Determination of silicon dioxide in iron ore with high content silicon by gravimetric method combined with inductively coupled plasma atomic emission spectrometry
XUAN Jianwen, HE Yingxian, LIN Qixuan, XIAO Dahui*
Technology Center of Guangzhou Customs,Guangzhou 510623,China
Abstract：During the determination of silicon dioxide in iron ore with high content silicon by gravimetric method specified in standard GB/T 6730.10-2014, the high-temperature dehydration and filtration should be repeated to recover the soluble silicon in solution. As a result, the detection time is usually long. In order to shorten the detection time, the content of silicon dioxide in iron ore with high content silicon was determined by gravimetric method combined with inductively coupled plasma atomic emission spectrometry (ICP-AES). The iron ore sample with high content silicon was treated by acid dissolution, and the silicon-containing precipitates were treated by alkali fusion and acidification. Most silicon in sample was converted to silicic acid. After high-temperature dehydration, the generated silicon dioxide could react with hydrofluoric acid to form silicon tetrafluoride gas. The content of silicon could be calculated by the weight loss. Meanwhile, a little amount of silicon dissolved in the filtrate was determined by ICP-AES. The content of silicon dioxide in sample was the total silicon contents by gravimetric method and ICP-AES. The contents of silicon dioxide in two iron ore samples were determined according to the experimental method. It was found that the proportion of soluble silicon in the filtrate ranged from 0.39% to 2.0%. The proposed method was applied for the determination of silicon dioxide in three certified reference materials and seven international proficiency test samples of iron ore (the mass fraction of silicon dioxide was in range of 9.595%-50.01%). The found results were consistent with the certified values/reference values. The repeatability of the results could meet the requirements in GB/T 6730.10-2014.
禤健文, 何颖贤, 林琦渲, 萧达辉. 重量法-电感耦合等离子体原子发射光谱法联用测定高硅铁矿中二氧化硅[J]. 冶金分析, 2023, 43(2): 59-64.
XUAN Jianwen, HE Yingxian, LIN Qixuan, XIAO Dahui. Determination of silicon dioxide in iron ore with high content silicon by gravimetric method combined with inductively coupled plasma atomic emission spectrometry. , 2023, 43(2): 59-64.
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