Results 11 to 20 of about 132 (97)

Leaching process of rare earths from weathered crust elution-deposited rare earth ore

Transactions of Nonferrous Metals Society of China, 2010
In order to strengthen the leaching procedure, the chemical processes of leaching rare earths (RE) from the weathered crust elution-deposited rare earth ore were investigated frow the viewpoints of kinetics, hydrodynamic and mass transfer. The results show that the leaching hydrodynamics follows the Darcy law.
Ruan Chi
exaly   +2 more sources

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   +2 more sources

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   +2 more sources

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
openaire   +3 more sources

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   +2 more sources

Development Review on Leaching Technology and Leaching Agents of Weathered Crust Elution-Deposited Rare Earth Ores

Minerals (Basel, Switzerland), 2023
Weathered crust elution-deposited rare earth ores are key strategic resources and the main source of medium and heavy rare earths. This paper summarizes the development of leaching technology of rare earth ores, compares the advantages and disadvantages of the three generations of leaching technology, and introduces the improved heap leaching ...
Zhigao Xu, Huifang Yang, Zhengyan He
exaly   +2 more sources

Extraction of rare earths from the leach liquor of the weathered crust elution-deposited rare earth ore with non-precipitation

International Journal of Mineral Processing, 2011
Abstract In this paper, the development and research connotations of extraction of rare earths from the leach liquor of the weathered crust elution-deposited rare earth ore with non-precipitation, including solvent extraction, ion exchange and liquid membranes were introduced respectively.
Tian Jun, Yin Jingqun, Chen kaihong, Rao Guohua, Jiang Mintao, Chi Ruan   +5 more
openaire   +2 more sources

One step purification of impurities in the leachate of weathered crust elution-deposited rare earth ores

, 2017
Physicochemical Problems of Mineral Processing; ISSN 2084 ...
Fang, Zhou, Jian, Feng, Ziqing, Wang, Yuanlai, Xu, Zhenyue, Zhang, Ruan, Chi   +5 more
openaire   +2 more sources

Optimization of a Rare Earth and Aluminum Leaching Process from Weathered Crust Elution-Deposited Rare Earth Ore with Surfactant CTAB

Minerals
Ammonium sulfate is typically employed as a leaching agent in the in situ leaching of weathered crust elution-deposited rare earth ore. However, it is associated with challenges such as low efficiency in mass transfer for rare earth (RE) leaching, high usage of the leaching agent, and prolonged leaching duration.
Xiaoyan Wu, Jian Feng, Fang Zhou, Chufan Liu, Ruan Chi   +4 more
openaire   +2 more sources

Column leaching process of rare earth and aluminum from weathered crust elution-deposited rare earth ore with ammonium salts

Transactions of Nonferrous Metals Society of China, 2016
In order to better understand the leaching process of rare earth (RE) and aluminum (Al) from the weathered crust elution-deposited RE ore, the mass transfer of RE and Al in column leaching was investigated using the chromatographic plate theory. The results show that a higher initial ammonium concentration in a certain range can enhance the mass ...
Junxia Yu, Zhigao Xu, Fang Zhou
exaly   +2 more sources