Utilization of oil shale combustion wastes for PCC production: Quantifying the kinetics of Ca(OH)2 and CaSO4·2H2O dissolution in aqueous systems

Uibu, Mai; Tamm, Kadriann; Velts-Jänes, Olga; Kallaste, Priit; Kuusik, Rein; Kallas, Juha

doi:10.1016/j.fuproc.2015.09.010

Cited by 10 publications

(5 citation statements)

References 27 publications

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“…This implies that PF ash contains more compounds (Ca and Mg oxides) which ensure (dissolution of their hydrated forms) a fast basic reaction. This can also be seen from the reaction rate constants reported in Table 3, the value of the reaction rate constant for Equation (6) for the one-step (0.0282 s -1 ) pure Ca(OH) 2 dissolution model [41] matches with the rate constant (0.0294 s -1 ) for the PF ash system. The best accordance between OSA and ternary systems was achieved for k 61 for the PF ash-water system and for k 71 for the SHC ash-water system.…”

Section: Dissolution Kinetics In Os Ash-water Systemssupporting

confidence: 60%

Leaching Thermodynamics and Kinetics of Oil Shale Waste Key Components

Tamm¹,

Kallaste²,

Uibu³

et al. 2016

Oil Shale

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Estonia is strongly dependent on locally mined oil shale which is the main fuel for power and oil production. Vast amounts of solid wastes are formed from circulating fluidized bed (CFB), pulverized firing (PF), and solid heat carrier (SHC) technologies, and are currently wet deposited in open-air fields. Both the utilization of newly produced ash and the management of historical deposits require an accurate thermodynamic modelling of complex mixtures. The authors investigated the leaching of the main water-soluble Ca-compounds from three types of oil shale mineral waste and developed a kinetic model that was used to determine the equilibrium constants and kinetic parameters of dissolution reactions for all three ash-water systems over a wide range of solid-to-liquid (S/L) ratio. For this, we prepared binary (Ca(OH) 2-CaSO 4 •2H 2 O-H 2 O) and ternary (Ca(OH) 2-CaSO 4 •2H 2 O-CaSH 2 O) model systems that reflect the composition of the three different ashes, and measured the kinetics of dissolution for both the model systems and industrial ash. Thermodynamic calculations were performed using HsC Chemistry ® 7.1 and Aspen Plus V8.6 while the leaching kinetics was simulated employing the MODEST 6.1 software package. By comparing the results obtained for our model systems with those obtained for industrial oil shale ash-water systems the authors were able to both verify that the model results coincided to a satisfactory degree with simulation data, and also propose models that may aid one to design shale ash processing technologies.

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Section: Dissolution Kinetics In Os Ash-water Systemssupporting

confidence: 60%

Leaching Thermodynamics and Kinetics of Oil Shale Waste Key Components

Tamm¹,

Kallaste²,

Uibu³

et al. 2016

Oil Shale

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“…Changing different parameters indicated that increasing sample mass and gas flow rate accelerated and intensified the carbonation process as changing the mixing speed from 300 to 3000 rpm had negligible effect. A kinetic model built on Ca(OH)2 solubility [13] and carbonation [14] followed the experimental results for Ca(OH)2 content during carbonation but underestimated the carbonate content in solid phase. This is due to Ca-silicates that also contribute to CO2 binding but were not considered in this model.…”

Section: Results On Mineral Carbonationmentioning

confidence: 94%

Transport, Utilization and Storage of CO2 Emissions Produced by Cement Industry: CCUS Study of the CLEANKER Project

Shogenova

Uibu

Gastaldi³

et al. 2019

SSRN Journal

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“…Although the operating conditions reported in the literature differ slightly from ours, the rate constant of the forward reaction k f1 [kmol/m 5 ·h] was estimated via the following form The rate constant of the forward reaction k f2 [m 3 /kmol·h] was set to 1.958 × 10 2 , so that we could formulate the rate constants k f1 and k f2 corresponding to our conditions. However, the variation of these constants does not contribute to the results, and a similar study has shown that k f2 does not significantly affect the reaction rate.…”

Section: Aqueous Mineral Carbonation Process Designmentioning

confidence: 80%

Bayesian Optimization of Semicontinuous Carbonation Process Operation Recipe

Lee

Park

et al. 2021

Ind. Eng. Chem. Res.

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We develop a pilot-scale semicontinuous aqueous mineral carbonation process that captures 40 tons of CO 2 per day by combining a 20 wt % aqueous Ca(OH) 2 solution with flue gas containing 15 vol % CO 2 . From the pilot-plant operation recipe (the so-called "base case"), we propose two new operation recipes to minimize the quantity of reactant used (Lt) and maximize the replenishment period (Pr): a sequence including both a continuous and discrete flow (the so-called "continuous case") and one involving additional reactant replenishment (the so-called "buffer case"). A multiobjective Bayesian optimization was adopted to optimize the operation recipe and minimize the number of simulations. Compared to the base case, the two proposed recipes were found to prolong the Pr by factors of ∼12 and ∼2.4 with increases in Lt of ∼4.6 and ∼2.6%, respectively. We anticipate that the two proposed recipes will provide operational flexibility by extending the boundaries.

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Utilization of oil shale combustion wastes for PCC production: Quantifying the kinetics of Ca(OH)2 and CaSO4·2H2O dissolution in aqueous systems

Cited by 10 publications

References 27 publications

Leaching Thermodynamics and Kinetics of Oil Shale Waste Key Components

Leaching Thermodynamics and Kinetics of Oil Shale Waste Key Components

Transport, Utilization and Storage of CO2 Emissions Produced by Cement Industry: CCUS Study of the CLEANKER Project

Bayesian Optimization of Semicontinuous Carbonation Process Operation Recipe

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