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- W2000670043 abstract "This paper describes a chemical processing route of a rare-earth oxide precursor, in which rare-earth carbonate powders are prepared directly from disperse systems of rare-earth-loaded carboxylate solutions and water, using carbon dioxide gas as a precipitant. This synthetic route of rare-earth carbonate is a combined process of the stripping and precipitation stages in a conventional solvent extraction. Tertiary carboxylate solutions of lanthanum and yttrium gave precipitates of lanthanum carbonate and yttrium carbonate, when contacted with both water and pure carbon dioxide gas at 10−80 °C and 0.1−3.0 MPa for 2 h. The rates of carbonate precipitation in a batch autoclave were sensitive to processing parameters such as carbon dioxide pressure, temperature, and organic-phase composition. The particle size distributions of the carbonate powders were markedly dependent on the operating temperature: the mean particle size of yttrium carbonate drastically decreased from 41 μm at 80 °C to 7.2 μm at 10 °C." @default.
- W2000670043 created "2016-06-24" @default.
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- W2000670043 date "2001-03-15" @default.
- W2000670043 modified "2023-10-17" @default.
- W2000670043 title "Precipitation Stripping of Rare-Earth Carbonate Powders from Rare-Earth-Loaded Carboxylate Solutions Using Carbon Dioxide and Water" @default.
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- W2000670043 doi "https://doi.org/10.1021/ie0007668" @default.
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