Results 41 to 50 of about 7,317 (263)
Energy Geoscience, 2021 Graphitic carbons from the combustion of bituminous coals and, perhaps, other coal ranks, tend to capture iron and a number of hazardous elements, including As, Hg, and Se.
James C. Hower, John G. Groppo
doaj +1 more source
Synchronous N-S and E-W extension at the Tibet-to-Himalaya transition in NW Bhutan [PDF]
, 2015 Despite ~50 Myr of continuous continent-continent collision, contractional structures in the Himalayan-Tibetan orogen are today limited to the northern and southern margins of the system, while extension dominates much of the interior.
Cooper, F.J. +4 more
core +3 more sources
Studies on Decompositiono f Xenotime
The Journal of the Society of Chemical Industry, Japan, 1963 ゼノタイムより希土類元素を抽出する工程のうち,原鉱の硫酸およびカセイソーダによる分解について検討した。試料としたゼノタイム原鉱の組成は,R2O347.39,ThO20.69,SiO21.16,Ta2O5+Nb2O5+TiO213.60,P2O220.90,その他の酸化物14.77(%)で,粒度は100～200メッシュであった。分解の最適条件は次のとおりである。1)硫酸の場合,試料10g,濃硫酸量30ml,処理温度260℃,加熱時間2時間2)カセイソーダの場合,試料3.5g,カセイソーダ濃度50%,使用量20ml(NaOHとして15.3g),処理温度250℃,加熱時間1.5時間カセイソーダの場合,反応系はできるだけ早く乾固状になることがのぞましい。
Gin-ya Adachi +2 more
openaire +2 more sources
REE-bearing minerals in Drava river sediments, Slovenia, and their potential origin
Geologija, 2017 Monazite and xenotime are major ore minerals for rare earth elements (REE), Y, and actinides, a powerful tool for radiometric dating and indicators of the geological genesis of the parent rock.
Aleš Šoster +3 more
doaj +1 more source
International Journal of Technology, 2020 Xenotime sand, a byproduct of the tin mining process of PT Timah, is one of the potential gadolinium (Gd) resources. Because of similarities in their physical and chemical properties, it is difficult to separate and purify Gd from rare earth elements (
Kris Tri Basuki +3 more
doaj +1 more source
Lithosphere, 2022 We used in situ laser-ablation split-stream petrochronology to target monazite and xenotime associated with specific metamorphic index minerals in the Florence Range metamorphic suite in the northern Canadian Cordillera.
R. Soucy La Roche +4 more
doaj +1 more source
The Occurences of Heavy Mineral Placer at Kendawangan and Its Surrounding, West Kalimantan Province [PDF]
, 2017 The main objective of this study is to identify and to determine the variation and content of heavy mineral placer of Kendawangan coastal, offshore and its surrounding area.
Setyanto, A. (Agus) +1 more
core +3 more sources
Synthesis and properties of anhydrous rare-earth phosphates, monazite and xenotime: a review
RSC AdvancesThe synthesis methods, crystal structures, and properties of anhydrous monazite and xenotime (REPO4) crystalline materials are summarized within this review.
Saehwa Chong +5 more
semanticscholar +1 more source
OH defects in synthetic xenotime (YPO4)
European Journal of Mineralogy, 2016 The polarized infrared spectra of hydrogen-containing xenotime (YPO4) were measured to obtain information on its OH defects. Sample syntheses were conducted at 1.0 GPa using a piston-cylinder apparatus under water-saturated conditions. By lowering the temperature at a rate of 10°C/h from 1200 to 800 °C, xenotime single crystals up to ~300 μm in length ...
Takeyasu Abe +2 more
openaire +1 more source
Caracterização mineralógica, geoquímica e potencial econômico de ocorrências de terras raras do maciço granítico Serra do Mendes, Goiás [PDF]
, 2017 Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2017.O Maciço Granítico Serra do Mendes (MGSM) está localizado na Província Estanífera de Goiás (PEG), que é caracterizada por corpos de ...
Zapata Montoya, Angélica María
core +1 more source