Results 1 to 10 of about 97 (77)

Rare Earth Occurrence States of Weathered Crust Elution-Deposited Rare Earth Ores in Southern Yunnan

Minerals, 2023
To reveal the regularity of variation in the rare earth occurrence states of weathered crust elution-deposited rare earth ores, ore samples from different weathering crust layers were obtained by performing the sequential extraction procedure. The order of rare earth contents firmly obeyed the following sequence: the weathered layer > humic layer ...
Wendou Chen, Zhenyue Zhang, Fei Long, Zhuo Chen, Ru’an Chi   +4 more
openaire   +1 more source

Effect of particle gradation on pore structure and seepage law of solution in weathered crust elution-deposited rare earth ores

International Journal of Mining Science and Technology, 2023
Both CT and Avizo software were used to explore the effect of particle gradation on the evolution characteristics of pore structure and seepage paths in weathered crust elution-deposited rare earth ores during leaching.
Defeng Liu, Wenxin Yan, Zhenyue Zhang, Ruan Chi   +3 more
doaj   +1 more source

Leaching Kinetics of Weathered Crust Elution-Deposited Rare Earth Ore with Compound Ammonium Carboxylate [PDF]

Minerals, 2020
Due to the special properties of the ammonium salts, ammonium acetate and ammonium citrate were used to explore the best leaching conditions of rare earth with compound ammonium carboxylate. This paper explored the influence of the molar ratio, ammonium concentration, experimental temperature, and pH of the compound leaching agents on the leaching ...
Xiuwei Chai, Guoqing Li, Zhenyue Zhang, Ruan Chi, Zhuo Chen   +4 more
openaire   +1 more source

Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios

工程科学学报, 2018
The porosity ration of weathered crust elution-deposited rare earth ores is the main factor that affects the leaching results and the stability of the ore body.
YIN Sheng-hua, QI Yan, XIE Fang-fang, CHEN Xun, WANG Lei-ming   +4 more
doaj   +1 more source

Application of chromatographic plate theory on the weathered crust elution-deposited rare earth ore with carboxylate

Physicochemical Problems of Mineral Processing, 2021
Physicochemical Problems of Mineral Processing. Vol. 57, 2021, Issue 4, s. 48-62 ; Fizykochemiczne Problemy Przeróbki Kopalin (1967-1976) ; Physicochemical Problems of Mineral Processing ISSN 1643-1049 (od 2000) ; Fizykochemiczne Problemy Mineralurgii ISSN 0137-1282 (1977-1999 ...
Zhang, Zhenyue, Wang, Guangshuai, Li, Chunhua, Chi, Ruan, Long, Fei, Chen, Zhuo, Chi, Xiaowang, Liu, Defeng   +7 more
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Adsorption Behavior Mechanism of Rare Earths by Iron Oxide–Clay Mineral Composites

Metals
Weathered crust elution-deposited rare earth ores represent a significant source of medium and heavy rare earth elements. Their mineralization mechanism fundamentally involves the adsorption and enrichment of rare earth ions on the surfaces of secondary ...
Dan Li, Zhenyue Zhang, Ruan Chi, Zhuo Chen, Hanjun Wu, Xiangyi Deng, Defeng Liu, Wenda Guo   +7 more
doaj   +1 more source

Influence of Rare Earth Occurrence States on Extraction Rate in Weathered Crust Elution-Deposited Rare Earth Ores

Yankuang ceshi
The occurrence of rare earth elements (REEs) in weathered crust elution-deposited rare earth ore is very complicated, and only the exchangeable adsorption state REEs can be utilized by the current extraction process, demonstrating that the REE resources ...
Yun ZHU, Lei ZHANG, Ran LU, Lin GUO, Tingting YU, Yihua SHI, Shengfeng MA   +6 more
doaj   +1 more source

Study on the Leaching Kinetics of Weathered Crust Elution-Deposited Rare Earth Ores by Hydroxypropyl Methyl Cellulose

Minerals, 2023
In the process of the in situ leaching of weathered crust elution-deposited rare earth ores (WCE-DREOs), there are many problems in the conventional leaching agent, such as a slow leaching rate, low leaching yield and long leaching period. In order to solve the above problems, 2.0 wt% ammonium sulfate was mixed with hydroxypropyl methyl cellulose (HPMC)
Huifang Yang, Aoyang Sha, Zhengyan He, Chenjie Wu, Yuanlai Xu, Jingjing Hu, Zhigao Xu, Ruan Chi   +7 more
openaire   +1 more source

Effects of Ore Particle Size Distribution on Rare Earth Leaching Process of Weathered Crust Elution-Deposited Rare Earth Ores

Minerals
This paper investigates the rare earth (RE) leaching process of weathered crust leached rare earth ores (WCE-DREOs) with different ore particle sizes. Ore particles were categorized into seven distinct size ranges: −0.106 mm, +0.106 mm to −0.15 mm, +0.15 mm to −0.25 mm, +0.25 mm to −0.85 mm and +0.85 mm.
Fei Long, Wendou Chen, Zhenyue Zhang, Ru’an Chi   +3 more
openaire   +1 more source

Leaching Process of Weathered Crust Elution-Deposited Rare Earth Ore by Alkaline Earth Metal Carboxylate

Minerals
This study explores the use of alkaline earth metal carboxylates as sustainable alternatives to conventional ammonium-based lixiviants for the eco-friendly extraction of weathered crust elution-deposited rare earth ores. We investigated the impact of lixiviant concentration, pH, and leaching temperature on the extraction efficiency of rare earths and ...
Fei Long, Ruan Chi, Dan Li, Zhenyue Zhang   +3 more
openaire   +1 more source