Structure, genesis and resources efficiency of dolomite: New insights and remaining enigmas

Cai, Wen Kai; Liu, Jia Hui; Zhou, Chun Hui; Keeling, John; Glasmacher, Ulrich A.

doi:10.1016/j.chemgeo.2021.120191

Cited by 33 publications

(7 citation statements)

References 239 publications

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“…Dolomite analogs have a similar structure to dolomite, as shown in Figure 11 [36]. It is known that the structure of norsethite (BaMg(CO 3 ) 2 )/PbMg(CO 3 ) 2 changes from that of the normal dolomite due to the larger ions at the A-site [37]. Specifically, since the ionic radius of Ba 2+ /Pb 2+ is larger than that of Ca 2+ , the coordination number of its A-site cations has been changed from the original 6 coordination number of Ca 2+ to the 12 coordination number of Ba 2+ /Pb 2+ (6 + 6), with six nearer oxygen atoms and six more distant oxygen atoms to form two octahedra with different Ba-O bond lengths, respectively.…”

Section: Mechanisms Discussionmentioning

confidence: 92%

Mechanochemical Synthesis of Dolomite-Related Carbonates—Insight into the Effects of Various Parameters

Jiang,

Wang,

Chen

et al. 2023

Minerals

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The low-temperature formation of dolomite (CaMg(CO3)2) is undoubtedly a long and interesting geological problem, which has troubled many researchers for centuries to explore the formation of dolomite. Recently, efforts have been made by synthesizing dolomite analogues such as norsethite (BaMg(CO3)2), PbMg(CO3)2, with Ba and Pb to replace Ca and investigating their reaction pathways. In this study, we reported our efforts to synthesize dolomite-related complex carbonates by using the mechanical ball milling method as a new approach to control the solid–water ratio compared to the commonly used solution method. Two analogues of norsethite and PbMg(CO3)2 have been simply obtained even at stoichiometric molar ratio of Ba/Mg = 1:1 and Pb/Mg = 1:1 with various parameters examined; and product properties including morphology and phase compositions were investigated by a range of techniques, including XRD, SEM-EDS, and FTIR. Finally, we attempted to synthesize dolomite and compared the differences from the synthesis of analogues. In conclusion, we have synthesized norsethite and PbMg(CO3)2 in one step by the ball milling method, which greatly reduces the reaction time compared with the conventional solution method and may provide other choices for the formation of dolomite.

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Section: Mechanisms Discussionmentioning

confidence: 92%

Mechanochemical Synthesis of Dolomite-Related Carbonates—Insight into the Effects of Various Parameters

Jiang,

Wang,

Chen

et al. 2023

Minerals

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“…It finds applications in the production of refractory materials, mineral fertilizers, cement, and ceramics. The characteristics of ground dolomite depend on its chemical composition, microstructure, texture, and porosity [59,60]. The dolomite used in the experiment was purchased from Biovita Sp.…”

Section: Dolomite Characteristicsmentioning

confidence: 99%

“…This could contribute to creating more favorable conditions for plant growth and influence the increased availability of nutrients. According to studies by Vasilyeva et al [59], Marwa et al [52], Balidakis et al [57], Szadkowski et al [55], and Jafari et al [56], vermiculite may enhance soil aeration and contribute to improved water retention, which is crucial for root growth and development.…”

Section: The Biomass Of Zea Mays and Its Energy Valuementioning

confidence: 99%

Soil Enzyme Response and Calorific Value of Zea mays Used for the Phytoremediation of Soils Contaminated with Diesel Oil

Borowik,

Wyszkowska,

Zaborowska

et al. 2024

Energies

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Ensuring a stable and cost-effective energy supply is a major challenge for the International Energy Agency (IEA). Additionally, the effectiveness of vermiculite and dolomite in mitigating the adverse effects of diesel oil, a petroleum-derived product, on plant growth and development, and on the biochemical activity of the soil, were assessed. Therefore, an attempt was made in the study to determine the energy properties of Zea mays, which is suitable for cultivation in contaminated areas. For these purposes, several parameters were analyzed in its biomass, including calorific value (Q), heating value (Hv), energy yield (Yep), ash content, and the presence of carbon (C), hydrogen (H), sulfur (S), nitrogen (N), and oxygen (O). Biochemical activity was measured through the evaluation of soil enzymes serving as indicators for the carbon (dehydrogenases, catalase, β-glucosidase), nitrogen (urease), sulfur (arylsulfatase), and phosphorus (acid and alkaline phosphatase) cycles. The plant greenness index was also determined. It has been demonstrated that diesel oil does not alter the calorific value of Zea mays biomass but significantly reduces the biomass quantity and destabilizes the biochemical properties of the soil. Zea mays contained an average of 6.84% ash, 49.88% C, 5.65% H, 0.17% S, 2.90% N, and 34.57% O. The calorific value of Zea mays ranged from 15.02 to 15.54 MJ kg−1 d.m. of plants, and the heating value ranged from 18.25 to 19.21 MJ kg−1 d.m. of plants. The biomass obtained from contaminated soil is recommended for energy purposes. The sorbents used—vermiculite and dolomite—proved to be less effective in the remediation of soil contaminated with diesel oil.

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“…Analysis of the XRD pattern shows that the crystal structure of dolomite is different from that of calcite. The ordered dolomite has superlattice XRD reflections [e.g., (101), (015) and (021)] (Figure 2a) [5,42,43]. The ratio of the diffraction intensity of the (015) crystal plane to that of the (110) crystal plane is used to calculate the degree of cation ordering in dolomite [δ = r (015)/r (110)] [44].…”

Section: Dolomite Mineralogy 21 Calcite and Dolomitementioning

confidence: 99%

Thermodynamic and Kinetic Studies of Dolomite Formation: A Review

Chen,

Zhong,

Wang

et al. 2023

Minerals

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The “dolomite problem”, which has confused scientists for nearly two centuries, is an important fundamental geological problem. The mineralogical characteristics of carbonate minerals show that the dolomite structure consists of an ordered arrangement of alternating layers of Ca2+ and Mg2+ cations interspersed with CO32− anion layers normal to the c-axis. The dolomite structure violates the c glide plane in the calcite structure, which means that dolomite has R3¯ space group symmetry. The ordered dolomite has superlattice XRD reflections [e.g., (101), (015) and (021)], which distinguish it from calcite and high-Mg calcite. The calculation of thermodynamic parameters shows that modern seawater has a thermodynamic tendency of dolomite precipitation and the dolomitization reaction can be carried out in standard state. However, the latest thermodynamic study shows that modern seawater is not conducive to dolomitization, and that seawater is favorable for dolomitization in only a few regions, such as Abu Dhabi, the Mediterranean and the hypersaline lagoons in Brazil. The kinetic factors of dolomite formation mainly consist of the hydration of Mg2+, the presence of sulfate and the activity of carbonate. Current studies have shown that the presence of microorganisms, exopolymeric substances (EPS), organic molecules, carboxyl and hydroxyl functional groups associated with microorganisms and organic molecules, clay minerals with negative charges and dissolved silica facilitate magnesium ions to overcome hydration and thus promote Mg2+ incorporation into growing Ca-Mg carbonates. Similarly, the metabolic activity of microorganisms is conducive to the increase in alkalinity. However, the inhibitory effect of sulfate on dolomite formation seems to be overestimated, and sulfate may even be a catalyst for dolomite formation. Combining the carbonate crystallization mechanism with thermodynamic and kinetic factors suggests that the early stage of dolomite precipitation or the dolomitization reaction may be controlled by kinetics and dominated by unstable intermediate phases, while metastable intermediate phases later transform to ordered dolomite via an Ostwald’s step rule.

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Structure, genesis and resources efficiency of dolomite: New insights and remaining enigmas

Cited by 33 publications

References 239 publications

Mechanochemical Synthesis of Dolomite-Related Carbonates—Insight into the Effects of Various Parameters

Mechanochemical Synthesis of Dolomite-Related Carbonates—Insight into the Effects of Various Parameters

Soil Enzyme Response and Calorific Value of Zea mays Used for the Phytoremediation of Soils Contaminated with Diesel Oil

Thermodynamic and Kinetic Studies of Dolomite Formation: A Review

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