Results 31 to 40 of about 5,096 (207)
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
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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
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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
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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
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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
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The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China [PDF]
, 2018 publisher: Elsevier articletitle: The origin of secondary heavy rare earth element enrichment in carbonatites: Constraints from the evolution of the Huanglongpu district, China journaltitle: Lithos articlelink: http://dx.doi.org/10.1016/j.lithos.2018.02 ...
Brnicky, M +8 more
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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
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Mineralogy of alluvial sediments of Avzyan gold region (the Southern Urals)
Литосфера, 2018 The Avzyan gold region is located within the Bashkirian anticlinorium and includes lode gold deposits and placers. The Gorny Priisk, Bogryashka and Ulyuk-Bar gold deposits are hosted in the Riphean metamorphosed carbonaceous sequence.
Ekaterina E. Palenova +4 more
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Decomposition of Xenotime by Sulfuric Process
The Journal of the Society of Chemical Industry, Japan, 1965 各種高純度材料として用いられる希土類元素中,イットリウム族化合物の分離精製法を検討するため本研究を行なった。第1段階として原鉱石の分解法(硫酸分解)について実験した。従来から用いられている方法,硫酸による浸漬法,水浸法について実験した結果,ゼノタイム粉末20gを1～2mlの水で湿潤し, 湿潤試料に濃硫酸60ml加え, 260～280℃ で2 時間加熱して分解すればイットリウム分はより効果的に抽出できた。ゼノタイム(50.0%Y2O3)粉末20gを上記の方法で分解し, 粗製酸化イットリウム(95～96%純度)9.5gが得られた。
Itiro TOYAMA, Tomizo NAKAMURA
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Vestnik MGTURare Earth Elements (REE) and yttrium phosphates monazite-(Ce) and xenotime-(Y), fluorine carbonates synchysite-(Ce) and parisite-(Ce), silicate allanite-(Ce) have been studied in the metamorphic rocks in the area of the Pellapahk Cu-Mo porphyry ...
Kalinin A. A. +2 more
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