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The effect of a magnetic field on the crystallisation and morphology of CaCO3 in solution was investigated in the 25–80 °C temperature range. The samples were analysed …
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Study with Quizlet and memorize flashcards containing terms like A cube of some rock weighs 6 grams, and a same-sized cube of water weighs 2 grams. What is the specific gravity of this rock?, This very common carbonate mineral effervesces when it contacts dilute HCl. What mineral is it?, Which layer in the Earth has a composition similar to the granite shown in this photograph? …
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The adsorption capacity of magnetic calcite-based NC 0.5Fe–C-5 calcined at 500 °C was found to be superior (7.79 mg/g) to that of iron and calcite NPs (Fe 3 O 4 and C- NPs). The adsorption process was studied using response surface methodology (RSM).
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Multiple generations of calcite have been identified in the Weishan REE deposit (Wang et al., 2019), which show coexistence with different minerals such as K-feldspar, quartz, sulfates, carbonates, fluorides and sulfides.Fluid inclusions in the coexistent quartz have homogenization temperatures varying widely from ∼ 550℃ to ∼ 150℃ (Li et al., 2009, Lan et …
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It is therefore necessary to develop methods for mitigating CO 2 leakage to ensure its long-term storability. One of the proposed remediation measures to seal leakage zones is the use of microbes to induce precipitation of calcium carbonate (Phillips et al., 2016).Microbially induced calcite precipitation (MICP) is a new and sustainable technology which utilizes …
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—The process of crystallization and speed of ca lcium carbonate precipitation in superimposition of. electric and magnetic (magnetic and electric) fields was studied. The phenomenon of transformation of electrochemically formed calcite crystals into "bun dlelike" crystals of aragonite under the influence of magnetic field was found.
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Uses Calcite is the mineral component of limestone which is used primarily as construction aggregates, and in production of lime and cement. Limestone also is used in a variety of commercial applications including: road construction, riprap and jetty stone, filter stone, railroad ballast, poultry grit, mineral food, sugar processing, flux stone in steel production, glass …
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Calcite ores typically contain metal sulphide, silicate, or other calcium-containing impurity minerals, which can be removed by flotation. A tremendous amount of research has been performed on refining the flotation process for calcite ores and designing the reagents (specifically, collectors) to increase the efficiency of the process. Metal ...
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The effect of magnetic exposure on scale suppression was evaluated from measurements of the rate of deposit growth, the extent of the …
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inducing magnetic field and citric acid additive. The morphology of the resulting scale consisted of rhombohedral calcite, a flower structure of vaterite and a dumbbell form of aragonite. These …
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External magnetic fields were applied during the process of directional solidification to control the microstructural patterning of ceramic scaffolds formed by freezing colloidal mixtures of ...
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Calcite occurs in nature either as high-grade (with >75% calcite) or low-grade calcite ores (with <30% calcite). Generally, other carbonates, phosphate, silicate, and iron sulfide minerals are associated with calcite. Gravity, magnetic, and flotation separation are the most process normally applied for the beneficiation of calcite ores [8].
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In this study, fast controlled precipitation (FCP) and chronoamperometry (CA) methods were performed to evaluate the influence of the magnetic treatment at 0.70 T, upon the scale formation in synthetic …
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These results demonstrate the efectiveness of a magnetic field in reducing the adhesion of calcite to surfaces and thus its possible application in limiting the formation of scale in industrial …
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In this work, the copper oxide ore from Congo responded well to magnetic separation, for raw ore containing 1.50 % Cu of −2 mm size fraction, under magnetic separation under 1.5 T magnetic induction intensity, 3 mm rod matrix and 100 r/min pulsating, magnetic concentrate with 76.63 % Cu recovery and 8.60 % Cu grade was obtained, the content ...
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The crystal structure of scheelite belongs to the tetragonal system, with a space group of I4 1 /a and cell parameters of a = b = 0.5243 nm, c = 1.1376 nm, α = β = γ = 90°, and Z = 4 (Gao et al., 2016b).As shown in Fig. 1 (a), the complex anion in the crystal is a W–O 4 tetrahedron, formed by the combination of W 6+ and four O 2-and Ca 2+ ions, and the eight O …
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PDF | The enzyme urease drives the hydrolysis of urea leading to the release of ammonium ions and bicarbonate; in the presence of calcium, the rise in... | Find, read and cite all the research you ...
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The complete mechanism for this process has been described in recent work by Song et al. as being the result of dissolution of calcite and subsequent reaction with sulfate and copper, as ...
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Natural magnetic pyrite was purchased from Tongling City, Anhui Province. After crushing and screening, magnetic pyrite particles with sizes of 0.500–1.00 mm, 2.00–3.00 mm, and 5.00–10.0 mm were obtained.
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Superparamagnetic nano-particles have been entrapped within single crystals of calcite since they provide magnetic properties to the crystals that can be used for applications in which a physical separation by means of a magnetic field represents an advantage.5,36–38 The molecular external shell of nano-particles possessing a magnetic core ...
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calcite: HyPerCal - A new practice for micropaleontological and paleoclimatic proxies Stergios D. Zarkogiannis 1,2 *, George Kontak iotis 2, Georgia Gkaniatsa 2, Venkata S. C. Kuppili
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Calcite occurs in nature either as high-grade (with >75% calcite) or low-grade calcite ores (with <30% calcite). Generally other carbonate, phosphate, silicate, and iron sul-phide minerals are associated with the calcite ores. Gravity and/or magnetic separation and flotation are the beneficiation techniques most commonly applied to calcite ores ...
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Normally, two processes of solid formation by influencing nucleation (i.e., the first deposition process of calcite form) and crystal growth, are importantly considered to solve calcite formation problems. Hence, understanding the impact of magnetic fields on crystallization process of CaCO 3 is the key to solve this
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Calcite formation is a fascinating process that occurs both in geological environments and through biological activity. Its formation is essential in creating various geological structures and influencing natural processes.
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The results of current research into antiscale magnetic treatment at The School of Water Sciences: Cranfield University investigated magnetic effects on the crystallization behaviour of …
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A prerequisite for the industrial application of any chemical process is a thorough understanding of the reaction mechanisms and reaction kinetics. A likewise knowledge of the factors that determine the rate of dissolution of olivine in acids at elevated temperatures is essential for the design of an industrial plant for the neutralization of …
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Iron-rich calcite has an inverse magnetic fabric [Jacobs, 1963; Rochette, 1988], where the k1 axis coincides with the c axis of the calcite's crystal lattice. The calcite mylonites display CPO with c axes clustered perpendicular to the foliation and a axes distributed around a great circle subparallel to the main foliation.
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These results demonstrate the eectiveness of a magnetic eld in reducing the adhesion of calcite to surfaces and thus its possible application in limiting the formation of scale in industrial installations. Keywords Magnetic elds · Calcium carbonate · Precipitation · Morphology · Quantitative phase analysis · Rietveld method 1 Introduction
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The effect of a magnetic field on calcite crystal growth was studied by fixing permanent magnets, MagneGen Model 1000 or 100, outside the fluidized bed where the seed …
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For lithologies that are dominated magnetically by calcite, with a deficiency of secondary phases, magnetic susceptibility can be used to rapidly screen rock samples for the variation of paramagnetic trace elements Fe and …
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The focus of our research work was to follow systematically the influence of the magnetic field on the crystal form of calcium carbonate precipitated from low concentration …
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In general, precipitated calcium carbonate (PCC) is used as a mineral filler in paper industries; while natural calcite (CaCO3) ore is also suitable for industrial use if it is a finely ground high-grade material. Naturally, calcite is found in the form of high- or low-grade ores and it is one of the most widely distributed industrial minerals on the earth's crust. However, it is …
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Calcite is a low-cost, raw material with high commercial availability and it can be used without further modification. In a previous research (Psaltou et al. 2020a (Psaltou et al., 2020b, it was ...
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The crystal growth rates of calcite in a constant-composition environment were measured in the presence of a magnetic field.The magnetic effect to be influenced by any one of the solution variables, including pH, degree of relative supersaturation (σ), ionic strength (I), Ca 2+ to CO 3 2− ionic activity ratio (R), and superficial velocity (v), was investigated while …
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