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The temperature and pressure evolutions over time for the selected high-pressure modified aragonite structure at ρ = 5.99 g/cm 3 and different temperatures are depicted in Fig. 2.When the initial temperature is 16000 K, the temperature rapidly decreases to approximately half of the initial value, stabilizing at around 6816 K, …
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Reduction of the calcination temperature to 700 °C reduces the calcite decomposition and the negative impact on reactivity. BET specific surface area versus calcination temperature for materials ...
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Calcite (CaCO 3) composition and properties are defined by the chemical environment in which CaCO 3 forms. However, a complete understanding of the relationship between aqueous chemistry during calcite precipitation and resulting chemical and physical CaCO 3 properties remains elusive; therefore, we present an investigation …
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The article "The impact of calcite impurities in clays containing kaolinite on their reactivity in cement after calcination", written by Franco Zunino, Emmanuelle Boehm-Courjault and Karen Scrivener, was originally published electronically on the publisher's internet portal on 16 April 2020 without open access.
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Calcite (CaCO3) is one of the most common minerals in geologic and engineered systems. It is often in contact with aqueous solutions, causing chemically assisted fracture that is critical to understanding the stability of subsurface systems and manmade structures. Calcite fracture was evaluated with reactive molecular dynamics …
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During the AC preparation process when using flue gas as an activator, calcite in coal could impact its physicochemical development significantly, and further influence AC performance. To reveal the correlation of calcite in coal on AC topology, the phase transformation of calcite, pore and carbon texture, surface chemistry and …
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This study investigated the impact of calcite grains on the mechanical behavior of coal. A grain-breakable FDEM model was constructed based on the mineral composition data of the coal containing calcite grains. The model was calibrated to experimental results, and then triaxial compression tests with different confining …
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We conducted a laboratory experiment with two soils, one containing calcite and one without calcite to study how calcite affects soil carbon dioxide. Our results show that calcite effects can be identified …
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In seawater-like solutions, ion pairing, complexation, and the presence of organics and other chemical inhibitors can strongly impact calcite precipitation rate and Mg incorporation into calcite (Morse et al., 2007). Accordingly, caution must be taken when extrapolating our experimental results to natural systems. 5. Conclusions
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The highest were in calcite formed from hydrothermal solns. and from carbonatite magma. Maximum total mole fraction of REE was 4.72 × 10-4, which represents one substituted atom for about 2000 Ca sites. In comparison, synthetic calcite, pptd. at growth rates slow enough to insure solid soln. formation, incorporated 7.5 × 10-4 mole …
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This study explored the effect of calcite (calcium carbonate) and gibbsite (aluminum hydroxide) impurities on the reactivity of a model calcined clay. Pure …
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The idea is to use calcite-rich materials to capture and sequester carbon dioxide emissions from industrial sources or directly from the atmosphere. However, the feasibility and environmental impact …
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Semantic Scholar extracted view of "The impact of outgassing of CO2 and prior calcium precipitation to the isotope composition of calcite precipitated on stalagmites. Implications for reconstructing climate information from proxies" by W. Dreybrodt et al.
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The Impact and Implications of Aragonite-to-calcite Transformation on Speleothem Trace Element Composition - Volume 28 Issue S1 Online ordering is currently unavailable due to technical issues. We apologise for any delays responding to customers while …
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The difference in the curves for dolomite and calcite further highlights the impact of reaction rate limitations on acidizing breakthrough volume. The dissolution pattern becomes more uniform, and the acidizing process becomes more reaction-rate-limited. Dolomite rocks show increased sensitivity at higher injection rates compared to …
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Guides. Where to use and turn in Pyro Sigils in Genshin Impact. Exchange Pyro Sigils for rewards in Natlan. Diego Perez. |. Published: Aug 28, 2024 04:13 pm.
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The endotherms associated with calcium hydroxide and calcite decreased with time (Fig. 5 a and 5b), indicative of continuing reaction which led to increased contents of C-A-S-H, ettringite, carboaluminates and hydrotalcite. Limestone appeared to have had no measurable influence on the C-A-S-H and ettringite endotherms in the sulphate …
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A series of batch experiments were performed to understand F immobilization processes in the presence of calcite and phosphate (Table 1).A 50 mL solution containing 0.42 mM fluoride (8 mg·L −1) and 1 mM phosphate (94 mg·L −1) in ultrapure water was taken in a polypropylene screw-cap centrifuge tube.The experimental solution was …
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The use of supplementary cementitious materials as a partial replacement for Portland cement is the most effective way to reduce the carbon footprint of the concrete industry. Raw clays containing kaolinite (kaolin) are promising substitute materials. In the field, raw clays are often mixed with calcite and this is thought to affect their behaviour …
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We measured dynamic contact angles (CA) on untreated and aged calcite substrates using brines with different salinities and compositions and model oils, that is, mixtures of varying concentrations of stearic acid (SA) and n-decane. In particular, the impacts of the concentrations of Ca 2+, SO 4 2-, and OH-ions on the adsorption …
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This review aims to quantify the impact of calcium chloride in cementation solutions on Microbial Induced Calcite Precipitation (MICP). Specific soil strength properties, such as the Unconfined ...
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Although the impact of calcite recrystallization on geochemical signals is recognized, little research has been conducted on the recrystallization of calcite speleothems (Melim and Spilde, 2011; Melim et al., 2021; Scholz et al., 2014; Frisia, 2015), mainly because speleothem calcite is typically considered stable, and obtaining …
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The lack of understanding of calcite recrystallization in speleothems, including the process and dynamics involved in this phenomenon and its impact on calcite stable isotope, trace element, and U Th isotope compositions, makes it even more challenging to diagnose when speleothem calcite has recrystallized under open- or …
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The primary cause responsible for the excessive salinity of water is most likely leachate from coal fly ash slurry and fertilizers that seep into the groundwater system. The use of irrigation water that is highly loaded with salts can increase the soil salinity over a …
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A mass-balance model of calcite precipitation was developed to investigate the interactions of the varied processes governing the generation and fate of calcite in lakes. The model was used in conjunction with data to assess the evolution and impact of calcite precipitation for calcareous, ultraoligotrophic Torch Lake, Michigan (USA).
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The use of supplementary cementitious materials as a partial replacement for Portland cement is the most effective way to reduce the carbon footprint of the concrete industry. Raw clays containing kaolinite (kaolin) are promising substitute.
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Despite the potential broad utility of nanoparticles in hydrate-related fields, there remains a paucity of studies on the impacts of nanoparticles on gas hydrate formation. In this study, massive microsecond molecular dynamics simulations were performed to investigate the roles of calcite nanoparticles on the formation processes of …
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The carbonation of (m-serpentine + m-wollastonite) involved the formation of a combination of calcite (CaCO 3) and magnesite (MgCO 3), suggesting that no significantly …
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The semi-brittle regime in calcite rock is thus characterized by many interacting deformation mechanisms. One way to quantify the relative contribution of each mechanism to the overall rheological behavior is to test the impact of independent variables beyond the usual pressure and temperature conditions and imposed strain rate.
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Calcite impurities in clay form a granular deposit on the surface of kaolinite which reduces surface area and slightly impact reactivity. However, the effect is minor and therefore, calcite ...
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