Calcite, dolomite and magnesite dissolution kinetics in aqueous solutions at acid to circumneutral pH, 25 to 150 °C and 1 to 55 atm pCO2: New constraints on CO2 sequestration in sedimentary basins

Pokrovsky, Oleg S.; Голубев, С. В.; Schott, Jacques; Castillo, Alain

doi:10.1016/j.chemgeo.2009.01.013

Cited by 313 publications

(223 citation statements)

References 46 publications

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“…Furthermore, the review by Morse et al [28] has suggested that much fundamental knowledge is lacking in understanding surface-controlled calcite dissolution reactions. The calcite dissolution data reported by Pokrovsky et al [26,27] were affected by mass transfer limitations even at the highest speed available in their rotating-disc reactor. Little is known about the influences of temperature and pressure on the calcite dissolution in the surface-reaction-controlled regime.…”

Section: Introductionmentioning

confidence: 98%

“…In order to account for the minor pH change during dissolution, the amount of calcite dissolved was recalculated to the pH value at the start of the experiment, assuming the proton-promoted dissolution rates related to this pH change is linearly dependent on the H + activity change [26] and the relationship can be described by Eqn. 9 at all temperatures:…”

Section: Calcite Dissolution Rate In the (Co2 + H2o) Systemmentioning

confidence: 99%

“…Pokrovsky et al [26,27] have measured the dissolution of calcite, dolomite and magnesite at temperatures up to 423 K with pressures up to 5.5 MPa. However, typical CO2 storage aquifers at depths of 1,000 metres will have pressures of around 10 MPa which may further increase to (12 to 15) MPa with the continuous injection of CO2 [1].…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of calcite dissolution in CO2-saturated water at temperatures between (323 and 373) K and pressures up to 13.8 MPa

et al. 2015

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We report measurements of the calcite dissolution rate in CO2-saturated water at pressures ranging from (6.0 to 13.8) MPa and temperatures from (323 to 373) K. The rate of calcite dissolution in HCl(aq) at temperatures from (298 to 353) K was also measured at ambient pressure with pH between 2.0 and 3.3. A specially-designed batch reactor system, implementing a rotating disc technique, was used to obtain the dissolution rate at the solid/liquid interface of a single crystal, free of mass transfer effects. We used Vertical Scanning Interferometry to examine the texture of the calcite surface produced by the experiment and the results suggested that at far-from-equilibrium conditions, the measured calcite dissolution rate was independent of the initial defect density due to the development of a dynamic dissolution pattern which became steady-state shortly after the onset of dissolution. The results of this study indicate that the calcite dissolution rate under surface-reactioncontrolled conditions increases with increase of temperature from (323 to 373) K and CO2 partial pressure from (6.0 to 13.8) MPa. Fitting the conventional first order transition state kinetic model to the observed rate suggested that, although sufficient to describe calcite dissolution in CO2-free HCl(aq), this model clearly underestimate the calcite dissolution rate in the (CO2 + H2O) system over the range of conditions studied. A kinetic model incorporating both pH and the activity of CO2(aq) has been developed to represent the dissolution rates found in this study. We report correlations for the corresponding reaction rate coefficients based on the Arrhenius equation and compare the apparent activation energies with values from the literature. The results of this study should facilitate more rigorous modelling of mineral dissolution in deep saline aquifers used for CO2 storage.2

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Section: Introductionmentioning

confidence: 98%

Section: Calcite Dissolution Rate In the (Co2 + H2o) Systemmentioning

confidence: 99%

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Kinetics of calcite dissolution in CO2-saturated water at temperatures between (323 and 373) K and pressures up to 13.8 MPa

et al. 2015

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“…Experimental studies of carbonate dissolution kinetics have shown that metal carbonate weathering usually depends upon three parallel reactions occurring at the carbonate interface (Chou et al, 1989;Plummer et al, 1978;Pokrovsky et al, …”

Section: Kinetics Of Carbonate Dissolution/precipitation: Controllingmentioning

confidence: 99%

Impact of different fertilizers on carbonate weathering in a typical karst area, Southwest China: a field column experiment

et al. 2017

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Abstract. Carbonate weathering, as a significant vector for the movement of carbon both between and within ecosystems, is strongly influenced by agricultural fertilization, since the addition of fertilizers tends to change the chemical characteristics of soil such as the pH. Different fertilizers may exert a different impact on carbonate weathering, but these discrepancies are as yet not well-known. In this study, a field column experiment was conducted to explore the response of carbonate weathering to the addition of different fertilizers. We compared 11 different treatments, including a control treatment, using three replicates per treatment. Carbonate weathering was assessed by measuring the weight loss of limestone and dolostone tablets buried at the bottom of soil-filled columns. The results show that the addition of urea, NH 4 NO 3 , NH 4 HCO 3 , NH 4 Cl and (NH 4 ) 2 CO 3 distinctly increased carbonate weathering, which was attributed to the nitrification of NH + 4 . The addition of Ca 3 (PO 4 ) 2 , Ca-Mg-P and K 2 CO 3 induced carbonate precipitation due to the common ion effect. The addition of (NH 4 ) 3 PO 4 and NaNO 3 had a relatively small impact on carbonate weathering in comparison to those five NH 4 -based fertilizers above. The results of NaNO 3 treatment raise a new question: the negligible impact of nitrate on carbonate weathering may result in an overestimation of the impact of N fertilizer on CO 2 consumption by carbonate weathering on the regional/global scale if the effects of NO 3 and NH 4 are not distinguished.

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“…Both magnesite and dolomite are calcite-group minerals with similar physical and chemical properties and the same crystal structure [11][12][13]. In addition, magnesite and dolomite, as salt-type minerals, can dissolve and give Mg 2+ , Ca 2+ , and other hydrolysis products, which have a crucial effect on the flotation behaviors of magnesite and dolomite in aqueous solution [14]. So, it is difficult to achieve an effective separation of magnesite from dolomite in conventional flotation.…”

Section: Introductionmentioning

confidence: 99%

Elimination of the Adverse Effect of Calcium Ion on the Flotation Separation of Magnesite from Dolomite

et al. 2017

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Abstract:The separation of magnesite from dolomite was studied by flotation tests, X-ray photoelectron spectroscopy (XPS), and zeta potential measurements in the presence of calcium ion (Ca 2+ ) dissolved from dolomite. Sodium oleate (NaOL) was used as collector, and sodium carbonate (Na 2 CO 3 ) and sodium hexametaphosphate (SH) were used as regulators. The results showed that SH had a good selective inhibition ability in pure mineral flotations of magnesite and dolomite. While in the presence of Ca 2+ dissolved from dolomite, magnesite and dolomite were both inhibited by SH. The separation of magnesite from dolomite cannot be realized because Ca 2+ can adsorb on the surface of magnesite in the form of CaCO 3 and change the surface properties of magnesite. Thus, the magnesite flotation was depressed. When the sequence of reagent addition was changed to add SH prior to Na 2 CO 3 , a complex was made by Ca 2+ reacting with SH, which avoided the adsorption of Ca 2+ on the magnesite surface and prevented the changing of the magnesite's surface properties. Then, after adjusting the solution pH with Na 2 CO 3 , the flotation separation of magnesite from dolomite could be achieved.

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Calcite, dolomite and magnesite dissolution kinetics in aqueous solutions at acid to circumneutral pH, 25 to 150 °C and 1 to 55 atm pCO2: New constraints on CO2 sequestration in sedimentary basins

Cited by 313 publications

References 46 publications

Kinetics of calcite dissolution in CO2-saturated water at temperatures between (323 and 373) K and pressures up to 13.8 MPa

Kinetics of calcite dissolution in CO2-saturated water at temperatures between (323 and 373) K and pressures up to 13.8 MPa

Impact of different fertilizers on carbonate weathering in a typical karst area, Southwest China: a field column experiment

Elimination of the Adverse Effect of Calcium Ion on the Flotation Separation of Magnesite from Dolomite

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