Study on Pb release by several new lixiviants in weathered crust elution-deposited rare earth ore leaching process: Behavior and mechanism

Qiao, Jiyang; Tang, Jie; Xue, Qi‐Kun

doi:10.1016/j.ecoenv.2019.110138

Cited by 23 publications

(4 citation statements)

References 29 publications

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“…e first-order kinetic equation, double-constant rate equation, parabolic equation, and modified Elovich equation are the common mathematical models to describe the characteristics of dynamics of soil HMs [20,21]. e first-order kinetic equation is good at describing the simpler surface process of the diffusion mechanism [22]. e double-constant rate equation (also known as Freundlich's correction) is an empirical formula, which is suitable for more complex kinetic reaction processes and can better describe the uneven energy distribution process and the different affinity of adsorption sites to HMs on the surface of soil particles [16].…”

Section: Kinetics Of Cumulative Releasementioning

confidence: 99%

Migration and Transformation of Heavy Metals in the Soil of the Water-Level Fluctuation Zone in the Three Gorges Reservoir under Simulated Nitrogen Deposition

Zhang

Yang

et al. 2021

Journal of Chemistry

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The accumulation of heavy metals (HMs) in the water-level fluctuation zone (WLFZ) of the Three Gorges Reservoir (TGR) area is potentially harmful to the water environment. In order to reveal whether nitrogen (N) deposition is a potential driving factor for the migration and transformation of HMs (Cd, Cr, Cu, Ni, and Pb), a simulated N deposition experiment was performed on the soil in the WFLZ of the TGR. The results showed that the accumulative release amounts of HMs increased with the increase of N deposition. It was found that the Elovich equation, double-constant equation, and parabolic diffusion equation could well describe the release process of Cu, Cd, Cr, and Ni, while the double-constant equation, parabolic diffusion equation, and first-order equation could be applicable for Pb. The exchangeable fractions of HMs increased to varying degrees after the N deposition treatment, wherein Ni was most significant, indicating that N deposition could increase the ecological risk of HM pollution in the TGR area. The results provide insight into the major factors affecting the release of different HMs under N deposition in this vulnerable region ecologically.

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Section: Kinetics Of Cumulative Releasementioning

confidence: 99%

Migration and Transformation of Heavy Metals in the Soil of the Water-Level Fluctuation Zone in the Three Gorges Reservoir under Simulated Nitrogen Deposition

Zhang

Yang

et al. 2021

Journal of Chemistry

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“…1,2 Weathered crust elution-deposited rare earth ore is the world's primary source of medium-heavy rare earths. 3,4 Among them, 80% of REEs are adsorbed on the surface of clay minerals in the ion exchange phase. Currently, chemical leaching with ammonium sulphate as a leaching agent is used in the mining of weathered crust elution-deposited rare earth ores.…”

Section: Introductionmentioning

confidence: 99%

“…Weathered crust elution‐deposited rare earth ore is the world's primary source of medium‐heavy rare earths 3,4 . Among them, 80% of REEs are adsorbed on the surface of clay minerals in the ion exchange phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of rare earth element Y(III) on short‐term denitrification performance of anaerobic ammonia oxidized granular sludge

Wan

Xiao

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND The ammonia‐nitrogen wastewater generated during rare‐earth mining poses a serious hazard to the environment around the mine. This type of wastewater is difficult to treat using conventional biological methods due to its low carbon‐to‐nitrogen ratio. Anaerobic ammonia oxidation (anammox) has become the first choice for treating rare earth mine wastewater. However, the effect of rare earth elements (REEs) in wastewater on anammox bacteria has been insufficiently studied, and this limits the application of this process. Yttrium is a rare earth element present in wastewater, and the study of its effect on anammox can help in the application of this process in rare earth mine wastewater. RESULTS The effect of Y(III) on anammox granular sludge was studied using batch experiments. Anammox activity decreased with increasing Y(III) concentration, from 64.78 ± 0.28 to 17.15 ± 2.70 mg g−1 VSS day−1. The semi‐inhibitory concentration (IC50) of Y(III) for anammox activity was 30.36 mg L−1. Y (III) exhibited low promotion and high inhibition of anammox bacterial extracellular polymer secretion (EPS). Comparing the kinetic models, the Loung model is better suited for describing the kinetic equation of substrate concentration on anammox. CONCLUSION The acute toxicity of Y(III) to anaerobic sludge is influenced by the substrate and Y (III) concentrations. EPS‐based defence strategies play an important role in counteracting the toxicity of Y(III). The Edwards model fits the experimental data well and is suitable for predicting the inhibition of anammox activity by the substrate concentration. © 2022 Society of Chemical Industry (SCI).

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“…It was assumed that PTEs in soil were primarily derived from natural sources [ 13 ], such as weathering of parent soil [ 14 ], and anthropogenic sources, which included mining activities, transportation and agricultural use of fertilizers and pesticides [ 15 , 16 , 17 ]. In particular, the extraction and smelting of raw and auxiliary rare-earth materials can also enrich PTEs in the soil, caused by the presence of PTEs [ 18 , 19 ]. It was noted that Cu, Zn, Pb, and Cr were significantly higher than their background levels around some rare-earth mining areas [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Contamination, Source Identification, Ecological and Human Health Risks Assessment of Potentially Toxic-Elements in Soils of Typical Rare-Earth Mining Areas

Fan

Deng²,

Wang

et al. 2022

IJERPH

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The mining and leaching processes of rare-earth mines can include the entry of potentially toxic elements (PTEs) into the environment, causing ecological risks and endangering human health. However, the identification of ecological risks and sources of PTEs in rare-earth mining areas is less comprehensive. Hence, we determine the PTE (Co, Cr, Cu, Mn, Ni, Pb, Zn, V) content in soils around rare-earth mining areas in the south and analyze the ecological health risks, distribution characteristics, and sources of PTEs in the study area using various indices and models. The results showed that the average concentrations of Co, Mn, Ni, Pb and Zn were higher than the soil background values, with a maximum of 1.62 times. The spatial distribution of PTEs was not homogeneous and the hot spots were mostly located near roads and mining areas. The ecological risk index and the non-carcinogenic index showed that the contribution was mainly from Co, Pb, and Cr, which accounted for more than 90%. Correlation analysis and PMF models indicated that eight PTEs were positively correlated, and rare-earth mining operations (concentration of 22.85%) may have caused Pb and Cu enrichment in soils in the area, while other anthropogenic sources of pollution were industrial emissions and agricultural pollution. The results of the study can provide a scientific basis for environmental-pollution assessment and prevention in rare-earth mining cities.

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Study on Pb release by several new lixiviants in weathered crust elution-deposited rare earth ore leaching process: Behavior and mechanism

Cited by 23 publications

References 29 publications

Migration and Transformation of Heavy Metals in the Soil of the Water-Level Fluctuation Zone in the Three Gorges Reservoir under Simulated Nitrogen Deposition

Migration and Transformation of Heavy Metals in the Soil of the Water-Level Fluctuation Zone in the Three Gorges Reservoir under Simulated Nitrogen Deposition

Effect of rare earth element Y(III) on short‐term denitrification performance of anaerobic ammonia oxidized granular sludge

Contamination, Source Identification, Ecological and Human Health Risks Assessment of Potentially Toxic-Elements in Soils of Typical Rare-Earth Mining Areas

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