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《Light Metals》 2019-11
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Improvement of spectrophotometric method for the determination of trace silicon in high purity alumina

Wang Zhenyue;Han Fenglan;Kang Sen;Chang Hui;Teng Bin;School of Materials Science and Engineering, North Minzu University;International Scientific and Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials;Collaborative Innovation Center for High Value Utilization of Industrial By-products;TDG Yinxia New Material Co.,Ltd.;  
Silicon content in alumina was determined by molybdenum blue method.Alumina powder was dissolved with sulfuric acid(1+5.5) as solvent. Ammonium molybdate was complexed with silicon as colorant, and then reduced by L-ascorbic acid, and added with 2.0 ml citric acid. The siliconcontent was measured in a 3 cm cupel at the wavelength of 815 nm. In 50 ml system, the linear relationship between silicon content and absorbance is good when the content is less than 20 μg, and the correlation coefficient of r~2 is 0.99696. The content of Trace Silicon in alumina is successfully determined by this method. The detection range is 0.64~15 μg/g, the standard deviation is less than 8%, and the standard recoveryrate is from 93% to 105%. This method is used to detect high purity aluminium trioxide powder with low cost and high precision. Its popularization is of great significance to sapphire production.
【Fund】: 大尺寸蓝宝石晶体品质控制技术研究(宁夏回族自治区科技攻关计划)项目编号:2018BDE13005
【CateGory Index】: O657.3;TQ133.1
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