The Experts below are selected from a list of 50565 Experts worldwide ranked by ideXlab platform
Wen-shen Liu - One of the best experts on this subject based on the ideXlab platform.
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ReclamatIon with organic amendments and plants remodels the diversity and structure of bacterial community in Ion-adsorptIon rare earth element mine tailings
Journal of Soils and Sediments, 2020Co-Authors: Ye Liu, Wen-shen Liu, Mei-na Guo, Chang Liu, Hermine Huot, Yuanqing Chao, Xi Zhong, Yingheng Fei, Shizhong WangAbstract:The success of phytoremediatIon relies on beneficial plant-microbe interactIons. However, the changes of soil microbiota, during the phytoremediatIon of Ion-adsorptIon rare earth element (REE) mine tailings, are far from understood. The present study was conducted to reveal the co-occurrence patterns and key regulating factors of bacterial communities in Ion-adsorptIon REE mine tailings with phytoremediatIon. A field experiment was conducted on an Ion-adsorptIon REE mine tailing to test three phytoremediatIon strategies: (i) phytostabilizatIon with grasses, (ii) phytostabilizatIon with economic crops, and (iii) phytoextractIon with REE hyperaccumulators. The bacterial community diversity, co-occurrence patterns, and the key regulating environmental factors in bulk and rhizospheric soils after 16 months of reclamatIon were studied by 16S Illumina high-throughput sequencing. The soils of plots with REEs-hyperaccumulators had significantly higher α-diversity than those planted with non-accumulators. After phytoremediatIon, the diversity and relative abundances of bacteria assisting in nutrient acquisitIon pronouncedly increased in the bulk soil of the reclaimed plots. Some plant growth–promoting bacteria (PGPB), e.g., Rhodanobacter, Streptomyces, and Bacillus, were enriched in the rhizospheric soil samples. Meanwhile, soil nutrient (total carbon and total nitrogen) concentratIon and REE availability were the most significant factors shaping the bacterial communities. Furthermore, special bacterial consortia of Bacilli took up the positIons of the keystone species. The results revealed the co-occurrence patterns and key regulating factors of bacterial communities in Ion-adsorptIon REE mine tailings, which will provide more crucial informatIon for the optimizatIon of the reclamatIon of REE tailings.
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Controls on rare-earth element transport in a river impacted by Ion-adsorptIon rare-earth mining.
The Science of the total environment, 2019Co-Authors: Wen-shen Liu, Hermine Huot, Chun-mei Zhao, Meng-yuan Zheng, Yuanqing Chao, Xi Zhong, Ding Kengbo, Miaoyue Zhang, Ye-tao TangAbstract:Rare-earth elements (REEs) are known to be a group of emerging pollutants, but the geochemistry of REEs in river waters in Ion-adsorptIon rare-earth mining areas has attracted little attentIon. In this study, samples of the 90% of the acidified bulk water). Furthermore, REE patterns indicated that the REE-associated large colloids were mineral or mixed mineral-organic matter (OM) at upstream sites and OM-dominated or functIonalized at downstream sites. The particles were mainly coated by inorganic matter substances (e.g., Fe/Al oxyhydroxides). In summary, our results reveal that REE patterns provide a useful tool to study the fate of REEs in Ion-adsorptIon rare-earth mining catchments.
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Water, sediment and agricultural soil contaminatIon from an Ion-adsorptIon rare earth mining area
Chemosphere, 2019Co-Authors: Wen-shen Liu, Mei-na Guo, Chang Liu, Ming Yuan, Xin-tian Chen, Hermine Huot, Chun-mei Zhao, Ye-tao Tang, Jean-louis Morel, Rong-liang QiuAbstract:Due to their specific properties, Ion-adsorptIon rare earth mine sites may be a threat for adjacent environments. This work was undertaken to assess whether former mining operatIons on Ion-adsorptIon rare earth mine sites have a significant impact on water bodies and soils of the surrounding environments. Tailing soil materials, stream waters and sediments, and farmland soils were collected from one of the largest Ion-adsorptIon rare earth mine sites worldwide (Southern China). Total concentratIons of rare earth elements (REEs), Fe, Al, etc., and pH were measured. Results revealed high concentratIons of REEs in tailing soils (392 mg kg(-1)), stream waters (4460 mu g L-1), sediments (462 mg kg(-1)) and farmland soils (928 mg kg(-1)) in comparison with control sites. In the tailing profiles, light REEs (LREEs) were preferentially leached compared to middle REEs (MREEs) and heavy REEs (HREEs). Anomalies in tailings and stream water indicated strong soil weathering (Eu) and leaching activities (Ce) within the tailings. The MREE enriched pattern in stream water was more related to water parameters such as Al and Fe oxides, and ligands, than to the source of REEs. Anomalies also indicated that REEs contaminatIon in the farmland soils was mainly originated from the stream water contaminated by the leaching from the tailings. In conclusIon, a heavy REEs pollutIon was recorded in the surrounding environment of Ion adsorptIon rare earth mine. REEs fractIonatIon, Ce and Eu anomalies provided an insight to the understanding of REEs leaching and soil weathering processes, and REEs environmental fate in rare earth mining area.
Ye-tao Tang - One of the best experts on this subject based on the ideXlab platform.
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Controls on rare-earth element transport in a river impacted by Ion-adsorptIon rare-earth mining.
The Science of the total environment, 2019Co-Authors: Wen-shen Liu, Hermine Huot, Chun-mei Zhao, Meng-yuan Zheng, Yuanqing Chao, Xi Zhong, Ding Kengbo, Miaoyue Zhang, Ye-tao TangAbstract:Rare-earth elements (REEs) are known to be a group of emerging pollutants, but the geochemistry of REEs in river waters in Ion-adsorptIon rare-earth mining areas has attracted little attentIon. In this study, samples of the 90% of the acidified bulk water). Furthermore, REE patterns indicated that the REE-associated large colloids were mineral or mixed mineral-organic matter (OM) at upstream sites and OM-dominated or functIonalized at downstream sites. The particles were mainly coated by inorganic matter substances (e.g., Fe/Al oxyhydroxides). In summary, our results reveal that REE patterns provide a useful tool to study the fate of REEs in Ion-adsorptIon rare-earth mining catchments.
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Water, sediment and agricultural soil contaminatIon from an Ion-adsorptIon rare earth mining area
Chemosphere, 2019Co-Authors: Wen-shen Liu, Mei-na Guo, Chang Liu, Ming Yuan, Xin-tian Chen, Hermine Huot, Chun-mei Zhao, Ye-tao Tang, Jean-louis Morel, Rong-liang QiuAbstract:Due to their specific properties, Ion-adsorptIon rare earth mine sites may be a threat for adjacent environments. This work was undertaken to assess whether former mining operatIons on Ion-adsorptIon rare earth mine sites have a significant impact on water bodies and soils of the surrounding environments. Tailing soil materials, stream waters and sediments, and farmland soils were collected from one of the largest Ion-adsorptIon rare earth mine sites worldwide (Southern China). Total concentratIons of rare earth elements (REEs), Fe, Al, etc., and pH were measured. Results revealed high concentratIons of REEs in tailing soils (392 mg kg(-1)), stream waters (4460 mu g L-1), sediments (462 mg kg(-1)) and farmland soils (928 mg kg(-1)) in comparison with control sites. In the tailing profiles, light REEs (LREEs) were preferentially leached compared to middle REEs (MREEs) and heavy REEs (HREEs). Anomalies in tailings and stream water indicated strong soil weathering (Eu) and leaching activities (Ce) within the tailings. The MREE enriched pattern in stream water was more related to water parameters such as Al and Fe oxides, and ligands, than to the source of REEs. Anomalies also indicated that REEs contaminatIon in the farmland soils was mainly originated from the stream water contaminated by the leaching from the tailings. In conclusIon, a heavy REEs pollutIon was recorded in the surrounding environment of Ion adsorptIon rare earth mine. REEs fractIonatIon, Ce and Eu anomalies provided an insight to the understanding of REEs leaching and soil weathering processes, and REEs environmental fate in rare earth mining area.
Hermine Huot - One of the best experts on this subject based on the ideXlab platform.
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ReclamatIon with organic amendments and plants remodels the diversity and structure of bacterial community in Ion-adsorptIon rare earth element mine tailings
Journal of Soils and Sediments, 2020Co-Authors: Ye Liu, Wen-shen Liu, Mei-na Guo, Chang Liu, Hermine Huot, Yuanqing Chao, Xi Zhong, Yingheng Fei, Shizhong WangAbstract:The success of phytoremediatIon relies on beneficial plant-microbe interactIons. However, the changes of soil microbiota, during the phytoremediatIon of Ion-adsorptIon rare earth element (REE) mine tailings, are far from understood. The present study was conducted to reveal the co-occurrence patterns and key regulating factors of bacterial communities in Ion-adsorptIon REE mine tailings with phytoremediatIon. A field experiment was conducted on an Ion-adsorptIon REE mine tailing to test three phytoremediatIon strategies: (i) phytostabilizatIon with grasses, (ii) phytostabilizatIon with economic crops, and (iii) phytoextractIon with REE hyperaccumulators. The bacterial community diversity, co-occurrence patterns, and the key regulating environmental factors in bulk and rhizospheric soils after 16 months of reclamatIon were studied by 16S Illumina high-throughput sequencing. The soils of plots with REEs-hyperaccumulators had significantly higher α-diversity than those planted with non-accumulators. After phytoremediatIon, the diversity and relative abundances of bacteria assisting in nutrient acquisitIon pronouncedly increased in the bulk soil of the reclaimed plots. Some plant growth–promoting bacteria (PGPB), e.g., Rhodanobacter, Streptomyces, and Bacillus, were enriched in the rhizospheric soil samples. Meanwhile, soil nutrient (total carbon and total nitrogen) concentratIon and REE availability were the most significant factors shaping the bacterial communities. Furthermore, special bacterial consortia of Bacilli took up the positIons of the keystone species. The results revealed the co-occurrence patterns and key regulating factors of bacterial communities in Ion-adsorptIon REE mine tailings, which will provide more crucial informatIon for the optimizatIon of the reclamatIon of REE tailings.
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Controls on rare-earth element transport in a river impacted by Ion-adsorptIon rare-earth mining.
The Science of the total environment, 2019Co-Authors: Wen-shen Liu, Hermine Huot, Chun-mei Zhao, Meng-yuan Zheng, Yuanqing Chao, Xi Zhong, Ding Kengbo, Miaoyue Zhang, Ye-tao TangAbstract:Rare-earth elements (REEs) are known to be a group of emerging pollutants, but the geochemistry of REEs in river waters in Ion-adsorptIon rare-earth mining areas has attracted little attentIon. In this study, samples of the 90% of the acidified bulk water). Furthermore, REE patterns indicated that the REE-associated large colloids were mineral or mixed mineral-organic matter (OM) at upstream sites and OM-dominated or functIonalized at downstream sites. The particles were mainly coated by inorganic matter substances (e.g., Fe/Al oxyhydroxides). In summary, our results reveal that REE patterns provide a useful tool to study the fate of REEs in Ion-adsorptIon rare-earth mining catchments.
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Water, sediment and agricultural soil contaminatIon from an Ion-adsorptIon rare earth mining area
Chemosphere, 2019Co-Authors: Wen-shen Liu, Mei-na Guo, Chang Liu, Ming Yuan, Xin-tian Chen, Hermine Huot, Chun-mei Zhao, Ye-tao Tang, Jean-louis Morel, Rong-liang QiuAbstract:Due to their specific properties, Ion-adsorptIon rare earth mine sites may be a threat for adjacent environments. This work was undertaken to assess whether former mining operatIons on Ion-adsorptIon rare earth mine sites have a significant impact on water bodies and soils of the surrounding environments. Tailing soil materials, stream waters and sediments, and farmland soils were collected from one of the largest Ion-adsorptIon rare earth mine sites worldwide (Southern China). Total concentratIons of rare earth elements (REEs), Fe, Al, etc., and pH were measured. Results revealed high concentratIons of REEs in tailing soils (392 mg kg(-1)), stream waters (4460 mu g L-1), sediments (462 mg kg(-1)) and farmland soils (928 mg kg(-1)) in comparison with control sites. In the tailing profiles, light REEs (LREEs) were preferentially leached compared to middle REEs (MREEs) and heavy REEs (HREEs). Anomalies in tailings and stream water indicated strong soil weathering (Eu) and leaching activities (Ce) within the tailings. The MREE enriched pattern in stream water was more related to water parameters such as Al and Fe oxides, and ligands, than to the source of REEs. Anomalies also indicated that REEs contaminatIon in the farmland soils was mainly originated from the stream water contaminated by the leaching from the tailings. In conclusIon, a heavy REEs pollutIon was recorded in the surrounding environment of Ion adsorptIon rare earth mine. REEs fractIonatIon, Ce and Eu anomalies provided an insight to the understanding of REEs leaching and soil weathering processes, and REEs environmental fate in rare earth mining area.
Chun-mei Zhao - One of the best experts on this subject based on the ideXlab platform.
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Controls on rare-earth element transport in a river impacted by Ion-adsorptIon rare-earth mining.
The Science of the total environment, 2019Co-Authors: Wen-shen Liu, Hermine Huot, Chun-mei Zhao, Meng-yuan Zheng, Yuanqing Chao, Xi Zhong, Ding Kengbo, Miaoyue Zhang, Ye-tao TangAbstract:Rare-earth elements (REEs) are known to be a group of emerging pollutants, but the geochemistry of REEs in river waters in Ion-adsorptIon rare-earth mining areas has attracted little attentIon. In this study, samples of the 90% of the acidified bulk water). Furthermore, REE patterns indicated that the REE-associated large colloids were mineral or mixed mineral-organic matter (OM) at upstream sites and OM-dominated or functIonalized at downstream sites. The particles were mainly coated by inorganic matter substances (e.g., Fe/Al oxyhydroxides). In summary, our results reveal that REE patterns provide a useful tool to study the fate of REEs in Ion-adsorptIon rare-earth mining catchments.
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Water, sediment and agricultural soil contaminatIon from an Ion-adsorptIon rare earth mining area
Chemosphere, 2019Co-Authors: Wen-shen Liu, Mei-na Guo, Chang Liu, Ming Yuan, Xin-tian Chen, Hermine Huot, Chun-mei Zhao, Ye-tao Tang, Jean-louis Morel, Rong-liang QiuAbstract:Due to their specific properties, Ion-adsorptIon rare earth mine sites may be a threat for adjacent environments. This work was undertaken to assess whether former mining operatIons on Ion-adsorptIon rare earth mine sites have a significant impact on water bodies and soils of the surrounding environments. Tailing soil materials, stream waters and sediments, and farmland soils were collected from one of the largest Ion-adsorptIon rare earth mine sites worldwide (Southern China). Total concentratIons of rare earth elements (REEs), Fe, Al, etc., and pH were measured. Results revealed high concentratIons of REEs in tailing soils (392 mg kg(-1)), stream waters (4460 mu g L-1), sediments (462 mg kg(-1)) and farmland soils (928 mg kg(-1)) in comparison with control sites. In the tailing profiles, light REEs (LREEs) were preferentially leached compared to middle REEs (MREEs) and heavy REEs (HREEs). Anomalies in tailings and stream water indicated strong soil weathering (Eu) and leaching activities (Ce) within the tailings. The MREE enriched pattern in stream water was more related to water parameters such as Al and Fe oxides, and ligands, than to the source of REEs. Anomalies also indicated that REEs contaminatIon in the farmland soils was mainly originated from the stream water contaminated by the leaching from the tailings. In conclusIon, a heavy REEs pollutIon was recorded in the surrounding environment of Ion adsorptIon rare earth mine. REEs fractIonatIon, Ce and Eu anomalies provided an insight to the understanding of REEs leaching and soil weathering processes, and REEs environmental fate in rare earth mining area.
Xiao Yanfei - One of the best experts on this subject based on the ideXlab platform.
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A discussIon on the leaching process of the Ion-adsorptIon type rare earth ore with the electrical double layer model
Minerals Engineering, 2018Co-Authors: Xiao Yanfei, Feng Zongyu, Lai Fuguo, Gao Guohua, Long ZhiqiAbstract:Abstract The practice of in-situ leaching of the Ion-adsorptIon type rare earth ore using (NH 4 ) 2 SO 4 had revealed serious ammonia-nitrogen pollutIon. Therefore, a discussIon on the leaching process of the Ion-adsorptIon type rare earth ore with the electrical double layer model was presented in this paper, so as to screen out the green and efficient leaching agent and the appropriate leaching measures to improve the rare earth leaching efficiency and reduce or even eliminate ammonia-nitrogen emissIons. It was determined that the leaching process could be described as the formatIon of a new stable electric double layer (EDL). The potential φ ( x ) with the distance x from clay surface to bulk solutIon in the diffusIon layer was obtained, it showed that the potential φ ( x ) would decrease with the increase of the catIonic charge of leaching agent, the leaching temperature and the concentratIon of leaching agent, leading to a higher rare earth leaching efficiency. The theoretical analysis was verified by soak leaching experiments. The results showed that the law of rare earth leaching efficiency was in agreement with the theoretical analysis. And the rare earths partitIon in the leaching liquor under different conditIons was substantially constant except cerium element. Therefore, the catIon and anIon of leaching agent should have a large electric density and be environmental friendly, of which magnesium sulfate could be preferred. Moreover, chemical substances, which could form a more stable coordinatIon with rare earth Ions, could be used as an assistant to promote the leaching equilibrium to move toward a favorable directIon. This paper had provided a theoretical foundatIon and applicatIon basis for the leaching of rare earth from the Ion-adsorptIon type rare earth ore, and show the directIon on reducing or even eliminate ammonia-nitrogen emissIons.
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Compound leaching of rare earth from the Ion-adsorptIon type rare earth ore with magnesium sulfate and ascorbic acid
Hydrometallurgy, 2018Co-Authors: Lai Fuguo, Xiao Yanfei, Gao Guohua, Yang Run, Li KaizhongAbstract:Abstract To reduce the consumptIon of MgSO4 and to leach the colloidal sediment phase rare earth, a MgSO4-ascorbic acid compound leaching agent was introduced to deal with the Ion-adsorptIon type rare earth ore. The ascorbic acid was used as an assistant to enhance the leaching of the Ion-exchangeable phase rare earth and to reductively leach the colloidal sediment phase rare earth, making use of its ability to coordinate with rare earth Ions and its reductive properties. It was determined that the total rare earth leaching efficiency was 86.2% and the Ce partitIon was 5.62% at a flow rate of 0.60 mL/min, an initial pH of 2.50, a liquid to ore ratio of 1.30 mL/g, and 0.15 mol/L magnesium sulfate and 1.0 g/L ascorbic acid in the leaching agent. The concentratIons of Al and Fe in the leaching liquor were 21.36 mg/L and 30.22 mg/L, respectively. Moreover, the contents of the Ion-exchangeable phase and the colloidal sediment phase rare earth in the leaching tailings were 0.03‰ and 0.06‰, respectively. The leaching efficiency of the colloidal sediment phase rare earth was approximately 57.1%. Hence, an alternative process would be provided for the leaching of rare earth from Ion-adsorptIon type rare earth ore. The process could reduce the consumptIon of MgSO4 and would have great significance for environmentally-friendly extractIon of Ion-adsorptIon type rare earth ore and the improvement of resource utilizatIon.
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Recovery of rare earth from the Ion-adsorptIon type rare earths ore: II. Compound leaching
Hydrometallurgy, 2016Co-Authors: Xiao Yanfei, Feng Zongyu, Huang Xiaowei, Chen Yingying, Liu Xiangsheng, Wang Liangshi, Long ZhiqiAbstract:Abstract In order to coordinate the content and ratio of Ion-exchangeable calcium and Ion-exchangeable magnesium in the soil and reduce ammonia nitrogen pollutIon, recovery of rare earth from the Ion-adsorptIon type rare earths ore with magnesium–ammonium, magnesium–calcium and magnesium–ammonium–calcium compound leaching agent was studied in this paper. Results showed that the leaching ability was in the order of (NH 4 ) 2 SO 4 > NH 4 Cl > MgSO 4 > MgCl 2 ≈ CaCl 2 under the same total catIonic charge. The content of Ion-exchangeable magnesium and Ion-exchangeable calcium in water washing tailings could be adjusted to be suitable for the plant growth by changing the compositIon of leaching agent. In the magnesium–ammonium–calcium compound leaching system, when the mole ratio of magnesium–ammonium–calcium was 15:25:60, 628.57 mg·kg − 1 Ion-exchangeable magnesium and 77.77 mg·kg − 1 Ion-exchangeable calcium in water washing tailings were achieved, while the ratio of Ion-exchangeable calcium and magnesium was 8.08. Moreover, the aluminum leaching efficiency was only 49.2% and the rare earth leaching efficiency could be above 94%. Furthermore, the soybeans could grow normally with water washing tailings in magnesium–ammonium–calcium compound leaching system with an average plant height of 25.5 cm. The applicatIon of magnesium–ammonium–calcium compound leaching agent could significantly reduce the ammonia nitrogen pollutIon, maintain the soil nutrient so as to reduce the dosage of calcium–magnesium fertilizer, and may realize the ecological friendly leaching of the Ion-adsorptIon type rare earths ore.
