电感耦合等离子体质谱(ICP-MS)法测定离子吸附型稀土矿中的浸出稀土元素

Determination of Leaching Rare Earth Elements in Ion Adsorption Type Rare Earth Ore by ICP-MS

对浙江某地大量的离子吸附型稀土样品进行了稀土元素（Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu）的浸提和测定实验,实验对比了氯化铵和硫酸铵溶液对矿石中稀土元素的浸出性能,选择了杂质浸出较少的硫酸铵溶液作为浸出剂,对不同稀土含量的吸附型稀土矿进行了实验,浸出方法稳定,符合工业开采要求。实验了电感耦合等离子体质谱法测定浸出液中稀土元素分量的方法,浸出液经大比例稀释并酸化后测定,精密度较好,能满足离子吸附型稀土矿评价的质量要求,方法检出限（6σ）0.005~0.26μg/g,单元素测定精密度（n=6,RSD≤6.0%）,浸出稀土元素总量测定RSD≤4.0%。实际样品的实验及测定结果满意。

Rare earth elements（REEs）（Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb and Lu）samples in a large amount of ion adsorption type rare earth ore samples in Zhejiang province were leached and determined.After REEs leaching performance of ammonium chloride solution was compared with that of ammonium sulfate solution,ammonium sulfate was chosen as the leaching agent owing to fewer impurities.Besides,the ion adsorption type rare earth ore samples with different REEs contents were also tested.The results showed that the leaching method is stable and can meet the requirements of industrial exploitation.Thus,a new method was put forward to determine REEs components in leaching solution by inductively coupled plasma-mass spectrometry（ICP-MS）.The contents of REEs was measured after the leaching solution was diluted in large proportion and acidized.The proposed method has high precision and can satisfy the quality demands of ionadsorptive REEs evaluation in ores.The detection limits（6σ）were 0.005 ~ 0.26μg/g.The relative standard deviations（RSDs,n=6）for single element content and total elements contents were less than 6.0%and 4.0%,respectively.The method was applied to the determination of REEs in real samples in ion adsorption type rare earth ore with satisfactory results.