scholarly journals Experimental measurements of the permeability characteristics of rare earth ore under the hydro-chemical coupling effect

RSC Advances ◽  
2018 ◽  
Vol 8 (21) ◽  
pp. 11652-11660 ◽  
Author(s):  
Xiaojun Wang ◽  
Yulong Zhuo ◽  
Kui Zhao ◽  
Wen Zhong
Keyword(s):  
Rare Earth ◽  
Coupling Effect ◽  
Experimental Measurements ◽  
Permeability Characteristics ◽  
Leaching Process ◽  
Chemical Coupling ◽  
Coupling Processes

Two coupling processes—solution seepage and chemical replacement—occur in the in situ leaching process of ion-absorbed-rare-earth ore.

Rare earth metals sorption recovery from uranium in situ leaching process solutions

Rare Metals ◽  
2014 ◽  
Vol 34 (3) ◽  
pp. 195-201 ◽  
Author(s):  
N. M. Shokobayev ◽  
C. Bouffier ◽  
T. S. Dauletbakov
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Leaching Process ◽  
Uranium In Situ Leaching ◽  
Sorption Recovery ◽  
Process Solutions

Synthetic zircon doped with hafnium and rare earth elements: A reference material for in situ hafnium isotope analysis

2011 ◽  
Vol 286 (1-2) ◽  
pp. 32-47 ◽  
Author(s):  
Christopher M. Fisher ◽  
John M. Hanchar ◽  
Scott D. Samson ◽  
Bruno Dhuime ◽  
Janne Blichert-Toft ◽  
...  
Keyword(s):  
Rare Earth ◽  
Reference Material ◽  
Rare Earth Elements ◽  
Isotope Analysis

Effect of potassium chloride on leaching process of residual ammonium from weathered crust elution-deposited rare earth ore tailings

2021 ◽  
Vol 163 ◽  
pp. 106800
Author(s):  
Jian Feng ◽  
Junxia Yu ◽  
Shuxin Huang ◽  
Xiaoyan Wu ◽  
Fang Zhou ◽  
...  
Keyword(s):  
Rare Earth ◽  
Potassium Chloride ◽  
Leaching Process ◽  
Weathered Crust

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 characterization of rare earth-CdTe heterostructures by ion beam analysis

1994 ◽  
Vol 249 (2) ◽  
pp. 266-270 ◽  
Author(s):  
P Gros ◽  
G Fiat ◽  
D Brun ◽  
B Daudin ◽  
J Eymery ◽  
...  
Keyword(s):  
Rare Earth ◽  
Ion Beam ◽  
In Situ Characterization ◽  
Ion Beam Analysis ◽  
Beam Analysis

Analysis of Casing Strength after Casing Wear in Ultra-Deep Rock Salt Formation

2012 ◽  
Vol 616-618 ◽  
pp. 538-542 ◽  
Author(s):  
Fu Xiang Zhang ◽  
Wei Feng Ge ◽  
Xiang Tong Yang ◽  
Wei Zhang ◽  
Jian Xin Peng
Keyword(s):  
Rock Salt ◽  
Coupling Effect ◽  
Equivalent Stress ◽  
Horizontal Stress ◽  
In Situ Stress ◽  
Attrition Rate ◽  
Salt Formation ◽  
Salt Creep ◽  
Casing Wear

To alleviate the problems of casing collapse induced by the coupling effect of rock salt creep and casing wear, the effects of salt creep, attrition rate and casing abrasive position on the equivalent stress on casings in non-uniform in-situ stress field is analyzed by finite-difference model with worn casing, cement and salt formation. It indicates that, creep reduces the yield strength of worn casing to a certain extent; Equivalent stress on casings is bigger and more non-uniform when the abrasion is more serious; Wear position obviously changes the distribution of equivalent stress on casing, and when the wear located along the direction of the minimum in-situ stress, equivalent stress on casing could be the largest that leads to the casing being failed more easily. Equivalent stress on casings increases gradually with creep time increasing and will get to balance in one year or so; In addition, new conclusions are obtained which are different from before: the maximum equivalent stress on casings is in the direction of the minimum horizontal stress, only when the attrition rate of the casing is little; otherwise, it is not. This method could help to improve the wear prediction and design of casings.

A discussion on the leaching process of the ion-adsorption type rare earth ore with the electrical double layer model

2018 ◽  
Vol 120 ◽  
pp. 35-43 ◽  
Author(s):  
Xiao Yanfei ◽  
Gao Guohua ◽  
Huang Li ◽  
Feng Zongyu ◽  
Lai Fuguo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Double Layer ◽  
Electrical Double Layer ◽  
Ion Adsorption ◽  
Layer Model ◽  
Leaching Process ◽  
Double Layer Model
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