Affinity of Rare Earth Elements to Silico-Phosphate Phases in the System Al2O3-CaO-MgO-P2O5-SiO2
Affinity of Rare Earth Elements to Silico-Phosphate Phases in the System Al2O3-CaO-MgO-P2O5-SiO2
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DOI：
10.1002/cite.201300168
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发表时间：
2014-06-01
影响因子：
1.9
通讯作者：
Strauss, Karl
中科院分区：
文献类型：
--
作者：
Elwert, Tobias;Goldmann, Daniel;Strauss, Karl
在Al_2O_3-CaO-MgO-P_2O_5-SiO_2渣系中研究了Nd和Dy对含磷矿物相的亲合性。炉渣来源于NdFeB磁体的火法回收。在不添加磷酸盐的情况下，Nd和Dy在硅酸盐基质中的分布或多或少是任意的。添加磷酸盐导致在结晶过程的早期阶段形成硅磷酸盐，其清除大部分Nd和Dy。这是由于这些元素对磷酸盐结构的强亲和力。这一现象可用于经典矿物浮选法生产稀土精矿。
The affinity of Nd and Dy to phosphate containing mineral phases was investigated in this study in an Al2O3-CaO-MgO-P2O5-SiO2 slag system. The slags originate from pyrometallurgical recycling of NdFeB magnets. Without addition of phosphate, the distribution of Nd and Dy is more or less arbitrary in the silicate matrix. Addition of phosphate leads to the formation of a silico-phosphate in an early stage of the crystallization process, which scavenges the majority of Nd and Dy. This is due to the strong affinity of these elements to phosphate structures. This phenomenon could be used to produce a rare earth element concentrate by classical mineral beneficiation.