高纯氧化铝中痕量杂质元素的标准分析方法研究

【作者】 游玉萍；

【导师】 任凤莲； 张树朝；

【作者基本信息】 中南大学 ， 分析化学， 2005， 硕士

【摘要】 近年来,高纯氧化铝由于其良好的机械性能、热学和化学性能,被广泛用于制作透明陶瓷材料、单晶材料和稀土荧光材料等,但是高纯氧化铝的纯度直接影响其产品的微观结构与性能,因此对高纯氧化铝中杂质元素的检测与控制十分重要。我国虽然在十多年前就已经开始工业化生产高纯氧化铝,由于没有相应的行业分析标准和国家分析标准,使得高纯氧化铝的质量检测实施难度较大。随着科学技术的发展,高纯氧化铝的需求量愈来愈大,对其纯度的要求也越来越高,因此研究和制定高纯氧化铝中杂质元素的分析方法迫在眉睫。 高纯氧化铝属于难溶的无机材料之一,在样品的预处理中,我们采用了微波消解溶样技术分解试样,此溶样技术与常规的碳酸钠/硼砂碱熔样法相比,大大降低试剂空白,避免了痕量元素的挥发,同时节省了时间。 分光光度计因设备简单、操作方便、测量准确等优点在冶金分析中占有相当重要的地位。萃取法作为痕量元素分离、富集的一种有效手段,与光度法分析相结合在高纯物质的分析中,效果很好。因此,我们采用萃取光度法分别测定了高纯氧化铝中Fe₂O₃、SiO₂含量,建立了Fe₂O₃、SiO₂的化学分析方法。 电感耦合等离子体原子发射光谱（ICP-AES）由于检测限低、分析速度快、灵敏度高等优点在痕量元素的直接测定中有着广泛的用途。因此,我们对高纯氧化铝中杂质元素的ICP-AES分析方法进行了研究和探讨,建立了高纯氧化铝中Fe、Si、Ca、Na四元素的仪器分析方法。更多还原

【Abstract】 Recently, high-purity aluminum oxide has been widely used as translucent ceramic materials, single crystal materials and rare earth fluorescent materials because of its mechanical, thermal, chemical properties. Since the purity of the high-purity aluminum oxide can significantly affect the resultant microstructure, and thus the quality of the products, it is very important to determine and control the content of impurities in aluminum oxide. Though high-purity aluminum oxide was brought about ten years ago in our country, it is still difficult to determine the impurities because there are no corresponding standards of industry and nation. With the development of science and technology, high-purity aluminum oxide will be in great demand, and higher purification will be required as well. Therefore, it is very urgent to establish a series of analytical method for determining impurities in aluminum oxide.High-purity aluminum oxide is one of the hardest melting materials. Microwave-assisted acid dissolution of high-purity aluminum oxide has been developed for pretreatment in specimen, which decreases blank value, avoids of volatilization of trace element, and saves time, compared with traditional fusion with sodium carbonate/boric acid.Spectrophotometer plays an important role in metallurgical analysis because of its simpleness, convenience and nicety. And extraction, as an important method of separation and enrichment, which combined with spectrophotometric analysis, is very efficiency. Thus two methods to respectively determine Fe₂O₃ 、 SiO₂ in high-purity aluminum oxide by extractive spectrophotometry have been developed.Inductively coupled plasma atomic emission spectrometry （ICP-AES） has become a comprehensive method in the trace component analysis, because of low detection limits, rapid analysis and good sensitivity. In this work, a method has been investigated by ICP-AES for analyzing impurities in High-purity aluminum oxide. In the total, a method only for Fe、 Si、 Ca、 Na has been established.更多还原