和晶體結(jié)構(gòu)有所不同,對(duì)于提純加工的效果也不相同。因此,如何識(shí)別優(yōu)質(zhì)的脈石英成為重要的研究方向。本文采用同一種提純加工方法對(duì)選自18個(gè)不同產(chǎn)地的脈石英進(jìn)行提純,然后對(duì)提純加工前后的樣品進(jìn)行ICP檢測(cè),紅外吸收光譜分析,X射線衍射分析,并對(duì)脈石英晶體化學(xué)特征與其高純石英提純效果的關(guān)系進(jìn)行了探究。其主要的實(shí)驗(yàn)結(jié)果如下:(1)根據(jù)脈石英提純后雜質(zhì)含量的ICP檢測(cè)結(jié)果,可將18原礦樣品分為上、中、下三等:上等脈石英,SiO2含量99.995%;中等脈石英,SiO2的含量為99.99%~99.995%;下等脈石英,SiO2的含量99.99%。(2)提純加工后,上等脈石英的Li+Na+K和Al+B+Fe平均摩爾量分別為0.3558 mol和0.5528 mol,前者比后者小0.197 mol;中等脈石英的Li+Na+K和Al+B+Fe平均摩爾量分別為1.3784 mol和0.8015 mol,前者比后者大0.5769 mol;下等脈石英的Li+Na+K和Al+B+Fe平均摩爾量分別為3.0517 mol和2.5535 mol,前者比后者大0.4982 mol。(3)當(dāng)提純后的脈石英中鋁含量超過(guò)40×10-6時(shí),其紅外伸縮振動(dòng)吸收峰的位置向低波數(shù)方向移動(dòng)0.5~1.5 cm-1。這主要是因?yàn)槭⒅羞M(jìn)入晶格中的鋁離子使得石英晶格的體積增大導(dǎo)致的。隨著提純后的脈石英中鋁、鐵、鈦含量增加,紅外特征吸收峰向低波數(shù)移動(dòng)。(4)脈石英提純加工后的樣品中鋁離子含量變化范圍是7.89×10-6~173.75×10-6,隨著樣品中鋁離子含量的增加,石英晶胞體積由112.92?3增加到113.12?3。當(dāng)鋁含量超過(guò)30×10-6時(shí),隨著鋁含量的增加,晶格常數(shù)c0從5.405?增加到5.407?,而樣品中堿金屬離子的增加并沒(méi)有使晶格常數(shù)a0變大。
[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.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O74;O613.72

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