超导磁选富集白云鄂博尾矿中的有价元素研究

白云鄂博矿选矿厂的综合尾矿REO、Nb₂O₅和Sc₂O₃含量分别为2.41%、0.16%和0.22%，且含有大量的萤石。为了提高REO、Nb₂O₅和Sc₂O₃的回收率，为萤石的综合回收创造条件，采用SLon-100型周期式超导高梯度磁选机进行了REO、Nb₂O₅和Sc₂O₃回收工艺技术条件研究，并对磁选产品进行了XRD和主要化学成分分析。试验研究表明：SLon-100型周期式超导高梯度磁选机使用菱形网片聚磁介质，背景磁感应强度为6 T，给矿浓度为12%，矿浆流速为7.1 L/min，脉动冲次为100次/min情况下，可获得REO品位为3.04%、回收率为88.91%的精矿；稀土及稀有金属矿物明显富集在精矿中，这为稀土及稀有金属矿物的进一步富集创造了条件，可显著减少浮选提纯稀土及稀有金属矿物过程中萤石等脉石矿物抑制剂的使用；萤石明显富集在尾矿中，为从尾矿中浮选富集萤石创造了条件。

Study on Concentrating Valuable Elements in Bayan Obo Tailings by Superconducting Magnetic Separation

The contents of REO， Nb₂O₅ and Sc₂O₃ in the tailings of Bayan Obo Plant are 2.41%， 0.16% and 0.22% respectively， containing a large amount of fluorite. For improving the recovery of REO， Nb₂O₅ and Sc₂O₃ and creating conditions for comprehensive recovery of fluorite， the technology of REO， Nb₂O₅ and Sc₂O₃ recovery process were studied by SLon-100 periodic superconducting high gradient magnetic separator， and the XRD and main chemical components of magnetic separation products were analyzed. The experimental results show that the concentrate with REO grade of 3.04% and recovery of 88.91% can be obtained by SLon-100 periodic superconducting high gradient magnetic separator with the diamond mesh as magnetic matrices type， background magnetic induction intensity 6 T， the feeding density in slurry 12%， the slurry velocity 7.1 L/min， and pulsating 100 P/min. Rare earth and rare metal minerals are obviously enriched in concentrates， which creates conditions for further enrichment of rare earth and rare metal minerals， and significantly reduces the use of gangue mineral inhibitors in the process of flotation purification of rare earth and rare metal minerals； Fluorite is obviously enriched in tailings， creating conditions for floatation of fluorite from tailings.