微色谱柱分离分光光度法连续测定包头稀土精矿中铈组稀土和钍

来源期刊：冶金分析2010年第8期

论文作者：罗明标 郭国龙 徐晶晶 花榕 孙玉珍 张麟熹

文章页码：45 - 49

关键词：阳离子交换树脂； 微色谱柱； 稀土精矿； 钍； 铈组稀土

Key words：cation exchange resins； chromatographic micro-column； rare earth concentrate； thorium； cerium-group rare earth

摘    要：通过阳离子交换树脂微色谱柱分离,建立了分光光度法连续测定稀土精矿中铈组稀土和钍的方法。含大量稀土元素和钍的1 mol/L HCl试液流经HD-8阳离子交换树脂微色谱柱,钍和稀土同时被保留在树脂上,用1 mol/L HCl淋洗杂质元素,4 mol/L HCl-2 mol/LNH₄Cl洗脱液洗脱稀土,然后柱子用200 g/L NH₄Cl溶液转型,水洗去多余的铵根离子,40g/L草酸铵溶液洗脱保留在柱子上的钍。从柱子洗脱下来的稀土和钍以偶氮胂Ⅲ作显色剂光度法分别测定。该法用于测定包头稀土精矿中铈组稀土和钍,相对标准偏差(RSD)分别为0.24%和2.7%。

Abstract: A method for the continuous spectrophotometric determination of the cerium-group rare earth elements and thorium in Baotou rare earth concentrate was established by using cation exchange resins chromatographic micro column separation method.Thorium and rare earth elements were retained in the HD-8 cation exchange resins chromatographic micro-column when 1 mol/L HCl test solution containing large amounts of rare earth elements and thorium passed through the column.The column were washed by 1 mol/LHCl solution to elute impurity elements.Rare earth elements were eluted with 4 mol /L HCl-2 mol /L NH₄Cl solution.Then,the column was restructured with 200 g/L NH₄Cl solution and washed with water.Thorium was eluted with 40 g/L ammonium oxalate solution.The rare earth elements and thorium eluted from the column were determined by spectrophotometry with arsenazo Ⅲ as chromogenic reagent.The RSD for the determination of cerium-group rare earth elements and thorium in Baotou rare earth concentrate are of 0.24% and 2.7%,respectively.