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| Current status of research on soil and groundwater contamination by ammonium sulfate leaching of ionic rare earth ores |
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Received:June 01, 2021
Revised:June 09, 2021
Accepted:June 10, 2021
Published Online:August 18, 2021
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| DOI： |
| KeyWord:ionic rare earth ore; Ammonium sulfate; In-situ leaching; Soil and water pollution |
| Author | Institution |
| Zhang Pei |
Kunming University of Science and Technology |
| Xiehaiyun |
Kunming University of Science and Technology |
| Caoguangzhu |
Kunming University of Science and Technology |
| Jinyanling |
Kunming University of Science and Technology |
| Liu Yanhao |
Kunming University of Science and Technology |
| Sunrui |
Kunming University of Science and Technology |
| Fengyanhu |
Kunming University of Science and Technology |
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| Abstract: |
| Most of the ionic rare earth ores in China are enriched by ammonium sulfate in-situ leaching process, which can cause pollution to both soil and groundwater. According to the mechanism and process status of ammonium sulfate in-situ leaching of rare earth ores, the ammonia-nitrogen pollution, heavy metal pollution, rare earth element pollution and acidification caused to the soil and groundwater environment during the leaching process were analyzed. The migration and transformation paths of NH4+, SO42-, H+, heavy metal ions, rare earth ions and other pollutants produced in the leaching ore in soil and groundwater were summarized. Each pollutant enters the soil and groundwater with the leachate through percolation, and in this process some NH4+ is oxidized to NO2- and NO3-, SO42- is reduced to S2- and reacts with Ca2+ to form CaSO4. |
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