Calcite precipitation by a high-pressure CO2 carbonation route

Domingo, Concepción; Loste, Eva; Gómez‐Morales, Jaime; Garcı́a-Carmona, Jesús; Fraile, Julio

doi:10.1016/j.supflu.2005.06.006

Cited by 106 publications

(87 citation statements)

References 28 publications

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“…The used CO 2 flux is substantial so as to provide the gas/liquid reaction. However, after a certain limit, increasing the CO 2 pressure does not have any effect as derived in a previous study [13]. Calcium carbonate precipitation occurs above pH 7.51, whereas the reaction of Eqn.…”

supporting

confidence: 50%

Kinetics of Calcium Carbonate (CaCO₃) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

Yıldırım

Akarsu²

2009

Helvetica Chimica Acta

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b ) Camis Mining Co., Is Kuleleri, Kule 3, TR-34300, 4. Levent, IstanbulThe effects of time, CO 2 -gas-injection pressure, and bulk temperature on the precipitation of Ca 2þ ions as a precipitated calcium carbonate (PCC) from a dolomite leach solution were investigated. Precipitation periods from 1 to 7 min were examined, and experiments were run at CO 2 -injection pressures of 200 -800 kPa. Effects of bulk temperature were studied in the range from 40 to 708, and precipitation rates of PCC were determined by measuring the Ca 2þ concentrations in the initial and effluent solutions. Influences of these parameters on the subsequent incorporation of Mg 2þ ions with the precipitate are discussed in detail. Kinetic analysis of the precipitation was performed by considering the rates as a function of CO

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confidence: 50%

Kinetics of Calcium Carbonate (CaCO₃) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

Yıldırım

Akarsu²

2009

Helvetica Chimica Acta

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“…The conversion of calcium oxide to calcium hydroxide is followed by the dissolution of calcium hydroxide to yield calcium ions and hydroxide ions on the surface of the particle and finally by the diffusion of calcium and hydroxide ions into the bulk of solution (Fig. 4) [25,26]. The solution becomes strongly alkaline (pH = 12.9) and oversaturated with Ca 2+ ions (Ca 2+ = 1,400-1,500 mg/L, Table 2).…”

Section: Batch Experiments and Studies Of Process Decelerationmentioning

confidence: 99%

MINERAL TRAPPING OF CO₂VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM

Uibu¹,

Kuusik²

2009

Oil Shale

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Ash containing considerable amounts of free lime as the most active component requires stabilization to assure safe landfilling. Using CO 2 from flue gases as a neutralizing agent, also the emission of CO 2 is diminished. The most extensive effect could be achieved by treating ash-water suspensions with CO 2 -containing gas. As even minute amounts of extraneous substances present in water influence the extent and rate of lime solubility in water, the behavior of lime as the key component of ash in various conditionswas studied and the mechanism of process deceleration was proposed. As the next step, a laboratory-scale continuous-flow reactor system for aqueous carbonation of oil shale ash and main considerations for industrial pilotscale plant design were developed. IntroductionEmission of greenhouse gases and safe deposition/utilization of solid wastes are among the most serious problems caused by extensive usage of lowgrade solid fuels in the world heat and power production. CO 2 emissions could be decreased by reducing the usage of fossil energy sources, improving energy efficiency and/or by more intensive implementation of carbon capture and storage (CCS) technologies. CO 2 sequestration by mineral carbonation, considering both natural minerals [1,2] and alkali wastes [3][4][5] as CO 2 sorbents, is a prospective option.Carbonation of minerals is similar to natural rock weathering and involves permanent storage of CO 2 under the thermodynamically stable form of calcium and magnesium carbonates [6]. Mg-and Ca-rich silicates such as olivine, serpentine, talc and wollastonite are available worldwide and have * Corresponding author: e-mail maiuibu@staff.ttu.ee Mineral Trapping of CO2 via Oil Shale Ash Aqueous Carbonation 41the potential of sequestrating the total amount of CO 2 emitted from the combustion of all the available fossil fuel reservoirs [7]. Unfortunately, because of very slow reaction rates the carbonation of natural minerals requires chemical additives and/or elevated pressures and temperatures [8].One way of bypassing some draw-backs of accelerated carbonation of primary alkaline earth minerals is using alkaline waste residues from thermal processes or from construction and demolition activities as a feedstock. As these materials are often associated with CO 2 point source emissions and tend to be chemically more unstable than geologically derived minerals [9], they require a lower degree of pre-treatment and less energy-intensive operating conditions to enhance carbonation yields [9,10]. Furthermore, after stabilization by accelerated carbonation, the leaching behavior of alkaline waste materials such as municipal solid waste incinerator (MSWI) bottom ash [11,12], steel slag [4,9,13,14], air pollution control (APC) residues [15,16] and ashes from coal and oil shale power plants [17][18][19] is improved. This allows the usage of stabilized waste materials in civil engineering applications or for safer final disposal to landfill.The energy sector of the Republic of Estonia is predominantly (up to 67...

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“…9,10 In our previous work, 11 the physical-chemical properties of PCC, prepared by carbonation of slaked lime in the batch and semicontinuous processes, were compared. Other important ways to influence on the PCC particle morphology are the use of magnetic field, 12,13 high pressure, 14,15 or a specific additive. [16][17][18][19][20][21][22] The paper industry uses a huge amount of calcium carbonate as a filler component.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

Kontrec¹,

Ukrainczyk²,

Babić-Ivančić³

et al. 2011

Croat. Chem. Acta

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Abstract. Precipitated calcium carbonate (PCC) was prepared by means of semicontinuous carbonation of Ca(OH) 2 suspension, at 35 and 45 °C and in the presence of non-ionic dextran and dextran sulfate. The carbonation process was regulated at different predetermined values of electrical conductivity, that corresponded to different concentrations of dissolved Ca(OH) 2 : 0.5 mS cm. The results of physicalchemical characterization of the product showed that calcite was the only polymorphic modification obtained in the whole range of experimental conditions investigated. In addition, it was found that morphology, crystal size distribution and specific surface area of PCC strongly depended on the electrical conductivity / concentration of dissolved Ca(OH) 2 , at which the process was performed: predominantly scalenohedral crystals of higher surface area (about 5 m 2 g −1) were produced at higher electrical conductivity, while at lower electrical conductivity predominantly rhomohedral calcite crystals of relatively low specific surface area were obtained. In the system of the highest electrical conductivity, κ 25 = 5.0 mS cm, and at 35 °C, the addition of non-ionic dextran significantly influenced the process by preventing the regulation. The crystals that appeared were in the form of irregular aggregates of high specific surface area, S ≈ 29 m 2 g −1. FT-IR and TG analyses indicated that the non-ionic dextran was adsorbed onto the calcite surface, most probably by relatively strong and specific interactions between oxygen from the hydroxyl groups of dextran molecules and calcium ions from the crystal surface. On the contrary, the anionic dextran (dextran sulfate) exerted minor effects in the course of semicontinuous carbonation process and in the properties of the final product, PCC. However, the analysis of the precipitate indicated that dextran sulfate was adsorbed at the surfaces, most probably by the weak and non-specific electrostatic interactions. (doi: 10.5562/cca1746)

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Calcite precipitation by a high-pressure CO2 carbonation route

Cited by 106 publications

References 28 publications

Kinetics of Calcium Carbonate (CaCO₃) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

Kinetics of Calcium Carbonate (CaCO₃) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

MINERAL TRAPPING OF CO₂VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM

Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

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Calcite precipitation by a high-pressure CO2 carbonation route

Cited by 106 publications

References 28 publications

Kinetics of Calcium Carbonate (CaCO3) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

Kinetics of Calcium Carbonate (CaCO3) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

MINERAL TRAPPING OF CO2VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM

Synthesis of Calcium Carbonate by Semicontinuous Carbonation Method in the Presence of Dextrans

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Kinetics of Calcium Carbonate (CaCO₃) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

Kinetics of Calcium Carbonate (CaCO₃) Precipitation from a Icel‐Yavca Dolomite Leach Solution by a Gas (Carbon Dioxide)/Liquid Reaction

MINERAL TRAPPING OF CO₂VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM