Determination of chromium, niobium, molybdenum, tungsten, tin in iron ore by inductively coupled plasma atomic emission spectrometry with alkali fusion
YANG Xin-neng1, CHEN De2, LI Xiao-qing1
1. Manufacturing Department of Panzhihua Steel & Vanadium Co., Ltd.,Panzhihua 617000,China; 2. Manufacturing Department of Xichang Steel & Vanadium Co., Ltd., Xichang 615000, China
Abstract：The accurate and rapid determination of microelements in iron ore had very important significance for the quality improvement of steel and vanadium products. For the elements which were hardly dissolved with acid including chromium, niobium, molybdenum, tungsten and tin, the selection of proper sample pretreatment method and the determination method of inductively coupled plasma atomic emission spectrometry (ICP-AES) were helpful to improve the accuracy and efficiency for determination. The sample was melted at high temperature with lithium carbonate-boric acid mixed flux followed by leaching and acidification with hydrochloric acid. Cr 267.716nm, Nb 269.706nm, Mo 202.030nm, W 224.875nm and Sn 189.989nm were selected as the analytical lines. The calibration curves were prepared by matrix matching method to eliminate the influence of matrix effect. The contents of chromium, niobium, molybdenum, tungsten and tin in iron ore were determined by ICP-AES. The linear correlation coefficients of calibration curves of elements were all not less than 0.9996. The detection limits of method were in range of 0.002%-0.003%. The proposed method was applied for the determination of chromium, niobium, molybdenum, tungsten and tin in actual sample of iron ore. The relative standard deviations (RSD, n=9) of results were between 1.0% and 3.8%, and the recoveries were between 94% and 105%. The contents of chromium, niobium, molybdenum, tungsten and tin in four iron ore samples were determined according to the experimental method. There results were consistent with those obtained by other chemical analysis methods (spectrometric determination for chromium, niobium and tin, and inductively coupled plasma mass spectrometric determination for tungsten and molybdenum).
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YANG Xin-neng, CHEN De, LI Xiao-qing. Determination of chromium, niobium, molybdenum, tungsten, tin in iron ore by inductively coupled plasma atomic emission spectrometry with alkali fusion. , 2019, 39(12): 55-60.
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