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Calcium sulfate veins have been found in Gale crater and Endeavour crater as indicators of Martian fluid events. The presence of mixed-cation sulfates has been suggested because a wide variety of sulfates containing different cation elements have been detected in in-situ exploration targets (e.g., soils, drilled materials, calcium sulfate …
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Cetyl trimethyl ammonium bromide (CTAB), a chemical surfactant was used in different proportions in the present study. Some of its physical properties are summarized in Table 1.Calcium chloride [CaCl 2] and ammonium per sulfate [(NH 4) 2 SO 4] were the two precursors implied for the synthesis of nano-CaSO 4.Their reaction parameters which …
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The obtained fine biocompatible powders of calcium sulfate both after synthesis and after heat treatment at temperature not above 600 °C can be …
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high temperature, porous calcium carbonate, and an oxygen atmosphere as conditions. Those methods both need high temperatures. Thus, excessive energy consumption and environmental requirements pro-moted the exploration of novel and ecient methods for preparing anhydrous calcium sulfate whiskers. Calcium carbonate made up nearly 4% …
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Samples of conventional calcium sulfate-dihydrate (CS), nanoparticulate calcium sulfate (nCS) dihydrate form, nCS β-hemihydrate form and nCS α-hemihydrate form were analyzed using a S-4000 field emission scanning electron microscope (SEM). Electron beam energy of 10 kV was used. The samples were prepared by spreading powder
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In the absence of calcium sulfate, C 4 A 3 Ŝ reacts with water forming monosulfoaluminate (C 3 A·CŜ·12H; C 4 AŜH 12) (Winnefeld and Lothenbach, 2010). The formations of these two hydrates contribute different strength development with larger contribution from ettringite than from monosulfoaluminate ( Kaprálik and Hanic, 1989, …
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Calcium sulfate occurs in nature in form of three different minerals distinguished by the degree of hydration: gypsum (CaSO4·2H2O), hemihydrate (CaSO4·0.5H2O) and anhydrite (CaSO4).
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This study found that, without added succinic acid or aluminum ions, the crystal transformation rate of α-calcium sulfate hemihydrate reached 96% with the average length-diameter ratio reaching ...
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Calcium sulfate and calcium vanadate nanostructures have been synthesized by a hydrothermal route using calcium sulfate and sodium vanadate as the raw materials. The products were characterized by ...
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Here we report a facile and cost-effective wet-chemical approach to the synthesis of calcium sulfate hemihydrate nanowires (HH NWs, CaSO4.0.5H2O), and their robust performance in immobilizing ...
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vibration were identified andlinked to sulphate. The quality of the synthesized calcium sulphate shows similarity with the commercial reagent grade calcium sulphate. In conclusion, limestone waste could be a suitable material for making high quality calcium sulphate. KEYWORDS: Limestone waste, calcium sulphate, synthesis, mines, quality …
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Calcium sulfate hemihydrate, also known as bassanite or Plaster of Paris, is one of the most extensively produced inorganic materials worldwide. Nowadays, bassanite is mainly obtained by thermal dehydration of calcium sulfate dihydrate (gypsum) – a process that consumes considerable amounts of energy and thus leaves a significant …
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A high-purity and predictable calcium sulfate (CS) synthesis process is desirable in the medical industry. The objective of this study was to develop a one-pot method for the direct preparation of calcium sulfate hemihydrates (CSHs; such as the α- and β-forms) in a CaCl 2 solution.
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Calcium sulfate whisker (CSW) is a single-crystal fiber with an aspect ratio of 30–80 μm [1–3], and it has wide applications as insulating [], abrasive [5, 6], adsorbent [], coating [] and biomedical materials [9–11] due to its excellent properties such as high strength, non-toxicity, high chemical resistance, good thermal stability, low cost, and …
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From the EDX data obtained, it is clear that the ratio by atomic mass between Ca and S is approaching 1: 1 (wt.%: Ca — 11.40 ± 0.58; S – 11.92 ± 0.73), which proves that the resulting material from spent sulphuric acid and calcium carbonate is CaSO 4 ⋅ 2H 2 O.. The crystallization of calcium sulphate dihydrate has been subject of several studies on …
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Synthesis of precipitated calcium carbonateFollowing is a typical procedure for the synthesis of calcium carbonate, which was used in the investigation of the influence of sodium carbonate concentration. A quantity of 0.03 mol calcium sulfate dihydrate (Mallinckrodt, reagent) was added to 50 ml of DI water and then was heated to …
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For example, the calcium sulfate whiskers with a diameter of 1.0–3.0 μm, a length of 20–80 μm, and an aspect ratio of 10–50 were prepared from the non-sintered raw material, while calcium sulfate whiskers with a diameter of 0.2–0.8 μm, a length of 30–240 μm, and an aspect ratio of 180–360 were produced from sintered raw material.
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The past decades have witnessed great advances in nanotechnology since tremendous efforts have been devoted for the design, synthesis, and application of nanoparticles. …
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Herein, the feasibility of preparing long and homogeneous hemihydrate (HH) whiskers using waste oyster shell was investigated. The whiskers formed from the sintered raw material had higher aspect ratios and more uniform morphology than non-sintered. The effect of reaction temperature, reaction time, and concentration were investigated. It was found …
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33 rowsCalcium sulfate (CaSO 4), also known as plaster of Paris, is an osteoconductive crystalline substance used for bone void fillers and for cranial defects. ... The synthesis …
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This study aims to fabricate silk fibroin/calcium sulfate (SF/CS) composites by one-pot synthesis for bone regeneration applications. The SF was harvested from degummed silkworm cocoons, dissolved in a solvent system comprising of calcium chloride:ethanol:water (1:2:8), and then mixed with a stoichiometric amount of sodium …
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Herein, calcium sulfate has been successfully synthesized through a room-temperature microemulsion method. During the synthesis of nanosized calcium …
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the synthesis of nanosized calcium sulfate, three different types of surfactants have also been studied in this work such as TritonX-114, SDBS, and CTAB, shown in Scheme 1.
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Download scientific diagram | Conceptual flowsheet making use of magnesium sulphate crystallization and calcination to effect the regeneration of hydrochloric acid in a laterite leaching process ...
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Polyacrylamide-calcium carbonate (PAM/CaCO 3) and polyacrylamide-calcium sulfate (PAM/CaSO 4) nanocomposites were prepared via solution-mixing technique.The resulting PAM-based nanocomposites with various CaCO 3 and CaSO 4 nanoparticles contents (0–4% w/w) were investigated. Nanoparticles of CaCO 3 and …
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Calcium sulfate hemihydrate with different structures and morphologies has a broad scope of applications. Herein, we reported a strategy for nanosized calcium sulfate through room-temperature microemulsion by using calcium carbonate and sulfuric acid. After characterizations, it was indicated that the morphology of calcium sulfate products …
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The past decades have witnessed great advances in nanotechnology since tremendous efforts have been devoted for the design, synthesis, and application of nanoparticles. However, for most mineral materials such as calcium sulfate, it is still a challenge to prepare their nanoparticles, especially with uniform size and high monodispersity. In this …
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The preparation of calcium sulfate whisker (CSW) from waste PG could solve the large amounts of PG accumulation and substitute the plant-based pulp fiber, reducing the pollution of wastewater in paper and pulp industries. In this work, the CSW, which length could reach 230 μm, was fabricated from the PG in a glycerol-water solution.
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Synthesis Of Calcium Sulphate Flowsheet. Synthesis Of Calcium Sulphate Flowsheet Hyfinance is a largescale mining enterprise integrating R & D, production and sales Over the years, it has been committed to technological innovation of products and always provides the best technology to customers In more than 160 countries around the world, …
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A continuous countercurrent flow process for converting FGD gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the purity of reaction products while minimizing reaction times, and further include embodiments of the process that provide a yield of both ammonium …
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It was indicated that the morphology of calcium sulfate products fabricated could be changed and controlled using different surfactants TritonX-114, SDBS, and CTAB by the microemulsion method, a benefit for the synthesis of nanomaterials with special structures in the future. Calcium sulfate hemihydrate with different structures and …
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In Fig. 5b, the peaks at 16.77°, 20.59°, 23.04°, 28.57°, 47.02° corresponded to ammonium sulfate (JCPDS card- 01-073-6838). The XRD analysis confirmed that the major phase constituted of ammonium sulfate. FT-IR analysis. FT-IR analysis of natural gypsum and the product formed is shown in Fig. 6.The band near 3620 and 3400 cm −1 depicts …
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WEBCalcium sulphate (CaSO 4), one of biomaterial with high potential for dental and orthopedic applications due to its similarity to the mineral constituents of bone in the …
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X-ray diffraction (XRD) analysis was also employed for determining phase composition of products. A flow sheet of the process route is given in Fig. 2. Download : Download high-res image (257KB ... Additives-assisted hydrothermal synthesis of calcium sulfate whisker and its growth mechanism. J. Chin. Ceram. Soc., 42 (2014), pp. …
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Green Synthesis of Fluorescent Carbon Quantum Dots from Bagasse: Inhibition of Calcium Sulphate Scales. 27 Pages Posted: 9 Nov 2023. See all articles by Fang ming Yang Fang ming Yang. Nanjing Tech University. Duanzhi Li. Nanjing Tech University. Zhihao Chen. Nanjing Tech University.
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Abstract. The improved thermal resistance from the paint mixed with CaSO 4 whiskers on different substrates (i.e., concrete pillar, stainless steel foil, and calcium silicate plate) has been investigated. An efficient microwave-assisted method is used to synthesize CaSO 4 whiskers from wastewater. Experimental results reveal that the addition of CaSO …
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