离子型稀土矿山淋洗及尾水富集试验研究

对浸矿后离子型稀土原地浸矿场采用清水进行淋洗，在184天的清水淋洗过程中，尾水氨氮值从最开始的507mg/L，降低至140mg/L，淋洗尾水pH4.52~3.10。淋洗尾水采用两级反渗透膜分离，既回收有价资源稀土，又能使出水氨氮达标。结果表明，产水氨氮浓度稳定低于15mg/L，对稀土的截留率高于98.25%，浓水中稀土离子平均浓度313.4mg/L，可进一步回收稀土资源。

Experimental Study on Leaching and Leached Water Enrichment in Ionic Rare Earth

Leaching on the finished in-situ leaching field of ionic rare earth with clean water, during the 184-day leaching process, the ammonia nitrogen content of the leached water could be from 507mg/L to 140mg/L. The pH of the tail water could be 4.52~3.10. The leached water was separated by two-stage RO progress, which not only recovers valuable rare earth resources, but also makes the ammonia nitrogen of effluent is better than the relevant discharge standard. The results show that, the ammonia nitrogen concentration of effluent could be reduced to to below 15mg/L after treating, the rejection rate of rare earth is higher than 98.25%, the average rare earth ion content of concentrated water was 313.4mg/L.