The most optimum processing parameters for pure II-CaSO4 powder formation is calcined at 500 °C, and the FESEM observation shows that increasing calcination temperatures will contribute to the change of morphology of the CaSO4 Powder as well as its particle size due to necking effect. Calcium sulphate (CaSO4), one of biomaterial with high potential for dental …
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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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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 …
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Synthesis and characterization of nanocrystalline calcium sulfate for use in osseous regeneration To cite this article: Young Bum Park et al 2011 Biomed. Mater. 6 055007 View the article online for updates and enhancements. Related content Preclinical safety and efficacy evaluation of BioCaS bioactive calcium sulfate bone cement
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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 recommended as a filler for producing unique ...
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Calcium sulfate dihydrate was synthesized by calcium chloride solution reacted with sodium sulphate solution at a theoretical molar ratio [43]. The morphology of calcium sulfate dihydrate was shown in the section of results and discussion. The resultant calcium sulfate dihydrate was washed by pure water, followed by drying in a vacuum freeze dryer.
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Based on the synthesis process and modification technology of calcium sulfate, the two key factors for the synthesis of anhydrous calcium sulfate were the microenvironment and reaction temperature. In this work, TritonX-114 was used as a surfactant, which was a common non-ionic surfactant. There were no other charged groups on the surfactant ...
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CaCl 2 solution of desired concentration was prepared using water as a solvent. The natural rheology modifier was then added into the solution. Temperature of the solution was maintained as per the requirement. Sulphuric acid was added slowly at the vortex of CaCl 2 solution under fixed agitation. Stoichiometric amount of sulphuric acid was added for the …
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The as-obtained calcium sulfate can be used in many fields, such as pigments in paper coating and adsorbents in environment (Maria et al., 2012, Kumar et al., 2012). ... Synthesis and application of calcium sulphate pigment for paper coating: Potential and prospects. Powder Technol., 218 (2012), pp. 40-45.
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In this study, zinc-sulfate-calcium-phosphate (ZSCAP) ceramics was prepared by calcination in the presence of microwave irradiation using precursors ZnSO 4:ZnO:CaO:P 2 O 5 in a ratio of 15:30:30:25 (by weight). The calcined ZSCAP ceramics was mixed with microcrystalline cellulose and it was further heated by microwave radiation for the preparation of cellulose/ZSCAP …
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The agitation sulphuric acid leaching method was used at atmospheric conditions to synthesis of CSA powder that was pressed as green body pellets for sintering procedure at a temperature …
WhatsApp: +86 18221755073When equal amounts of CaCl 2 and Na 2 SO 4 solutions were mixed, calcium sulfate hemihydrates could only be synthesized at temperature above 130 °C [52]. In contrast, in this chemical surfactant templating route, the temperature needed for the synthesis of calcium sulfate is much lower (i.e., 30 °C).
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The Calcium Carbonate is removed ... The ammonium sulphate solution is concentrated in vacuum evaporators, crystals are . removed by ... Exo-thermic synthesis of ammonium carbamate with its ...
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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% of the
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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, Mehta and ...
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Methods obtaining gypsum whiskers via calcining dihydrate or hemihydrate gypsum perform high energy consumption. It also performs potential environmental impacts. New methods with energy-saving, high-efficiency, and environmentally friendly perform great challenges, which aim at fabricating gypsum whiskers even nanowhiskers. In this study, we used high …
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3D hierarchical flower-like calcium sulfate microspheres (CSMs) were prepared by a simple one-pot method with CaCl 2 and Na 2 SO 4 as the raw materials. Crystal shape guides leading to complex crystal morphologies (PEG, TSC, and PAA) were adsorbed on the surfaces of the calcium sulfate crystals, causing differences in the growth rates of the different crystal …
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Abstract. Calcium sulfate nanorods, nanowires, nanobelts and sheets had been synthesized via a facile solution reaction of CaCl2 and H2SO4 in mixed solvents of ethanol/N, N …
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As a byproduct of the industrial synthesis of phosphoric acid, there was a large quantity of phosphor gypsum (PG) accumulation, which needs enormous storage space and endangers the environment. The preparation of calcium sulfate whisker (CSW) from waste PG could solve the large amounts of PG accumul …
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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 veins, and sandstones).
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The conversion of biomass waste generated in large amounts to value-added materials and energy can reduce environmental pollution, atmospheric CO 2 emissions and waste disposal costs in a circular economy. Chemicals, such as strong acids and organophosphates, commonly used for industrial water treatment, are harmful and cause environmental pollution.
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The Synthesis and Analysis of Calcium Sulfate When solutions of sodium sulfate and calcium chloride dihydrate react, they produce an insoluble precipitate of calcium sulfate. Na 2SO …
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Direct preparation of α-calcium sulfate hemihydrate out of sulfuric acid solution by reaction with lime under atmospheric pressure conditions is systematically investigated.
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Preparing calcium sulfate whisker (CSW) from FGD gypsum by hydrothermal synthesis is considered to be a promising approach to solve this troublesome problem and …
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In this work, we successfully synthesized nanofibers of calcium sulfate hemihydrate (bassanite, CaSO 4 ·0.5H 2 O) at 20 °C and 1 atm by mixing calcite and dilute sulfuric acid in methanol. The bassanite nanofibers are concluded to be synthesized by the formation of calcium sulfate on the calcite surface and its simultaneous reaction with the ...
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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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All types of gypsum binders are obtained mainly from the natural gypsum and man-made products. As a sustainable analogue of these materials, synthetic gypsum as a product of spent dilute sulphuric acid and calcium carbonate was proposed. We investigated the effect of various technological parameters on the production of calcium sulphate dihydrate particles …
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Synthesis of calcium sulfate hemihydrate whiskers using. 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 …
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In situ synthesis of hydrophobic calcium sulfate hemihydrate whiskers Nan Jiang, Chao Zhang, Caihong Xue et al.-Micro-environment regulation synthesis of ... Figure 2 Flow sheet. International Conference on Science and Technology 2019 Journal of …
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synthesis methods were used for the conv ersion of phos- phogypsum to ammonium sulfate and calcium carbonate: (i) Tw o-step method: it consists of reacting ammonia
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نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
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