Calcite has a higher carbon dioxide uptake efficiency and lower cost than dunite, and it is a preferable material for enhanced benthic weathering as a carbon dioxide removal …
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The endotherms associated with calcium hydroxide and calcite decreased with time (Fig. 5 a and 5b), indicative of continuing reaction which led to increased contents of C-A-S-H, ettringite, carboaluminates and hydrotalcite. Limestone appeared to have had no measurable influence on the C-A-S-H and ettringite endotherms in the sulphate-containing ...
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We conducted a laboratory experiment with two soils, one containing calcite and one without calcite to study how calcite affects soil carbon dioxide. Our results show that …
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Calcite is known for its distinct physical properties, which contribute to its identification and utility in various applications. Here are some of the key physical properties of calcite: 1. Color and Transparency:Calcite can occur in a wide range of colors, including colorless, white, gray, yellow, green, blue, and even …
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Reduction of the calcination temperature to 700 °C reduces the calcite decomposition and the negative impact on reactivity. BET specific surface area versus calcination temperature for materials ...
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Impact of temperature and pH on calcite inhibition using innovative green scale inhibitors. ... Waterflooding, conventionally by the use of seawater, is generally known as an efficient approach in enhanced/improved oil recovery (EOR/IOR) processes [1], [2]. ... For instance, as per impact of temperature, the efficiency of conventional scale ...
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Calcite water, also known as hard water, can have various effects on your plumbing system, appliances, and even your health. Fortunately, there are several treatment …
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1. Introduction. Waterflooding, conventionally by the use of seawater, is generally known as an efficient approach in enhanced/improved oil recovery (EOR/IOR) processes [1], [2].However, scale formation may profoundly undermine the performance of waterflooding which would cause substantial deterioration in production rate, equipment damage, serious safety …
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Experimental and theoretical investigation of the impact of crude-oil on the wettability behavior of calcite and silicate due to low salinity effect. ... the use of LSWF does not always result in an improvement in oil recovery [6], [7]. The success of LSWF also depends on the injected brine composition [8], [9], rock composition [10–13], rock ...
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We examine the impact of early marine calcite cementation on the evolution of porosity and permeability in carbonate grainstones. For that purpose we develop a 3D model that implements syntaxial cement growth on monocrystalline grains and isopachous cement growth on polycrystalline grains. We generate cemented samples based on a real carbonate ...
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Impact of the Mg-calcite formation pathway on its Mg content and Mg isotope fractionation. A striking feature of our results is that Mg-calcite formation pathway – via an amorphous precursor or during direct precipitation – has a profound impact on the temporal evolution of the Mg content and isotope composition of the reacting fluids and ...
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The results indicate that as the contents increased of calcite in coal, the weight loss decreased slightly, from 20.5% to 17.0%, and the burn-off raised obviously, from 54.1% to 90.4%, which is mainly because the calcite's catalytic impact during activation (Bai et al., 2023). The yield shows a reduction trend, from 36.5% to 8.1% naturally, in ...
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In the field, raw clays are often mixed with calcite and this is thought to affect their behaviour after calcination. This study explores the influence of calcite impurities on the mineralogy and reactivity a kaolinitic clay. …
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The impact of gangue content on flotation recovery was investigated by varying the ratio of apatite mass to calcite mass in mixed minerals. The findings revealed that as the calcite content increased, the separation efficiency of gypsum to apatite, which was calculated using equation (3), decreased from 36.7 to 3.19.
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Considering the thermodynamic advantage that FA possesses over other immobilized forms of F, the following objectives were identified for this study: (1) to evaluate the impact of phosphate and calcite amendments on elevated F concentrations in ultrapure water at room temperature; (2) to identify the underlying mechanisms of F uptake due to ...
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The motivation behind this work is to evaluate the impact of nano-magnesium calcite (NMC) waste on the performance of cement mortar (CM) and its resistivity to sulfate attack. The addition of urea and urease enzyme to ground water resulted in the removal of Ca 2+ and Mg 2+ as NMC precipitate (byproduct of treatment process). As a beneficial ...
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Impact of microbially induced calcite precipitation (MICP) on hydraulic conductivity of coarse sands Authors Seung-Hun Baek; Tae-Hyuk Kwon; Jason T. DeJong Published In. 20th International Conference on Soil Mechanics and Geotechnical Engineering (Sydney) Theme. TC308. Download PDF. International Society for Soil Mechanics and Geotechnical ...
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A better understanding of the detailed dissolution mechanisms in carbonate rock by CO 2 – brine systems is of great fundamental and applied interest. Applications include field scale operations in carbonate reservoirs such as CO 2 sequestration (Molins et al., 2012), where the acid is formed by dissolution of the injected CO 2 in the brine present in the reservoir; and …
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Scale risk was assessed by calcite changes around the wells, precipitation in well tubing and surface facilities, and water breakthrough. Results of this study showed that values of calcite rate constant (K sp) and reactive surface area (A 0) assigned in numerical simulations can impact relative calcite changes in the reservoir. Using reactive ...
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Continuous desorption experiment and impact of Mn coating on calcite dissolution In order to investigate the Mn desorption rate, column B (Fig. 1) was fed with Milli-Q water for 120 h and samples were collected from two sampling points located at different heights and therefore representing increasing EBCTs (i.e. 10 and 20 min). In addition ...
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The results showed that calcite dissolution increases the concentration of Ca 2+ in high salinity brine by 6.0 × 10 − 5 mol (a 0.56% increase) and in low salinity brine by 1.16 × 10 − 4 (a 9% increase). This level of calcite dissolution may inadvertently alter surface roughness and causes pH rise during contact angle tests.
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The alterations in δ 18 O and δ 13 C caused by the aragonite-to-calcite transformation in stalagmites have been investigated in our previous work (Zhang et al., 2014). However, it is essential to scrutinize the potential impacts of aragonite-to-calcite transformation on trace element compositions of stalagmites, which have been employed as important …
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The impact of the substitution of carbonate groups by sulfates in magnesian calcite on the Mg isotope composition of the solid can be approached by a comparison of the Mg-O bond lengths in Mg-calcite and Mg-sulfate salts (e.g. epsomite, MgSO 4 …
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To analyze the impact of calcite addition on the spontaneous combustion process of coal, a Python script was utilized to extract the data on the major products and oxygen (O 2) yield from the ReaxFF combustion simulations in the temperature range of 300–3000 K.
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Calcite (CaCO 3), a common component of calcium-based fertilizers, has been recognized for its effectiveness as a cadmium (Cd) immobilization agent in the …
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We develop and introduce a calcite module in a coupled one-dimensional physical-biogeochemical model that we use to simulate the carbon cycle of the large Lake Geneva over the past 40 years. ... DIC, and P co 2 and meets the essential criteria for its use in studying the impact of CP on carbon fluxes. Further attempts may encounter similar ...
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In 2023, an American market analysis demonstrated that the use of calcite crystals as a natural exfoliant and skin-brightening agent has been gaining widespread popularity, even as stabilizers for ...
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This study investigated the impact of calcite grains on the mechanical behavior of coal. A grain-breakable FDEM model was constructed based on the mineral composition data of the coal containing calcite grains. The model was calibrated to experimental results, and then triaxial compression tests with different confining pressures were conducted ...
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Specifically, calcite (CaCO 3) use for immobilizing Cd has been prominent due to its efficiency in diminishing both the bioavailability and mobility of Cd in soil [16, 17]. This method lowers the risk of Cd absorption by crops and contributes to maintaining soil fertility and promoting agricultural sustainability.
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A series of experiments were conducted at 600 ppm (˜3xCMC) of SDBS to evaluate the impact of individual ions on the wettability response of the calcite surface upon exposure to surfactant solution. In such treatment, there is a complex interplay between rock/adsorbed oleic acids/SDBS/ions.
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Degassing of CO 2 and precipitation of calcite to the surface of stalagmites can strongly impact isotope signals imprinted into the calcite of these speleothems. Here, we show that in all the variety of conditions occurring in nature only two distinct types of degassing exist. First, when a thin film of calcareous solution comes in contact to cave air, which has a lower p …
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