Results 31 to 40 of about 123 (90)

Stepwise leaching rare earth from weathered crust elution-deposited rare earth ores by the inhibition leaching of aluminum with HMTA

Environmental Science and Pollution Research
Abstract In the leaching process of rare earth (RE) from weathered crust elution-deposited rare earth ores (WCE-DREO), the exchangeable impurity ions will also be exchanged and enter the RE leachate. Impurity removal must be treated before precipitating RE, which often causes the serious loss of RE and environmental pollution.
Zhengyan He, Qin Zuo, Yuchen Tang, Wenqian Cui, zhigao xu, Ming Wu, Jun Qu, Ruan Chi   +7 more
openaire   +2 more sources

Simulation of one-dimensional column leaching of weathered crust elution-deposited rare earth ore

Transactions of Nonferrous Metals Society of China, 2019
Abstract The ion exchange model of the leaching process was determined via batch leaching experiments using the Kerr model, with the selectivity coefficient experimentally determined to be 12.59×10−10 L2/g2. Solute transport laws of ammonium ions (NH4+) and rare earth ions (RE3+) in column leaching were described by the convection−dispersion equation
Ping LONG, Guan-shi WANG, Jun TIAN, Shi-li HU, Si-hai LUO   +4 more
openaire   +1 more source

Effects of Reagent Concentration and Particle Size οn Diffusion Rate of Mixed Ores with Rare Elements

, 2013
The leaching reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The influence of concentration of reagents and particle size of ore on leaching rate was investigated.
Yang, X., L. Zhang, Zhang, L., X.Z. Yang
core   +1 more source

Direct reuse of rare earth oxalate precipitation mother liquor for rare earth leaching

, 2019
In the recovery process of rare earth (RE) from the weathered crust elution-deposited rare earth ore, ammonium sulfate is used as the leaching liquor to leach RE, and then the leachate containing RE3+ can be precipitated by oxalic acid and the RE oxalate
Liu, Xueme, Chi, Ruan, Wu, Xiaoyan, Feng, Jian, Zhang, Zhenyue, Zhou, Fang   +5 more
core   +1 more source

Seepage process on weathered crust elution-deposited rare earth ores with ammonium carboxylate solution

, 2020
In order to reveal the seepage law of ammonium carboxylate solution in the in-situ leaching process of weathered crust elution-deposited rare earth ores, the effects of concentration, pH, temperature, particle size and porosity on permeability were ...
Chen, Zhuo, Chai, Xiuwei, Zhang, Han, Chi, Ru-an, Liu, Defeng, Zhang, Zhenyue, Zou, Hualiang   +6 more
core  

Adsorption of lanthanum(III) and yttrium(III) on kaolinite: kinetics and adsorption isotherms

, 2019
Experimental investigations were carried out using kaolinite to adsorb two rare earth ions, lanthanum ion (La3+) and yttrium ion (Y3+), which will provide some useful information and new insights on the mineralization process and fractionation phenomenon
Xie, Xiong, Wu, Baihong, Chi, Ruan, Feng, Jian, Wu, Xiaoyan, Zhou, Fang, Liu, Qi   +6 more
core   +1 more source

Enrichment and Fractionation of Rare Earth Elements in High-Altitude Thick Weathered Crust Elution-Deposited Rare Earth Ore

Minerals
Weathered crust elution-deposited rare earth ores (WCE-REOs) are the primary global source of medium and heavy rare earth elements (M/HREEs). The recent discovery of high-altitude (1500–2500 m) WCE-REOs in southern Yunnan Province, China, presents new opportunities for the development of M/HREE resources.
Zhenyue Zhang, Dan Li, Fei Long, Ruan Chi, Zhuo Chen   +4 more
openaire   +1 more source

Adsorption of Sc on the Surface of Kaolinite (001): A Density Functional Theory Study. [PDF]

Materials (Basel), 2023
Zhao Z, Wang K, Wu G, Jiang D, Lan Y.
europepmc   +1 more source

Polymer-based treatments to control runoff, leachate and erosion from engineered slopes at Simfer Mine, Guinea, Africa [PDF]

, 2013
It is necessary to understand the erodibility and hydrological response of mine-site slope forming materials (SFMs), because of increasing awareness of the environmental impacts of mining.
Campbell, Stephanie
core  

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source