Calcium carbonate (precipitated), EMPLURA®; CAS Number: 471-34-1; Synonyms: Calcium carbonate; Linear Formula: CaCO3 at Sigma-Aldrich ... We are a leading supplier to the global Life Science industry with solutions and services for research, biotechnology development and production, and pharmaceutical drug therapy development and production. ...
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The amount of precipitated calcium carbonate in the CCC depends on the production temperature. The highest amount of calcium carbonate precipitation in the CCC was found at 60–70 °C, followed by 80 °C, 50 °C, and 40 °C and lowest value was at 90 °C. Download: Download high-res image (217KB) Download: Download full-size image; Fig. A2.
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reverse of Eq. (3-4) represents the precipitation of calcium carbonate in the sea, as a cementing material in sedimentary rocks, or where droplets evaporate at the tip of a ... especially in the tropics, where the water is warm. Pressure. The effect of pressure by itself, independent of its effect on ... a base is added slowly to a solution ...
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Limit of magnesium and alkali salts— Mix 1.0 g with 35 mL of water, carefully add 3 mL of hydrochloric acid, heat the solution, and boil for 1 minute. Rapidly add 40 mL of oxalic acid TS, and stir vigorously until precipitation is well established.Add immediately to the warm mixture 2 drops of methyl red TS and then 6 N ammonium hydroxide, dropwise, until the mixture is just …
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Carbon exists in many forms in nature, the most important forms are carbonate and CO 2, which play an important role in the global carbon cycle.Carbonate deposition plays a decisive role in the formation and evolution of the global carbon cycle and geological process [1].The precipitation of calcium carbonate in seawater or lake water due to local …
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SEM of the calcium carbonate crystals precipitated in WSM solutions at different pH values revealed various crystalline structures, as shown in Fig. 4 A. For pH values ranging from 5.5 to 9.0, calcite and aragonite crystals precipitated synchronously at all ranges of pH, which is tremendously different from the results in the control group ...
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As an illustration of the effect of temperature, calcite dissolves at great depths in the ocean, where the water is perennially cold, but precipitates near the surface, especially in the tropics, where …
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The effects of pH and phosphate on the precipitation of calcium carbonate polymorphs from aqueous solution were investigated. Experiments were carried out at near-freezing temperature and two different pH conditions (pH 13.4 and 9.0). At each pH condition, solutions having different concentrations of CaCl2 and NaHCO3 were mixed to achieve Ca/CO3 ratios of 1:1 and 10:1 at …
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Discover APEX-VN's innovative solutions at Vietnam Plas 2024, featuring calcium carbonate, PVC compounds, and filler masterbatch for the rubber and plastics industries. Learn how our eco-friendly materials enhance product performance and reduce costs. Visit our booth and schedule a meeting to explore tailored solutions.
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In this paper, we report a novel approach for preparing precipitated calcium carbonate using solutions of ammonium carbamate and calcium acetate as the sources of …
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The precipitation of calcium carbonate was achieved by mixing equal volumes of calcium chloride and sodium bicarbonate supersaturated solutions prepared from the respective solids and standardized as described in detail elsewhere [36, 38]. The supersaturated solutions were introduced in homogeneously hydrophobic and hydrophilic, and ...
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The precipitation of CaCO 3, formed by mixing equimolar solutions of Na 2 CO 3 and CaCl 2 at different dilutions in aqueous solution, has been studied at 25°C. Induction periods were determined as functions of the initial supersaturation by different methods (visually, turbidimetrically and conductometrically) for the "pure" system and in the presence of Mg 2+, …
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The calcium carbonate (CaCO3) precipitation potential (CCPP) can predict the potential for corrosion and lime scaling in drinking water systems. CCPP can be calculated by different standards, but none of these consider all of the conditions in drinking water systems where temperatures can reach 100 °C and the water exchanges CO2 with the atmosphere. …
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Spontaneous precipitation by the mixing of two concentrated solutions of calcium and carbonate results in a gelatinous matter when the ionic activity product (IAP) exceeds the solubility product (K SP) of amorphous calcium carbonate (ACC) [14].This amorphous precursor is highly unstable and will transform into a mixture of the crystalline polymorphs within few …
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This review reports a critical study on the effect of magnetic fields on the precipitation process of calcium carbonate scale from hard water. Indeed, the harmful consequences of the water scaling phenomenon urged researchers to find effective solutions. One of the interesting antiscaling processes is the magnetic treatment of water, which triggers a reduction in the precipitation of …
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Milk of lime, precipitated calcium carbonate, morphology, particle size, carbonation. 1. Introduction Precipitated calcium carbonate (PCC) is a filler used in many applications, like papers, plastics, rubbers, paints, drugs and so on. Its high purity, well-ordered particle size and morphology makes it the white filler of choice.1 In paint ...
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Fig. 6 illustrates the pH trends observed in supersaturated calcium carbonate solutions, highlighting the buffering capacity of proteinoids. The introduction of proteinoids (10 mg) initially resulted in a significant decrease in pH, possibly attributed to the acidic properties of the carboxyl and amino groups present in the proteinoids ...
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In the present work, the effect of temperature and solution pH on calcium carbonate precipitation from iron-rich waters was investigated. Calcium carbonate was precipitated by CO 2 removal. The increase in the temperature …
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Factors Influencing Location. Several factors influence where limestone forms: Presence of Calcium Carbonate Source: Readily available dissolved calcium carbonate, either from seawater, freshwater, or weathering of carbonate rocks, is essential for limestone formation. Suitable Environmental Conditions: Warm, shallow marine environments favor the growth of calcifying …
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A spontaneous calcium carbonate precipitate was formed in the biomimetic calcium chloride solution as a result of the carbon dioxide hydration process. The reaction was conducted at different temperature range vary from 30°C to 100°C.
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Precipitated calcium carbonates are usually produced, either in the industries for commercial purpose or in the laboratory for research using two main methods: by the solid–liquid route, which involves a direct reaction between Ca 2+ and CO 3 2− in an aqueous solution (Kim et al. 2005; Kimura and Koga 2011), and the solid–liquid–gas route, where CO 2 is bubbled …
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In the present paper, precipitated calcium carbonate (PCC) has been produced from waste marble powder (WMP) by the Calcination-Dissolution-Precipitation (CDP) method.
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Calcium carbonate precipitated (≤ 0.002% Fe), EMPROVE® ESSENTIAL, Ph. Eur., BP, JP, USP, FCC; CAS Number: 471-34-1; Synonyms: Calcium carbonate; Linear Formula: CaCO3 at Sigma-Aldrich ... We are a leading supplier to the global Life Science industry with solutions and services for research, biotechnology development and production, and ...
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Torrent-Burgu~s b A. Ldpez-Macipe a R. Rodlqguez-Clemente a " Institut de Ci~ncia de Materials de Barcelona, CSIC, Campus de la UAB, 08193 Bellaterra, Spain b Departament d'Enginyeria Quimica, UPC C/Colom 1, 08222 Terrassa, Spain Abstract The precipitation of calcium carbonate from solutions with the same initial supersaturation and …
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The precipitation of calcium carbonate from solutions with the same initial supersaturation and different initial [Ca] T ([HCO − 3] + [CO 2− 3]) ratio, has been studied …
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In the present work, the effect of temperature and solution pH on calcium carbonate precipitation from iron-rich waters was investigated. Calcium carbonate was precipitated by CO 2 removal. The increase in the temperature or the solution pH leads to the acceleration of calcium carbonate nucleation and crystal growth.
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Recently, a precipitated calcium carbonate (PCC) production technology utilizing steel converter (basic oxygen furnace) slag as a calcium source, referred to as Slag2PCC, has been developed and demonstrated successfully by researchers at Aalto university together with their collaborators (Said et al., 2013, 2016; Mattila et al., 2014).
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Calcium carbonate, for example, is often found precipitating in proximity to hot springs. In contrast, carbon dioxide is more soluble in cold water than in warm.
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During calcium carbonate precipitation from hard waters, 3 anhydrous polymorphs are observed: calcite, vaterite and aragonite, calcite being currently the most thermodynamically stable form.
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A spinning disk reactor (SDR) was applied and tested successfully for precipitated calcium carbonate particles synthesis in liquid–liquid system which is poorly understood in literature. The proposed SDR reactor consists of a spinning disk rotating at 4000–16,000 rpm. The proposed SDR resulted in a high local supersaturation ratio due to the intense energy …
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The reaction temperature has no significant effect on polymorphism as well as particle size of calcium carbonate precipitated from solutions having concentration 1.25 M Ca 2+ and 1.25 M CO 3 2and reaction time of 30 min. ... Carbonate rocks usually are formed in area favoring biological activity, i.e., in shallow and warm seas, in areas with ...
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XANES spectroscopy measurements are presented for both solid calcium carbonate samples and aqueous supersaturated calcium carbonate solutions. In XANES spectroscopy, x-ray photons excite Ca core 1s electrons to valence states ( 25, 26 ), providing a spectral signature that reflects the structure of the first, second, and, to a lesser extent ...
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