Technological Study on High-efficiency Leaching and Removal of Ammonia Nitrogen with Magnesium Sulfate from Ionic Rare Earth Tailings AITranslate
Abstract AITranslate
In view of the long-term tailing problem caused by residual ammonia nitrogen in ionic rare earth tailings in southern Jiangxi,indoor column leaching was carried out to simulate the environment of mining area,and then ammonium was removed by centralized leaching with leaching agents.Researches on lea-ching agent screening,leaching process optimization,leaching effect verification and residual leaching agent removal from tailings were carried out.The results show that magnesium sulfate is a suitable agent for the leaching of ammonia nitrogen from the ionic rare earth tailings in southern Jiangxi.When the concentration of magnesium sulfate solution reaches 2.5%(mass fraction),pH value is 5,and the injection strength is 0.3 mL/min,the leaching effect is relatively better,and the leaching rate of ammonia nitrogen from the tailings reaches 96.97%with the leaching liquid-solid ratio of 2.9.After the tailings leached by magnesium sulfate are immersed in the rainwater with pH value of 5.7 for 60 days,the concentration of ammonia nitrogen in the leachate is lower than the direct emission standard of 15 mg/L.Adding top water to the tai-lings after centralized leaching can leach down the residual magnesium ions in the tailings for recycling,which will not cause secondary pollution to the mining area of ionic rare earth tailings.
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DOI：
Chinese Library Classification Number:X758[环境科学与工程—环境工程]
Citation Information:
In view of the long-term tailing problem caused by residual ammonia nitrogen in ionic rare earth tailings in southern Jiangxi,indoor column leaching was carried out to simulate the environment of mining area,and then ammonium was removed by centralized leaching with leaching agents.Researches on lea-ching agent screening,leaching process optimization,leaching effect verification and residual leaching agent removal from tailings were carried out.The results show that magnesium sulfate is a suitable agent for the leaching of ammonia nitrogen from the ionic rare earth tailings in southern Jiangxi.When the concentration of magnesium sulfate solution reaches 2.5%(mass fraction),pH value is 5,and the injection strength is 0.3 mL/min,the leaching effect is relatively better,and the leaching rate of ammonia nitrogen from the tailings reaches 96.97%with the leaching liquid-solid ratio of 2.9.After the tailings leached by magnesium sulfate are immersed in the rainwater with pH value of 5.7 for 60 days,the concentration of ammonia nitrogen in the leachate is lower than the direct emission standard of 15 mg/L.Adding top water to the tai-lings after centralized leaching can leach down the residual magnesium ions in the tailings for recycling,which will not cause secondary pollution to the mining area of ionic rare earth tailings.
quote
| GB/T 7714-2015 | [1] XIAO Xin-jin, WANG Hui-juan, HUANG Jin, et al. Technological Study on High-efficiency Leaching and Removal of Ammonia Nitrogen with Magnesium Sulfate from Ionic Rare Earth Tailings[J]. Rare Metals and Cemented Carbides, 2022(5): 5-11. |
| MLA | [1] XIAO Xin-jin, et al., "Technological Study on High-efficiency Leaching and Removal of Ammonia Nitrogen with Magnesium Sulfate from Ionic Rare Earth Tailings." Rare Metals and Cemented Carbides, no. 5, 2022, pp. 5-11. |
| APA | [1] XIAO Xin-jin, WANG Hui-juan, HUANG Jin, DENG Yang-wu, XIE Fang-fang, & WANG Lin-sheng. (2022). Technological Study on High-efficiency Leaching and Removal of Ammonia Nitrogen with Magnesium Sulfate from Ionic Rare Earth Tailings. Rare Metals and Cemented Carbides(5), 5-11. |
| IEEE | [1] XIAO Xin-jin, WANG Hui-juan, HUANG Jin, DENG Yang-wu, XIE Fang-fang, and WANG Lin-sheng, "Technological Study on High-efficiency Leaching and Removal of Ammonia Nitrogen with Magnesium Sulfate from Ionic Rare Earth Tailings," Rare Metals and Cemented Carbides, no. 5, pp. 5-11, 2022. keywords: {ionic rare earth tailing;ammonia nitrogen;magnesium sulfate;leaching;ammonium removal;magnesium removal} |