ICP-AES法测定氟碳铈矿中低含量稀土总量

Determination of low content total rare earth in bastnaesite by ICP-AES

  • 摘要: 采用电感耦合等离子体发射光谱法测定四川氟碳铈矿选矿过程中伴生的中低含量稀土总量,试验对熔融条件、样品处理和共存离子干扰等方面进行考察,探讨方法的准确性和精密度.试验表 明,经过氧化钠碱融浸取、氨水沉淀后的稀土用硝酸和高氯酸破坏滤纸重新分解效果较好,相对标准 偏差(RSD小于3%,回收率达95%-105%,且矿中其他杂质元素对测定结果无明显干扰;此外还进 行ICP-AES法、重量法、X射线荧光法方法对试验,测定结果无显著性差异.实验表明,方法精密 度好、准确度高、操作简便,可适用于四川氟碳铈矿选矿过程中低含量稀土的日常分析.

     

    Abstract: The determination of low content total rare earth in bastnaesite during dressing processes was determined by the inductively coupled plasma atomic emission spectrometry method. Tests were made on the fusion condition, sample treatment and the interference of co-existing ions to investigate veracity and precision of the method. After alkali melt decomposition, the rare earth precipitate are precipitated and separated by ammonia, thus recoveries of standard addition can reach 95 %-105 % with RSD less than 3 %, and without obvious interferences by impurity elements. In addition, ICP-AES, gravimetric analysis and X-ray fluorescence comparison test were carried out to find no significant difference. The results show that the method is highly accurate and precise, and can be applied for routine analysis of low content total rare earth during bastnaesite dressing processes.

     

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