High concentrations of rare earth elements (REE) are found in the bauxite deposits in the Songqi area of Henan Province, North China. However, no studies have been carried out on the occurrences of REE in these bauxite ores. In this study we explored the REE occurrence and their possible en...
BauxiteSongqi regionHenan ProvinceHigh concentrations of rare earth elements (REE) are found in the bauxite deposits in the Songqi area of Henan Province, North China. However, no studies have been carried out on the occurrences of REE in these bauxite ores. In this study we explored the REE...
Mineralogical control and characteristics of rare earth elements occurrence in Carboniferous bauxites from western Henan Province, north China: A XRD, SEM-... High concentrations of rare earth elements (REE) are found in the bauxite deposits in the Songqi area of Henan Province, North China. Howe...
Rare Earth Elements: The Global Supply Chain Marc Humphries Specialist in Energy Policy September 6, 2011 Congressional Research Service 7-5700 R41347 CRS Report for Congress Prepared for Members and Committees of Congress Rare Earth Elements: The Global Supply Chain Summary The concentration of produc...
With indium, gallium and hafnium, predicting the future is particularly complex because these elements are not mined directly. Instead, they are by-products. Indium comes from zinc mining; gallium is predominantly extracted from bauxite during alumina refining; and hafnium is found in zirconium depos...
Other modes of occurrence of Nb have also been found in coal. For example, nano-sized barium niobate (BaNbO3) is present in the Fire Clay coal in Kentucky, derived from volcanic ash, detected by TEM and other microbeam techniques, although no megascopic tonstein occurs in the coal bed (...
In the NaOH leaching process, the difference between the leaching ratio of Al 2 O 3 and SiO 2 in bauxite residue changed from 27.1% to about 60% after reductive roasting under the conditions of maximum Al 2 O 3 extraction ratio with 50.wt% NaOH. The above results have indicated that ...
It was found that Ga, V and As as well as, to a minor extent, Cr are principally accumulated in Bayer process liquors. In addition, Ga is also fractionated to alumina at the end of the Bayer processing cycle. The rest of these elements pass to bauxite residue. REEs and Sc have the ...
Recovery of scandium from leachates of Greek bauxite residue by adsorption on functionalized chitosan–silica hybrid materials Green Chem., 18 (2016), pp. 2005-2013, 10.1039/C5GC02225H View in ScopusGoogle Scholar [6] W. Wang, C.Y. Cheng Separation and purification of scandium by solvent ex...
(STEM) equipped with energy dispersive X-ray spectroscopy (EDS) and elemental mapping was obtained (Fig.1e–l). The result is in agreement with the mineralogy of bauxite residue5; Ce was found to be associated with titanium, whereas scandium was found to be amalgamated with iron and ...