Determination of yttrium in yttrium-aluminum alloy byoxalate gravimetry and inductively coupled plasmaatomic emission spectrometry
LIU Chun1,2, ZHANG Hui-zhen1,2, ZHANG Yi-ming1,2, LIU Xiao-jie1,2, XING Rong-rong1,2
1. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, BaotouResearch Institute of Rare Earths, Baotou 014030, China; 2. Rui Ke National Engineering Research Centre ofRare Earth Metallurge and Function Materials Co., Ltd., Baotou 014030, China
Abstract：The yttrium in the yttrium-aluminum alloy can significantly improve the castability and creep resistance of alloy. Therefore, the accurate determination of yttrium content in the yttrium-aluminum alloy is of great significance for the development of high-performance aluminum alloy materials. The yttrium-aluminum alloy sample was decomposed with sodium hydroxide solution. After separation of aluminum by filtration, the yttrium hydroxide precipitate was dissolved with hydrochloric acid. Then yttrium was precipitated with oxalic acid at pH 1.8-2.0. After ageing, filtration and washing, the precipitate was calcined at 950℃ until the weight was constant. The content of yttrium in precipitate was calculated. The filtrate was treated by nitric acid and perchloric acid, and the content of yttrium in filtrate was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The sum of two experiments was the content of yttrium in the yttrium-aluminum alloy. The experiment results showed that yttrium and aluminum could be effectively separated by decomposing the sample with sodium hydroxide solution followed by filtration. Then, the pH of filtrate was appropriately adjusted for the precipitation and filtration of yttrium with oxalic acid, realizing the separation of yttrium from other coexisting elements. The residual coexisting elements in precipitate had no interference with the gravimetric determination of yttrium. The coexisting elements in filtrate had no interference with the determination of yttrium (lost in precipitation separation process) by ICP-AES. The proposed method was applied for the determination of yttrium in two yttrium-aluminum alloy samples. The relative standard deviations (RSD, n=10) of determination results were between 0.49% and 0.78%. The spiked recovery tests of yttrium in one yttrium-aluminum alloy sample were conducted according to the experimental method. The recoveries were between 100% and 101%. Meanwhile, the content of yttrium in yttrium-aluminum alloy sample was also determined by alkali dissolution-EDTA titrimetry, and the results were basically consistent with those obtained by the experimental method.
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