Leaching Process and Mechanism of Weathered Crust Elution-Deposited Rare Earth Ore

He, Zhengyan; Zhang, Rong; Nie, W. X.; Zhang, Zhenyue; Chi, Ruan; Zhang, Xu; Wu, Ming; Qu, Jun

doi:10.1007/s42461-019-00116-5

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…We adopted the values of effective ionic radii of REEs as nondime parameters αr to evaluate the effects of ionic size. Based on the modified model [E (12)], the ionic mobilities of REEs in the weathering crust are predicted to increa La (14.041 × 10 −9 m 2 /Vs) to Yb (15.896 × 10 −9 m 2 /Vs), and to Sc (17.660 × 10 −9 m 2 /Vs) 3b]. According to Equation ( 13), the electromigration velocities (assuming 100 V applied voltage gradient) of REEs in the weathering crust are also predicted to i from La (1.404 × 10 −6 m/s) to Yb (1.590 × 10 −6 m/s), and to Sc (1.766 × 10 −6 m/s) [Figu Interestingly, the predictions of the modified model [Equations ( 12) and ( 13)] a pletely contrary to those of the conventional model [Equations ( 10) and ( 11)], i.e., transport faster than LREEs in weathering crusts.…”

Section: Precidition Results Of Ree Transport By Electrokinetic Trans...mentioning

confidence: 99%

“…The adsorbed REEs can be recovered by leaching, and ammonium salts are the most commonly applied leaching agents. So far, pond leaching, heap leaching, and in situ leaching have been the most common techniques for IAD mining [11,12]. However, governmental restrictions tend to be imposed on these techniques because of several drawbacks, including grievous environmental damage, low recovery efficiency, and long leaching time [7,[13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Transport Model of Rare Earth Elements in Weathering Crusts during Electrokinetic Mining

Wang,

Ling,

Liang

et al. 2024

Minerals

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Electrokinetic mining (EKM) is a novel method for rare earth element (REE) mining that can achieve green and efficient recovery of REEs. However, as yet, there is no accurate model for describing the electrokinetic transport of REEs in weathering crusts, and this hinders the wider application of EKM. The conventional model fails to capture the microscale transport physics occurring in the nanochannels that exist ubiquitously in weathering crusts. Consequently, the existing models cannot distinguish the mobilities of different REEs. Here, we report a new model for a more faithful description of the electrokinetic transport of REEs in weathering crusts that considers the ionic size, which has previously been neglected. We reveal that the electrokinetic transport of heavy REEs (HREEs) is faster than that of light REEs (LREEs) in weathering crusts, which is contrary to the predictions of conventional models. Our model was validated experimentally by measurements of the electrokinetic transport of two LREEs (La and Sm) and an HREE (Er) in weathering crusts. The speed of electrokinetic transport follows the order Er > Sm > La. Our findings suggest that the ionic size is a non-negligible factor affecting the electrokinetic transport of REEs in weathering crusts containing nanochannels. This work offers a constitutive model to describe the electrokinetic transport of REEs in weathering crusts, which promotes both theoretical developments and practical applications of EKM.

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Section: Precidition Results Of Ree Transport By Electrokinetic Trans...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transport Model of Rare Earth Elements in Weathering Crusts during Electrokinetic Mining

Wang,

Ling,

Liang

et al. 2024

Minerals

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show abstract

“…China has been at the forefront of research and development for these unique deposits, applying the ion-exchange leaching procedure for the extraction of lanthanides via three successive generations of technology. The first-generation leaching technology employed batch leaching with NaCl, The secondgeneration technology used batch and heap leaching with (NH 4 ) 2 SO 4 , and the third generation comprised in-situ leaching with (NH 4 ) 2 SO 4 , which has been summarized by Chi et al (2013). The conventional flow sheet is shown in Figure 5.…”

Section: Extraction Techniquesmentioning

confidence: 99%

Development and beneficiation technology of rare earth ores in China

Chen

Potgieter

2022

J. S. Afr. Inst. Min. Metall.

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The demand for rare earth elements (REE) is increasing rapidly owing to the emergence of new clean-energy and defense-related technologies. China's dominates the world production of REE. In this paper, we review the ore characteristics of four typical REE deposits in China and discuss the conventional beneficiation techniques, including gravity and magnetic separation, flotation, and hydrometallurgical processing of these ores. Some of the latest laboratory findings and industrial applications, as well as the development of novel reagents for REE processing in China are presented. The REE beneficiation technologies developed and employed in China could constitute a good case study for many other emerging projects being explored around the world.

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Behavior and mechanism of different fraction lead leach with several typical sulfate lixiviants in the weathered crust elution-deposited rare earth ore

Tang

Qiao

Xue

et al. 2021

Environ Sci Pollut Res

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Leaching Process and Mechanism of Weathered Crust Elution-Deposited Rare Earth Ore

Cited by 10 publications

References 22 publications

Transport Model of Rare Earth Elements in Weathering Crusts during Electrokinetic Mining

Transport Model of Rare Earth Elements in Weathering Crusts during Electrokinetic Mining

Development and beneficiation technology of rare earth ores in China

Behavior and mechanism of different fraction lead leach with several typical sulfate lixiviants in the weathered crust elution-deposited rare earth ore

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