Crystallization kinetics of calcium carbonate at a stoichiometric ratio of components

Почиталкина, И. А.; Kekin, P. A.; Морозов, А. Н.; Petropavlovskii, I. A.; Kondakov, D. F.

doi:10.1134/s0036024416120232

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…We assumed that its behavior in concentrated NaCl solution is similar to calcium and summed up their concentrations. Literature data, especially the paper [ 65 ], indicate that CaCO 3 solubility is extremely dependent on pH and CO 2 pressure and can differ by orders of magnitude [ 66 , 67 ]. There are several reported data on the phase diagram CaCO 3 -NaCl-H 2 O at room temperature, but to our best knowledge, no comprehensive study on the solubility of CaCO 3 in saturated NaCl solutions at elevated temperatures was reported.…”

Section: Resultsmentioning

confidence: 99%

Operation of Three-Stage Process of Lithium Recovery from Geothermal Brine: Simulation

et al. 2021

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Lithium-rich geothermal waters are considered as an alternative source, and further concentration of lithium is required for its effective recovery. In this work, we have simulated a three-stage lithium recovery process including the brine softening by precipitation Ca2+/Mg2+ cations with sodium carbonate (calculated in PHREEQC), followed by an integrated system consisting of membrane distillation unit (water evaporation), crystallizer (NaCl precipitation), and membrane extraction (Li+ recovery), which was simulated in Simulink/MATLAB. It was shown that the deterioration of membrane performance in time due to scaling/fouling plays a critical role in the performance of the system resulting in the dramatic increase of the replaced membrane modules by a factor of 5. Low cost membranes are required. The process simulation based on the experimental and literature data on the high salinity solutions with the membrane distillation revealed that the specific productivity can be achieved in the range of 9.9–880 g (Li+) per square meter of membranes in the module used before its replacement. The increase of energy efficiency is needed. The mass-flow-rate of saline solution circulated to the crystallizer was set at its almost minimum value as 6.5 kg/min to enable its successful operation at the given parameters of the membrane distillation unit. In other words, the operation of the integrated system having 140 kg of saline solution in the loop and a membrane module of 2.5 m2 for concentration of lithium presence from 0.11 up to 2.3 g/kg would be associated with the circulation of about of 259 tons of saline solution per month between the distillation unit (60 °C) and the crystallizer (15 °C) to yield of up to 1.4 kg of lithium ions. The comprehensive summary and discussion are presented in the conclusions section.

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Section: Resultsmentioning

confidence: 99%

Operation of Three-Stage Process of Lithium Recovery from Geothermal Brine: Simulation

et al. 2021

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“…Most of the vaterite nucleation data [31,42,55,59,62] are grouped together, but they do not entirely agree. Mannoli expedited the transfer of gaseous CO 2 into the liquid and shows, similar to the studies that did this for growth, higher rates and should therefore not be considered for determining the nucleation parameters.…”

Section: Kinetics Of Nucleationmentioning

confidence: 98%

“…As with the growth kinetics, several publications [20,58,60,61] were disregarded either because the volume of the solution was not reported, or the solution composition was insufficiently described. Fortunately, this leaves plenty of other publications where nucleation rates can be correlated with the solution composition [31,38,42,[55][56][57]59,62]. The experimental conditions and nucleation type are summarized in Table 3.…”

Section: Kinetics Of Nucleationmentioning

confidence: 99%

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Review and Recalculation of Growth and Nucleation Kinetics for Calcite, Vaterite and Amorphous Calcium Carbonate

Bergwerff

Paassen

2021

Crystals

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The precipitation of calcium carbonate is well studied in many fields of research and industry. Despite the fact that, or perhaps because of the fact that, it is well studied in many fields, different approaches have been used to describe the kinetics of the precipitation process. The aim of this study was to collect and compare the data available in the literature and find a consistent method to describe the kinetics of growth and nucleation of the various polymorphs of calcium carbonate. Inventory of the available data showed that a significant number of the literature sources were incomplete in providing the required information to recalculate the kinetic constants. Using a unified method, we obtained a unique set of parameters to describe the kinetics for growth for calcite, vaterite and amorphous calcium carbonate (ACC) and nucleation for vaterite and ACC. Recalculation of the kinetic constants demonstrated that calcite confirmed there are two growth mechanisms within one polymorph, namely pure spiral growth and spiral growth mixed with surface nucleation. The spiral growth does not show second-order growth, which is typically attributed to it. Re-evaluation of the available nucleation data confirmed the suggested existence of a second pure ACC polymorph with a solubility product between 10−5.87 and 10−5.51 mol2 kgw−2.

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Study of the crystallization process of low-soluble compounds using laser analyzers

Почиталкина

Kekin

Kovalenko

2020

2020 International Conference Laser Optics (ICLO)

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Crystallization kinetics of calcium carbonate at a stoichiometric ratio of components

Cited by 5 publications

References 8 publications

Operation of Three-Stage Process of Lithium Recovery from Geothermal Brine: Simulation

Operation of Three-Stage Process of Lithium Recovery from Geothermal Brine: Simulation

Review and Recalculation of Growth and Nucleation Kinetics for Calcite, Vaterite and Amorphous Calcium Carbonate

Study of the crystallization process of low-soluble compounds using laser analyzers

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