書誌事項
- タイトル別名
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- Experimental magnesitization of calcite at 150℃ and partitioning behavior of REE between magnesite and hydrothermal solution
- ネッスイ ジョウケン 150ドC ニ オケル カルサイト ノ マグネサイトカ ハンノウ ノ ジョウケン ト マグネサイト ト ネツ スイヨウエキ カン ノ キドルイ ゲンソ ブンパイ キョドウ
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Reagent grade calcite was reacted with MgCl2 solutions doped with REE (Mg concentration of 0.089M-1.8M and REE concentration of about 0.3 ppm each) at 150℃ for 10 or 20 days. Solid products were identified by X-ray diffraction. Solid and liquid phases were analyzed for Mg, Ca and REE. The solid phases reacted with MgCl2 solutions (0.89M and 1.8M of Mg2+) were almost magnesite (about 95%). The molar ratios of Mg/(Mg + Ca) in solutions of the run products were consistent with the extrapolation of the reported experimental equations in the high temperature range from 275℃ to 420℃ to lower temperatures. The values of pH at room temperature of the final solutions are ranging from 5-7, and they show a decreasing trend with increasing Mg concentration. This is probably caused by the precipitation reaction of brucite, which is more likely to occur at 150℃ than at 25℃. The REE partition coefficients between solid and liquid phases defined by Kd(REE)={XREE/(XMg+XCa)}solid/{[REE]/([Mg]+[Ca])}liquid have been determined experimentally. The series variation of logKd (REE) in the run in which the solid phases were almost magnesite, shows a decreasing trend in LREE and a convex tetrad effect.
収録刊行物
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- 地球化学
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地球化学 40 (3), 239-244, 2006
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282680718364928
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- NII論文ID
- 110008680129
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- NII書誌ID
- AN00141280
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- ISSN
- 21885923
- 03864073
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- NDL書誌ID
- 8077448
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可