ICP-AES法测定难分解钽铌矿渣中多种金属元素

Analysis of Metallic Elements in Refractory Tantalum-Niobium Slag by ICP-AES

采用ICP-AES方法测定了富锡难分解钽铌矿渣中的Ta，Nb，Sn，Ti，W，Fe，Mn，Al，Pb，Ce，Y，Sc，Pr，Sm，Nd，U，Th等17种元素的含量。样品前处理分两步进行，首先用碳酸钾一硼酸在950℃熔融15min，然后用盐酸-酒石酸在90℃浸取30min即可将样品溶解完全。分析过程中采用基体匹配的方法消除了熔融剂及锡对其他元素测定的干扰。该方法的相对标准偏差为0．27％～5．48％，加标回收率为94．0％～109．6％。通过对测定结果的分析，得出钽铌矿渣中含有丰富的Sn，Ta，Nb，Ti，W，Ce等有价金属，具有很高的综合利用价值。同时渣中还含有少量放射性元素，属放射性污染源。文章建立的分析方法，操作简单、快速并可以实现多元素同时测定，为研究难处理钽铌矿渣的综合利用提供了依据。

A new method for analysing the contents of many metalic elements, such as Ta, Nb, Sn, Ti, W, Fe, Mn, Al, Pb, Ce, Y, Sc, Pr, Sin, Nd, U, Th ete, in refractory tantalum-niobium slag by ICP-AES was developed. The samples processing procedures involve two steps, being first decomposed by potassium carbonate and boric acid at 950℃ for 15rain, then leached by hydroehloride and tartaric acid at 90℃ for 30 min. The interference of flux and tin matrix in analyzing the other elements was eliminated by the utilization of matrix matching method. This method showed satisfactory precision and accuracy with the RSDs between 0.27% and 5.48% and the recovery rates between 94.0% and 109.6%. The analysis results indicated that highly valuable metals of Sn, Ta, Nb, Ti, W and Ce are rich in the refractory tantalum-niobium slag, showing that it has the great potential for comprehensive utilization. However, the analysis result also showed that the slag is a radioactive pollution source due to a small amount of U and Th. This method is simple and fast, and has the advantage of analyzing many elements simultaneously. The accurate analytic results provided a basis for the future researches on the comprehensive utilization of refractory tantalum-niobium slag.