Determination of metallic aluminum, aluminum oxide and calcium oxide in high-aluminum high-calcium modifier by inductively coupled plasma atomic emission spectrometry
LI Jing, ZHANG Chunhua, YANG Zhongmei, CHAI Ye
HBlS Group Tangsteel Company, Tangshan 063611,China
Abstract：The accurate determination of metallic aluminum, aluminum oxide and calcium oxide in high-aluminum high-calcium modifier could guide the fine smelting, control the cost, and evaluate the material quality objectively. Since the high-aluminum high-calcium modifier was a kind of mixture of powder and crumb materials, the sample was screened with 0.125 mm sieve. The samples on the screen and under the screen were dissolved by ferric chloride solution with electromagnetic stirring, respectively. After filtration, the sample on the filter paper was ashed, melted, acidified, and diluted to the mark. The filtrate solution was directly diluted to the certain volume. Al 394.401 nm and Ca 317.933 nm were selected as the analytical line. The contents of aluminum and calcium in the solution of sample on the screen and under the screen were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). According to calibration curves, the contents of metallic aluminum, aluminum oxide and calcium oxide in sample solution of high-aluminum high-calcium modifier were calculated. The total amount of metallic aluminum, aluminum oxide and calcium oxide in sample was calculated by weighted average method. The proposed method was applied for determination of metallic aluminum, aluminum oxide and calcium oxide in high-aluminum high-calcium modifier samples, and the recovery tests was conducted. The relative standard deviations (RSD,n=8) of the determination results were between 0.25% and 6.1%. The recoveries were between 91% and 106%. The method comparison test was conducted with the proposed method and X-ray fluorescence spectrometry, and the results were consistent.
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