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2017925 · At an extraction agent concentration of 0.7 M, mostly round vaterite-phase particles were produced, with a partial morphology change to cubic calcite observed at higher concentrations. Thus, the increased concentration of extracted Ca 2+ was accompanied by increased reactivity, inducing a partial morphology change.
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2014111 · To optimize the performance of our MAT253 IRMS, we first measured the reference gas (vs. itself) under different extraction potentials, which controls the residence time of CO 2 gas in the source. Fig. 1 shows values of Δ 47 determined for the reference gases and distribution of internal precisions for clumped isotope analyses of the same …
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202023 · Artificial mixtures with varied proportions of calcite and dolomite were used to verify the precision of the proposed method. Results The optimized pretreatment conditions for δ 13 C analysis of calcite in the mixture involved purging the sample bottle using helium and then reacting it with 99% H 3 PO 4 for 100 min in a cold water bath at 2°C.
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20221120 · Siderite [FeCO 3] and ankerite [Ca(Fe 2+, Mg, Mn,)CO 3] represent the dominant and best-preserved carbonate minerals in iron formations (Fe-dolomite and calcite being less common), and have provided key insights into the biogeochemical cycles of iron and carbon throughout Earth's history (Beukes and Klein, 1990; Holland, 1984; James, …
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201211 · A wide range of magmatic or metamorphic carbonate rocks (e.g. carbonatites, marbles) may contain mixed calcite and dolomite minerals and, as such, the potential utility of this new method may be extended beyond the research field of sedimentary geochemistry. 2. Material and methods2.1. Calcite and dolomite end …
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202261 · The synthesis method needed to extract HAp from the snail shells is simple and cheap. Snail shells are exoskeletons of aquatic ... with file JCPDS No. 01-083-0577. High intensity peaks of 2θ occurred at 29.5°, 39.5°, 43.2°, 47.5°, and 48.5°. Calcite has a peak at 2θ 28°, slightly to the right of a large aragonite peak, and ...
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DOI: 10.1016/j.molliq.2023.122756 Corpus ID: 260656169; The exploration of tannin extract as a green depressant in the flotation separation of fluorite from calcite @article{Liu2023TheEO, title={The exploration of tannin extract as a green depressant in the flotation separation of fluorite from calcite}, author={Cheng-Lan Liu and Tianyu Wang and …
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202138 · Alumina is the feedstock to produce aluminum and is mainly extracted from Bauxite ore.[] Bauxites are composed mostly of alumina hydrate minerals and, in a lesser amount, hydrated aluminum silicate, iron, and titanium minerals.[] The common industrial way to produce alumina is the well-known Bayer process,[] in which large amounts of a …
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2023111 · Naturally mined bastnäsite-(Ce) is often associated with fluorite, barite, calcite, quartz, hematite, calcium‑barium-bearing REE fluorcarbonates and some silicate minerals, resulting in low rare earth content and difficulty in selection [25, 35].Several techniques are available for separating rare earth ore from gangue minerals, including re …
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Recent studies demonstrated that synthetic calcite may host considerable amounts of arsenic (As). In this paper, the concentration of As in natural calcite was determined using two novel, specifically designed, sequential extraction procedures. In addition, the oxidation state of As and its distribution between calcite and coexisting Fe-oxyhydroxides was …
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