含稀土高岭土精矿回收离子相稀土工艺研究

高岭土精矿具有粒度细、黏度大、渗透性能差、固液分离难、含铝高等特点，南方高岭土常伴有稀土，怎样从精矿中提取合格的稀土，目前国内外还没有一套成熟的工艺技术应用于工业生产上。依据高岭土矿中的稀土赋存特点，通过实验室小试、扩试和工业试验，探索出了一套成熟的工艺技术流程，把浸矿液与高岭土精矿加入到捣浆池中进行搅拌浸取，将矿浆通过板框压滤机压滤，得到的滤饼即是提取稀土后的高岭土精矿，滤液经后续处理即得到稀土产品。同时建成了生产线，已生产稀土10余t，为回收高岭土精矿中的离子型稀土提供了有效工艺。

Recovery of ionic type rare earth from kaolin concentrate

Kaolin concentrate has the characteristics of fine grain size, high viscosity, higher permeability and poor performance of solid-liquid separation, and high aluminum content. Southern kaolin is often accompanied by rare earth. There is not a set of mature technology applied in the industrial production to solve how to extract qualified rare earth from kaolin concentrate at present. Based on the characteristics of rare earth in kaolin ore, researchers had explored a set of mature technology process and the completion of the production line to provide technical support for the recovery of ionic rare earth in kaolin concentrate by the laboratory test, expansion test and industrial test. Both the leaching liquid and kaolin concentrate were added to the pulp pool for stirring and leaching, to obtain the filter cake when the pulp was being filter pressed by plate and frame filter, which was the kaolin concentrate. The filtrate was the rare earth products when it was subsequently treated. At the same time, the production line had been completed, and had produced more than 10 tons of rare earth, which provided an effective technique for recovering ionic rare earth in kaolin concentrate.