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磷矿中常常伴生有稀土元素,且含量均较低,其稀土元素的含量多寡对磷矿的综合利用及研制高效稀土磷肥有着重要意义。因此必须建立能适应磷矿中全部稀土元素的分析方法。本法采用直接光谱粉末法进行测定,重点对缓冲剂进行了系统的比较和对分析线进行严格的选择。一次摄谱,操作简便。各元素的测定下限:Eu为1×10~(-4);Yb和La为5×10~(-4);Nd、Ho和Er为1×10~(-3);Ce、Sm、Gd、Tb、Dy及Tm为3×10~(-3);Pr和Lu为5×10~(-3)。单次测定变异系数为4—13%。方法简便快速,精密度完全满足地质选矿试样的要求。在混合稀土和单一稀土氧化物的分析中,前人多采用单一卤化物或钾、钠等化合物与纯碳粉混合为缓冲剂。本文采用混合缓冲剂(氯化铯、溴化钾与碳粉混合),在实验中对单一的和混合的缓冲剂均做了较系统的比较结果,结果见表1。
Phosphate rock is often accompanied by rare earth elements, and the content is low, the amount of its rare earth elements for the comprehensive utilization of phosphate rock and the development of high-efficiency rare earth phosphate is of great significance. Therefore, we must establish an analytical method that can adapt to all rare earth elements in phosphate rock. This method uses the direct spectroscopic powder method for determination, focusing on the buffer system comparison and analysis of the line of strict selection. A photo, easy to operate. The lower limit of determination of each element: Eu is 1 × 10 -4; Yb and La are 5 × 10 -4; Nd, Ho and Er are 1 × 10 -3; Ce, Sm, Gd , Tb, Dy and Tm are 3 × 10 -3, Pr and Lu are 5 × 10 -3. The single coefficient of variation was 4-13%. The method is simple and fast, and the precision meets the requirements of geological dressing samples completely. In the analysis of mixed rare earths and single rare earth oxides, many people used single halide or potassium, sodium and other compounds mixed with pure carbon powder as a buffer. In this paper, a mixed buffer (cesium chloride, potassium bromide and carbon powder mixture), in the experiment on a single and mixed buffer were made more systematic comparison results, the results in Table 1.