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  • Calcite precipitation from CO -H O-Ca(OH) slurry under ...

    1 1 Calcite precipitation from CO 2-H 2O-Ca(OH) 2 slurry under 2 high pressure of CO 2 3 4 G. Montes-Hernandez *a, b, F. Renard a, c, N. Geoffroy a, L. Charlet a, J. Pironon b 5 6 a LGIT, CNRS-OSUG-UJF, Maison de Géosciences, BP 53 X, 38420 Grenoble Cedex 9 7 b G2R, Nancy Université, CNRS, BP 239, 54506 Vandoeuvre lès-Nancy, France 8 c Physics of Geological Processes, University of Oslo, Norway

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  • Calcite precipitation from CO2–H2O–Ca(OH)2 slurry under ...

    10/1/2007· Schematic experimental system for calcite precipitation from CO 2 –H 2 O–Ca(OH) 2 slurry in presence of supercritical (90 bar and 90 °C) and gaseous (55 bar and 30 °C) CO 2. At the end of the experiment, the autoclave was removed from the heating system and immersed in cold water.

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  • Carbonate Precipitation through Microbial Activities in ...

    1/20/2016· Carbonate Precipitation through Microbial Activities in Natural Environment, and Their Potential in Biotechnology: A Review ... photosynthetic microbes are responsible for triggering calcite precipitation (Arp et al., 2001; Dittrich and Obst, ... and bicarbonate is converted to CO 2 and OH −, the so-called CO 2 concentration mechanism.

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  • Analysis and simulation of monodispersed, nanostructured ...

    Calcite was produced by controlled fast precipitation through gaseous carbon dioxide adsorption in calcium hydroxide slurry with the constant discus revolution speed rate equal to 120 r min −1. ... Geoffroy, N. Rhombohedral calcite precipitation from CO 2-H 2 O-Ca(OH) 2 slurry under supercritical and gas CO2 media. J Cryst Growth 2007; ...

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  • Analysis and simulation of monodispersed, nanostructured ...

    In the presented experiments the carbonation process in multiphase system was carried out using the reactor with rotating discs. Calcite was produced by controlled fast precipitation through gaseous carbon dioxide adsorption in calcium hydroxide slurry with the constant discus revolution speed rate equal to 120 r min−1. Initial concentration and volume of the slurry was equal to 23 mM l−1 ...

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  • Modelling of Calcium Carbonate Synthesis by Gas-Liquid ...

    Modelling of Calcium Carbonate Synthesis by Gas-Liquid Reaction Using CO2 from Flue Gases Raluca Isopescu* 1, Mihaela Mihai, Constantin Capat2, Alina Olaru2, Carmencita Mateescu3, Ovidiu Dumitrescu1, Ion Udrea2 1 University Politehnica of Bucharest, Centre of Technology Transfer in the Process Industries 1-5, Gheorghe Polizu Street, Bucharest, Romania, [email protected]

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  • Calcite precipitation from CO2-H2O-Ca(OH)2 slurry under ...

    Request PDF on ResearchGate | Calcite precipitation from CO2-H2O-Ca(OH)2 slurry under high pressure of CO2 | The formation of solid calcium carbonate (CaCO3) from aqueous solutions or slurries ...

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  • US6022517A - Acicular calcite and aragonite calcium ...

    The present invention relates to a calcium carbonate composition having both calcite and aragonite crystalline morphology. More particularly, the present invention relates to an acicular calcite and an acicular aragonite product and a method for the production of the same and the use of such as fillers, additives and modifiers of consumer and commercial products such as toothpaste, paper ...

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  • Evaluation of Various Synthesis Methods for Calcite ...

    tated calcium carbonate with Ca(OH) 2-CO2-H2 O system by the continuous drop method of Ca(OH) 2 slurry into the solution containing CO 2 (aq) [17]. When the flow rate of CO 2 gas increased and the concentration of Ca(OH)2 slurry became low, the absorptions rate of CO 2 gas became faster than the dissolution rate of Ca(OH) 2; consequently, the ...

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  • Calcium carbonate : Wikis (The Full Wiki)

    For still lower CO 2 pressure, Ca(OH) 2 precipitation will occur before CaCO 3 precipitation. As ambient CO 2 partial pressure increases to levels above atmospheric, pH drops, and much of the carbonate ion is converted to bicarbonate ion, which results in higher solubility of Ca 2+.

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  • Removal of boron from wastewater by precipitation of a ...

    The solubility of ascharite (2MgO·B 2 O 3 ·H 2 O) is estimated to be 0.008% B 2 O 3 (10 mg of boron per liter) at 25° C, which corresponds to the lowest published value. Nevertheless, as for calcium borates, no data concerning its conditions of formation can be found in the literature.

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  • Calcite precipitation by a high-pressure CO 2 ... - DeepDyve

    1/1/2006· Read "Calcite precipitation by a high-pressure CO 2 carbonation route, The Journal of Supercritical Fluids" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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  • Nanostructured calcite precipitated under hydrothermal ...

    11/24/2011· In order to better understand the interaction of aqueous selenium species with carbonates, we studied the precipitation of calcite under hydrothermal conditions (30–90 °C, 25–90 bar) in a CO 2 –H 2 O–Ca(OH) 2 medium in the presence of aqueous inorganic and organic selenium compounds.

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  • Textural properties of synthetic nano-calcite produced by ...

    2 which the CO2 is bubbled through an aqueous slurry of slaked lime [17]. 3 Ca OH ( ) s CO aq2( ) 2( ) + → CaCO s + 3( ) 2 H O (1) 4 The carbonation reaction is the crucial step determining the textural properties (such as 5 average particle size, particle size distribution, morphology and specific surface area) of the 6 obtained product. For ...

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  • Lime (Calcium Hydroxide) for use in pH Neutralization Systems

    Calcium Hydroxide -Lime-There are many chemicals available on the market today that are suitable for use as neutralization chemicals. The most commonly used chemicals are discussed in an article available here: Neutralization Chemicals. Calcium Hydroxide Ca(OH) 2 Calcium Hydroxide [Ca(OH) 2].Also commonly referred to as slaked lime or hydrated lime; calcium hydroxide is formed as a result .

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  • Rapid Precipitation of Magnesite Microcrystals from Mg(OH ...

    Rapid Precipitation of Magnesite Microcrystals from Mg(OH) 2-H 2 O-CO 2 Slurry Enhanced by NaOH and a Heat-Aging Step (from ∼20 to 90 °C)

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  • Preparation and characterization of ultra- hydrophobic ...

    calcite particles from calcium carbide slag for CO 2 fixation by accelerated mineral ... such as initial Ca(OH) 2 concentration, CO 2 ... When the pH value decreased to 9 the reaction was completed and then the CO. 2. flow was stopped. The slurry was washed, filtered and dried at 120°C in an oven for 24 hrs to obtain the CaCO. 3.

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  • Calcium carbonate - Wikipedia

    Calcium carbonate is a chemical compound with the formula Ca CO 3.It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock consisting mainly of calcite) and is the main component of pearls and the shells of marine organisms, snails, and eggs.Calcium carbonate is the active ingredient in agricultural lime and ...

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