An experimental study of gypsum dissolution coupled to CaCO3 precipitation and its application to carbon storage

Lei, Yu; Daniels, Leyla M.; Mulders, Josephina J.P.A.; Saldi, Giuseppe D.; Harrison, Anna L.; Liu, Li; Oelkers, Eric H.

doi:10.1016/j.chemgeo.2019.08.005

Cited by 28 publications

(14 citation statements)

References 92 publications

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“…When the content of carbonate minerals is high, excessive gypsum precipitation hinders the exposure and reaction of OM and other minerals. Gypsum has a low intrinsic permeability and may also provide a barrier layer for fluid migration when it fills natural and induced fractures in shale, as widely found in evaporite deposits . However, a previous study also noted that the in situ replacement of carbonate by gypsum could generate over 30 MPa crystallization pressure to induce shale microfracturing .…”

Section: Results and Discussionmentioning

confidence: 99%

Experimental and Numerical Studies on Oxidation–Acidification Interactions that Dominate Shale Stimulation with Persulfate

Liu

Yang

et al. 2022

Energy Fuels

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Shale–persulfate interactions commonly occur in shale hydraulic fracturing, but the interaction mechanism and its implications for shale matrix alteration remain poorly understood. In this study, interactions between shale collected from Yichang, Hubei Province, China, and persulfate were investigated with experiments and geochemical modeling. The results revealed that although significant gypsum precipitation offsets the mass loss caused by pyrite, kerogen, and carbonate dissolution, the enlargement of micropores in shale still occurred when treated with persulfate. Both Fourier transform infrared spectroscopy and water chemical analyses confirmed that pyrite was preferentially oxidized by persulfate and that aliphatic C–O or −COOH was generated in kerogen after the treatment with persulfate. The oxidation rate of pyrite was 1.82 × 10–4 mol·m–2·s–1 according to the numerical simulation results, which was 1.5-fold higher than kerogen. Calcite, dolomite, and chlorite were all favorable for kerogen oxidation by inhibiting decomposition and prolonging the life cycle of persulfate. Dolomite showed priority in promoting kerogen oxidation over calcite and chlorite. According to the geochemical simulation, the key components, including calcite, pyrite, kerogen, dolomite, chlorite, and gypsum, contributed to −42.9, −16.6, −4.9, −3.7, −5.1, and 61.1% of the total solid mass change, respectively.

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Section: Results and Discussionmentioning

confidence: 99%

Experimental and Numerical Studies on Oxidation–Acidification Interactions that Dominate Shale Stimulation with Persulfate

Liu

Yang

et al. 2022

Energy Fuels

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“…The peak at 134.6 eV is associated with Ca 5 (PO 4 ) 3 F. As for 133.4 eV, it indicates the existence of Ca 3 (PO 4 ) 2 , CaHPO 4 , and Ca-(H 2 PO 4 ) 2 . 49,50 Although the bulk phase of the prepared catalyst is crystallite gypsum, contaminants do exist as complex composites in the matrix of crystallite gypsum due to the impregnations, encapsulations, or co-precipitations. 51,52 In order to test the leachability of the catalyst during transesterification, the used catalyst after transesterification S2).…”

Section: Resultsmentioning

confidence: 99%

“…From Figure D,E, the binding energies of F (686.0, 685.4, and 688 eV) and Al (74.9 and 74.4 eV) are found to be associated with AlF 3 . , The binding energy of P shows multiple peaks (Figure E). The peak at 134.6 eV is associated with Ca 5 (PO 4 ) 3 F. As for 133.4 eV, it indicates the existence of Ca 3 (PO 4 ) 2 , CaHPO 4 , and Ca(H 2 PO 4 ) 2 . , Although the bulk phase of the prepared catalyst is crystallite gypsum, contaminants do exist as complex composites in the matrix of crystallite gypsum due to the impregnations, encapsulations, or co-precipitations. , In order to test the leachability of the catalyst during transesterification, the used catalyst after transesterification reactions was analyzed using ICP–OES via microwave wet digestions, and no significant elementary variations were observed indicating the steady state of these impurities in the prepared catalyst.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Catalyst from Phosphorous Rock Using an Improved Wet Process for Transesterification Reaction

Wang

Tang

Yusuf

et al. 2021

Ind. Eng. Chem. Res.

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Gypsum (CaSO4·2H2O) with active catalytic performance was prepared from phosphorous rock through an improved clean wet process. The impact of the preparation conditions was extensively analyzed to identify the statistical significance toward the compositions of the prepared gypsum and catalytic performances during the transesterification reaction. The prepared catalyst predominantly contains CaSO4 (93%) with contaminations of silica (5%), P2O5 (0.25%), Fe2O3 (0.52%), Al2O3 (0.24%), and TiO2 (0.12%). Heavy-metal oxides, that is, Cr2O3, PbO, and CuO, were not detected from the prepared catalyst. The contaminants in gypsum are in the form of complicated composites such as SiO2, (Na2, K2)SiF6, MgF2, AlF3, Ca5(PO4)3F, and Ca3(PO4)2. The significant operational parameters, namely, the crystallization temperature and duration toward the catalytic performance, were identified by ANOVA. The Brönsted acidic sites from the ionic S and O, which might be in the form of S–⃛O or SO as the surface functional groups, attribute to transesterification catalysis. The theoretical simulation suggests that different ionic sulfates might co-exist on the surface of crystallite gypsum. The transport of reagents to the surface of catalytic sites also plays an important role under the investigated experimental conditions. The reusability study indicates an approximate 10% deactivation after the reaction.

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“…Indeed, in situ AFM imaging has unraveled that coupled dissolution-crystallization reactions that involve calcite effectively remove pollutants like manganese [54], cadmium [37], lead [55], phosphate [56,57], and chromate [58] from aqueous solutions. Similarly, coupled dissolution-crystallization reactions that occur during gypsum-aqueous solution interaction can result in the sequestration of dissolved components like barium and strontium [59], lead [60], arsenate [61], phosphate [62,63], and carbonate [64] through their immobilization in the structure of new phase.…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb from Water: The Effectiveness of Gypsum and Calcite Mixtures

2021

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Anthropogenic lead pollution is an environmental problem that threatens the quality of soils and waters and endangers living organisms in numerous surface and subsurface habitats. Lead coprecipitation on mineral surfaces through dissolution-recrystallization processes has long-term effects on lead bioavailability. Gypsum and calcite are among the most abundant and reactive rock forming minerals present in numerous geological settings. In this work, we studied the interaction of slightly acidic (pHi = 5.5) Pb-bearing aqueous solutions ([Pb]i = 1 and 10 mM) with crystals of gypsum and/or calcite under atmospheric conditions. This interaction resulted in a reduction of the concentration of lead in the liquid phase due to the precipitation of newly formed Pb-bearing solid phases. The extent of this Pb removal mainly depended on the nature of the primary mineral phase involved in the interaction. Thus, when gypsum was the only solid phase initially present in the system, the Pb-bearing liquid-gypsum interaction resulted in Pb removals in the 98–99.8% range, regardless of [Pb]i. In contrast, when the interaction took place with calcite, Pb removal strongly depended on [Pb]i. It reached 99% when [Pb]i = 1 mM, while it was much more modest (~13%) when [Pb]i = 10 mM. Interestingly, Pb-removal was maximized for both [Pb]i (99.9% for solutions with [Pb]i = 10 mM and 99.7% for solutions with [Pb]i = 1 mM) when Pb-polluted solutions simultaneously interacted with gypsum and calcite crystals. Despite the large Pb removals found in most of the cases studied, the final Pb concentration ([Pb]f) in the liquid phase was always well above the maximum permitted in drinking water (0.01 ppm), with the minimum ([Pb]f = 0.7 ppm) being obtained for solutions with [Pb]i = 1 mM after their interaction with mixtures of gypsum and calcite crystals. This result suggests that integrating the use of mixtures of gypsum-calcite crystals might help to develop more efficient strategies for in-situ decontaminating Pb-polluted waters through mineral coprecipitation processes.

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An experimental study of gypsum dissolution coupled to CaCO3 precipitation and its application to carbon storage

Cited by 28 publications

References 92 publications

Experimental and Numerical Studies on Oxidation–Acidification Interactions that Dominate Shale Stimulation with Persulfate

Experimental and Numerical Studies on Oxidation–Acidification Interactions that Dominate Shale Stimulation with Persulfate

Preparation of Catalyst from Phosphorous Rock Using an Improved Wet Process for Transesterification Reaction

Removal of Pb from Water: The Effectiveness of Gypsum and Calcite Mixtures

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