Determination of aluminum,chromium,nickel and zinc in recycled material from rare earth molten salt electrolysis
ZHANG Xiuyan1,2, LIU Danna1,2, ZHANG Hong1,2, BAO Xiangchun*1,2
1. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou 014030, China; 2. Baotou Research Institute of Rare Earths,Baotou 014030, China
Abstract：The contents of aluminum, chromium, nickel and zinc in recycled material from rare earth molten salt electrolysis affect the regeneration process and the quality of recycled products. Therefore, the accurate determination of aluminum, chromium, nickel and zinc is of great significance for its recycling and reuse. The sample was fused in silver crucible with sodium hydroxide and sodium peroxide as flux followed by extraction with hot water and acidification with nitric acid. By selecting 27Al, 52Cr, 60Ni and 66Zn as isotopes and correcting the matrix effect with cesium internal standard, a method for determination of aluminum, chromium, nickel and zinc in recycled material from rare earth molten salt electrolysis was established by inductively coupled plasma mass spectrometry in 2% (V/V) nitric acid medium. According to the classification standards of light rare earths, medium rare earths and heavy rare earths, the representative elements including lanthanum, praseodymium, europium, dysprosium, lutetium and yttrium were selected to prepare single element matrix solutions with mass concentrations of 0, 0.025 and 0.075 mg/mL, respectively. The influence of matrix effect on the test elements and internal standard elements were investigated. The results showed that the matrix effect was not significant within the range of matrix mass concentration tested, and the matrix effect on internal standards (rhodium and cesium) and the test elements were basically the same. 10.00 ng/mL cesium was selected as the internal standard, and the mass concentration of matrix was controlled at 0.060 mg/mL. It was shown that the correlation coefficients of calibration curves were all above 0.999 5. The limits of detection were in range of 0.099-0.81 ng/mL, and the limits of quantitation were in range of 0.33-2.70 ng/mL. The contents of aluminum, chromium, nickel and zinc in recycled materials from rare earth molten salt electrolysis such as holmium iron and lanthanum cerium were determined according to the experimental method. The results were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The relative standard deviations (RSD, n=11) were between 4.2% and 8.4%, and the recoveries were between 96% and 112%.
张秀艳, 刘丹娜, 张红, 包香春. 电感耦合等离子体质谱法测定稀土熔盐电解回收料中铝铬镍锌[J]. 冶金分析, 2022, 42(9): 68-74.
ZHANG Xiuyan, LIU Danna, ZHANG Hong, BAO Xiangchun. Determination of aluminum,chromium,nickel and zinc in recycled material from rare earth molten salt electrolysis. , 2022, 42(9): 68-74.
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