rates limestone dissolution

    • An investigation into the influence of dissolution rate on ...

      The dissolution rate of limestone could be studied by the shrinking core model. It was assumed that the dissolution reaction of limestone gradually reacted from the outermost surface to the center of the particle, and that the limestone particles are non-porous spherical solid particles. The reaction on the particle surface included two control ...

    • (PDF) Comparative study of dissolution rate-determining ...

      Dissolution rate versus P CO2 for rotating speeds at 3,000 rpm (left) and 100 rpm (right). Addition of CA increases the dissolution rates mainly at P CO2 > 100 Pa for limestone, and P CO2 for dolomite

    • (PDF) Limestone dissolution in phreatic conditions at ...

       · Limestone dissolution in phreatic conditions at maximum rates and in pure, cold, water

    • LIMESTONE DISSOLUTION IN WET FLUE GAS …

      2007-7-21 · near the limestone surface could even reach the equilibrium value (≈ 8.2), whereas with Na2SO3 presents the pH possibly does not rise higher than about 6. Another interesting phenomena is the reversal of the pH dependence of the dissolution rate at high concentrations of buffer substances. Usually the limestone dissolution increases with

    • Dissolution rates of limestones of different sources ...

      2000-12-1 · Batch dissolution rates for various limestones were measured at constant pH by using a pH–stat apparatus. The pH was automatically controlled to ±0.02 units by titrating with 0.1 M HCl. The limestone dissolution rate was related to the titration rate by the stoichiometry (13) CaCO 3 +2 HCl ⇌ CaCl 2 + H 2 O + CO 2.

    • Rate models for limestone dissolution: A comparison ...

      1989-6-1 · The models'' abilities to predict the dissolution rate at different pH-values, COz partial pressures and hydrodynamic conditions were Rate of limestone dissolution 1175 -iiir 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Cylinder speed (rpm) FIG. 2.

    • Wet FGD Chemistry and Performance Factors

      2010-4-28 · Dissolution Limestone Precipitation Calcium Sulfate Sulfite Sulfate H+ Chloride Fluoride Carbonate + H+ Bicarbonate Sulfite + H+ Bisulfite Gas Phase Liquid Phase Solid Phase. Acid-Base Equilibrium Reactions SO 2(g) + H ... rates •Scaling in ME may ...

    • THE EFFECT OF ADDITIVES ON LIME DISSOLUTION RATES

      dissolution rate at higher pH, the dissolution of limestone at higher pH (>8) has not received much study. Though temperature is an important factor affecting limestone dissolution rate, very little effort has been made in determining the correlations under different conditions.

    • Rate models for limestone dissolution: A comparison ...

      Results of dissolution experiments, performed on a rotating limestone cylinder system, were used to test the ability of these two models to predict the dissolution rate of limestone in aqueous systems, where the mass transfer of the dissolving species is the rate limiting step.

    • Comparative study of dissolution rate-determining ...

      2005-10-18 · Control of CO 2 conversion reaction on dissolution rate. Figure 2 shows the dissolution rates versus ( P_{{{text{CO}}_{{text{2}}} }} ) for rotating speeds at 3,000 rpm and 100 rpm. Dissolution rates of both limestone and dolomite were strongly enhanced by addition of CA, which catalysed the CO 2 conversion reaction (Lindskog et al. 1971).To illustrate this characteristic more clearly, the ...

    • Dissolution Rate of Limestone for Wet Flue Gas ...

      Limestone dissolution rate was measured by a pH-stat method with CO(2) sparging and dissolved sulfite. The dissolution rate of limestone under these conditions was found to be controlled by mass ...

    • Pore-scale heterogeneous reaction rates on a dissolving ...

      2013-10-15 · An experimental study of calcite and limestone dissolution rates as a function of pH from −1 to 3 and temperature from 25 to 80 °C Chem. Geol., 151 ( 1998 ), pp. 19 - 214 Google Scholar

    • Dissolution rates of limestones of different sources ...

      Dissolution rates of limestones of different sources ...

    • Effects of salts on limestone dissolution rate in wet ...

      1993-11-1 · To understand how the dissolution rate of limestone used for absorbent in a wet flue gas desulfurization plant is affected by the soluble salts formed from hydrogen chloride gas in flue gas as well as from the impurities contained in the used raw material limestone itself, various limestone slurries ...

    • Freshwater biodissolution rates of limestone in the ...

      Dissolution rates in two freshwater karst systems were determined by using tablets of dense micrite-biopelmicrite Cretaceous limestone. Submerged limestone tablets in riverbeds were subjected to a natural gradient from complete darkness to direct sunlight. Higher light rates significantly (p < 0.05) increased the epilithic biomass of phototrophs and the overall dissolution rates, which were ...

    • Rate of Reaction of Limestone with Soils

      2021-3-12 · 40-60 mesh limestone, with a further significant increase from the 60-80 mesh fineness. In a more comprehensive study by White in 1917 (22) different degrees of fineness of limestone were evaluated by crop yield and car-bonate dissolution at the end of 3 years. The results with calcitic lime-stone …

    • CALCIUM CARBONATE DISSOLUTION RATE IN LIMESTONE …

      2012-8-10 · The rate of carbonate mineral dissolution from limestone was studied using a rotating disk apparatus and samples of limestone of varied composition. The purpose of this study was to determine the effect of limestone composition on the kinetics of carbonate mineral dissolution. The results are needed to improve the relationships used to design limestone contactors for long term operation.

    • Experimental Study on Limestone Dissolution in Acid ...

      The dissolution rate of limestone from two sources is studied. A mathematic model of dissolution rate is built and experimental data are fitted by the model. The experimental system and mathematic model is verified to be feasible for studying activity of limestone.

    • A LABORATORY INVESTIGATION OF THE RELATIVE …

      2008-3-6 · Dissolution rates for limestone samples were distinctly higher than rates for dolomite samples but the rate curves had sim-ilar shapes. Initial rates for limestones averaged 12.53 µmol m-2sec-1compared with 8.53 for dolomite. The limestone rates are comparable with those measured on single crystal calcite but the dolomite rates

    • (PDF) Six-year Record of Rate of Limestone Dissolution at ...

      Six-year Record of Rate of Limestone Dissolution at Three Sites in Gunung Rapat, Kinta Valley, Perak, Malaysia June 2006 Bulletin of the Geological Society of Malaysia 52:103-107

    • (PDF) Dissolution: Carbonate rocks

      dissolves rapidly, with initial rates of dissolution being roughly several 10 mmol cm 2 s 1. Its equilibrium concentration c eq with respect to calcium at 20°C in pure water is. 15.3×10 3 mmol ...

    • Field and laboratory experiments on high dissolution …

      2017-4-26 · dissolution rates of limestone in stream flow Hattanji Tsuyoshi, Ueda Mariko, Song Wonsuh, Ishii Nobuyuki, Hayakawa Yuichi S., Takaya Yasuhiko, Matsukura Yukinori journal or publication title Geomorphology volume 204 page range 485-492 year 2014-01 (C) 2013 Elsevier B.V.

    • Dissolution Rate of Limestone for Wet Flue Gas ...

      Dissolution rate of limestone for wet flue gas desulfurization in the presence of citric acid was measured by pH-stat method. It was found that limestone dissolution rate in the presence of citric acid was controlled by mass transfer. As can be seen from the experimental results, in the presence of citric acid, limestone dissolution rate ...

    • Rate models for limestone dissolution: A comparison

      The use of the film theory model for the dissolution of limestone has been compared with an empirical dissolution model based on the assumption of reaction rate control. Both dissolution models were developed for limestone-water systems. The film theory model consists only of well-known physical constants and bulk concentrations. However, the reaction control model requires three rate ...

    • Dissolution of limestone fractures by cooling waters ...

      2017-10-4 · heat transfer and limestone dissolution rates. Motivated by the relatively slow rate of aperture growth, our model simulates the evolution of fracture aperture, flow rate and temperature field as a sequence of quasi steady states, as in the solid-density asymptotics of Ortoleva et al. [1987] or quasi-stationary state assumption of Lichtner [1988].

    • Subsoil carbonate dissolution rates and their determining ...

      2020-11-3 · Subsoil carbonate dissolution is the drives of atmosphere CO 2 consumption, underground water alkalinity and karst landform. Specifically, the determining factors and corresponding dissolution models for subsoil carbonate dissolution rate (({text{R}}_{text{Carb}})) remain under-researched in various seasons and soil profiles in situ with standard limestone tablets.

    • Limestone dissolution in modeling of slurry scrubbing for ...

      The rate of calcium sulfite dissolution in slurry scrubbers and hold tanks for flue gas desulfurization affects SO/sub 2/ absorption, limestone utilization and sulfite oxidation. The dissolution rates of calcium sulfite were measured by the pH-state method.

    • 〈Research Reports〉 Dissolution rates of limestone …

      2017-4-25 · Dissolution rates of limestone tablets in a flow-through system: A laboratory experiment of the input solution. The output solutions had higher Ca concentration than the input solutions, although run A showed little difference between the input and output solutions. For all …

    • Dissolution rates of limestones of different sources

      The dissolution rates of the limestones were found to be controlled by the mass transfer of hydrogen ions with chemical reactions in the liquid film surrounding the limestone particle. The measured value of mass transfer coefficient increases with an increasing pH value …

    • A model for prediction of limestone dissolution in wet ...

      1997-9-1 · OSTI.GOV Journal Article: A model for prediction of limestone dissolution in wet flue gas desulfurization applications

    • How does weathering affect limestone?

      2021-8-31 · Weathering is the breakdown of rock by physical, chemical or biological processes. Limestone areas are predominantly affected by chemical weathering when rainwater, which contains a weak carbonic acid, reacts with limestone. This causes the limestone to dissolve. Carbon dioxide from the respiration of animals (and ourselves) is one cause of increased carbon dioxide in the atmosphere.

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