Analysis on slow-release of residual ammonium in ion-absorbed type rare earth tailings
XIE Fang-fang1,2, WANG Guan-shi3, LUO Si-hai3, YIN Sheng-hua4, WEN Teng3, ZHANG Shil-iang1, LIU Jian1
1. School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; 2. Mining Research Laboratory, Jiangxi Ionic Rare Earth Engineering Research Co., Ltd., Ganzhou 341000, China; 3. Jiangxi Key Laboratory of Environmental Geotechnology and Engineering Disaster Control, Ganzhou 341000, China; 4. Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, China
Abstract：In order to explore the slow-release of residual NH4+, ion-absorbed type rare earth ore from Xinfeng (Jiangxi Province) was taken as the research object. The leached tailings were prepared by column leaching, and then drip washing with deionized water. Follow the steps of drip washing → sealing and storing → re drip washing, NH4+ amount in drip washed tailings with different water content (1.3%, 15%, 35%, 250%), under different time (15, 30, 60, 120, 180, 195, 210, 240d), different mass transfer mechanisms (convection, diffusion) were investigated. The results show that NH4+ can still be washed out from the drip washed tailings after being sealed and preserved for a long time. NH4+ washing amount is affected by water content, time and mass transfer mechanism. NH4+ washing amount, as a whole, increase with time proceeding, when the water content is ≥15%, and increase with the increase of water content, in the same preserved time. When other conditions are the same, NH4+ washing amount under convective is greater than diffusion. NH4+ re-washed out from the tailings is the result of transformation of NH4+ from exchangeable to water-soluble.
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