Instability behavior of bubble supported organic liquid membrane in extraction of low-concentration rare earths from in-situ leaching solutions of ion-adsorption ores

2020 ◽  
Vol 159 ◽  
pp. 106645
Author(s):  
Jie Liu ◽  
Xiaohong Wu ◽  
Kun Huang ◽  
Wenqian Liu ◽  
Zhenmin Zhao ◽  
...  
Keyword(s):  
Rare Earths ◽  
Liquid Membrane ◽  
Organic Liquid ◽  
Ion Adsorption ◽  
Low Concentration

Extraction of rare earths using bubbling organic liquid membrane with un-saponified P507

2018 ◽  
Vol 175 ◽  
pp. 340-347 ◽  
Author(s):  
Jie Liu ◽  
Kun Huang ◽  
Xiaohong Wu ◽  
Wenqian Liu ◽  
Weiyuan Song ◽  
...  
Keyword(s):  
Rare Earths ◽  
Liquid Membrane ◽  
Organic Liquid

Evaluating the fractionation of ion-adsorption rare earths for in-situ leaching and metallogenic mechanism

2018 ◽  
Vol 36 (12) ◽  
pp. 1333-1341 ◽  
Author(s):  
Qiuhua Xu ◽  
Lifeng Yang ◽  
Dashan Wang ◽  
Xiao Hou ◽  
Yuanyuan Sun ◽  
...  
Keyword(s):  
Rare Earths ◽  
Ion Adsorption ◽  
Metallogenic Mechanism

scholarly journals Start-up Strategies for Anaerobic Ammonia Oxidation (Anammox) in In-Situ Nitrogen Removal from Polluted Groundwater in Rare Earth Mining Areas

2021 ◽  
Vol 13 (8) ◽  
pp. 4591
Author(s):  
Shuanglei Huang ◽  
Daishe Wu
Keyword(s):  
Rare Earth ◽  
Low Temperature ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Ex Situ ◽  
High Concentration ◽  
Low Concentration ◽  
Start Up ◽  
Anammox Activity

The tremendous input of ammonium and rare earth element (REE) ions released by the enormous consumption of (NH4)2SO4 in in situ leaching for ion-adsorption RE mining caused serious ground and surface water contamination. Anaerobic ammonium oxidation (anammox) was a sustainable in situ technology that can reduce this nitrogen pollution. In this research, in situ, semi in situ, and ex situ method of inoculation that included low-concentration (0.02 mg·L−1) and high-concentration (0.10 mg·L−1) lanthanum (La)(III) were adopted to explore effective start-up strategies for starting up anammox reactors seeded with activated sludge and anammox sludge. The reactors were refrigerated for 30 days at 4 °C to investigate the effects of La(III) during a period of low-temperature. The results showed that the in situ and semi in situ enrichment strategies with the addition of La(III) at a low-concentration La(III) addition (0.02 mg·L−1) reduced the length of time required to reactivate the sludge until it reached a state of stable anammox activity and high nitrogen removal efficiency by 60–71 days. The addition of La(III) promoted the formation of sludge floc with a compact structure that enabled it to resist the adverse effects of low temperature and so to maintain a high abundance of AnAOB and microbacterial community diversity of sludge during refrigeration period. The addition of La(III) at a high concentration caused the cellular percentage of AnAOB to decrease from 54.60 ± 6.19% to 17.35 ± 6.69% during the enrichment and reduced nitrogen removal efficiency to an unrecoverable level to post-refrigeration.

In situ tailoring bimetallic-organic frameworks derived yolk-shell NiS2/CuS hollow microspheres: an extraordinary kinetically pseudocapacitive nanoreactor for effective sodium-ion storage anode

2021 ◽  
Author(s):  
wen xi zhao ◽  
Xiaodeng Wang ◽  
Xiaoqing Ma ◽  
Luchao Yue ◽  
Qian Liu ◽  
...  
Keyword(s):  
Sodium Ion ◽  
Ion Adsorption ◽  
Redox Kinetics ◽  
Diffusion Limited ◽  
Ion Storage ◽  
Sluggish Diffusion ◽  
Fast Ion ◽  
Adsorption Desorption ◽  
Sodium Ion Storage

Pseudocapacitive electrochemical Na+-storage has been highlighted as one of the exploitable strategies in overcoming sluggish diffusion-limited redox kinetics due to effectively structural preserving and fast ion adsorption/desorption at the surface...

scholarly journals Mercury methylation in paddy soil: source and distribution of mercury species at a Hg mining area, Guizhou Province, China

2016 ◽  
Vol 13 (8) ◽  
pp. 2429-2440 ◽  
Author(s):  
Lei Zhao ◽  
Christopher W. N Anderson ◽  
Guangle Qiu ◽  
Bo Meng ◽  
Dingyong Wang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Surface Soil ◽  
Ambient Air ◽  
Rice Paddy ◽  
Guizhou Province ◽  
Mercury Species ◽  
Low Concentration ◽  
Paddy Water ◽  
Hg Mining

Abstract. Rice paddy plantation is the dominant agricultural land use throughout Asia. Rice paddy fields have been identified as important sites for methylmercury (MeHg) production in the terrestrial ecosystem and a primary pathway of MeHg exposure to humans in mercury (Hg) mining areas. We compared the source and distribution of Hg species in different compartments of the rice paddy during a complete rice-growing season at two different typical Hg-contaminated mining sites in Guizhou province, China: an abandoned site with a high Hg concentration in soil but a low concentration in the atmosphere and a current-day artisanal site with a low concentration in soil but a high concentration in the atmosphere. Our results showed that the flux of new Hg to the ecosystem from irrigation and atmospheric deposition was insignificant relative to the pool of old Hg in soil; the dominant source of MeHg to paddy soil is in situ methylation of inorganic Hg (IHg). Elevated MeHg concentrations and the high proportion of Hg as MeHg in paddy water and the surface soil layer at the artisanal site demonstrated active Hg methylation at this site only. We propose that the in situ production of MeHg in paddy water and surface soil is dependent on elevated Hg in the atmosphere and the consequential deposition of new Hg into a low-pH anoxic geochemical system. The absence of depth-dependent variability in the MeHg concentration in soil cores collected from the abandoned Hg mining site, consistent with the low concentration of Hg in the atmosphere and high pH of the paddy water and irrigation water, suggested that net production of MeHg at this site was limited. We propose that the concentration of Hg in ambient air is an indicator for the risk of MeHg accumulation in paddy rice.

Sign in / Sign up

Export Citation Format

Share Document