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DOI: 10.1016/j.conbuildmat.2023.130453 Corpus ID: 256217243; Utilization of phosphogypsum to synthesize α-hemihydrate gypsum in H3PO4–H2O solution @article{Chen2023UtilizationOP, title={Utilization of phosphogypsum to synthesize $alpha$-hemihydrate gypsum in H3PO4–H2O solution}, author={Long Chen and Lin …
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What is gypsum? What is hemihydrate gypsum? Define gypsum plaster and gypsum plasterboard. Where do gypsum deposits are located? List the different types of …
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Calcium sulfate hemihydrate whiskers (CSHWs) were prepared from high-purity salt gypsum in a glycerol–water system. The effects of the glycerol/water ratio, reaction temperature, reaction time, and stirring speed on the crystal morphology of the CSHWs were investigated.
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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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For three experiments, gypsum fully converted to hemihydrate (Fig. 2c–h). Only the low-stress experiment at T = 129 °C retained ~1% of gypsum in the sample …
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1 Introduction . Calcium sulfate hemihydrate [CaCO 4 ∙ 0.5H 2 O(s)] can be found naturally in very dry climate regions in Egypt, Australia, Death valley and Kuwait as bassanite, but in the presence of water or humid atmosphere it can convert to dehydrate [1, 2]. Therefore, the production of hemihydrate industrially has been studied widely through the dehydration …
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An industrially feasible process was proposed to produce α-calcium sulfate hemihydrate (α-HH) from FGD gypsum without any additives. In this process, an AlCl 3 solution was used to promote the …
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Grinding and calcining of gypsum with Pfeiffer grinding plants. 1 Two different modifi-cations of the hemihy-drate CaSO x 1⁄2. 4 H2O are produced. When gypsum is …
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Download scientific diagram | Structures of a) gypsum, b) hemihydrate, and c) insoluble anhydrite with view in c-direction from publication: Crystallization and Phase Stability of CaSO4 and CaSO4 ...
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hemihydrate gypsum, and the influence degree of different forms of soluble phosphorus is unclear. Therefore, the utilization of a-hemihydrate gypsum is greatly limited. In this study, the effect of soluble phosphorus on the setting time and mechanical properties of a-hemihydrate gypsum was investi-gated by adding different amounts of H 3PO 4 ...
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DOI: 10.1016/J.PCRYSGROW.2007.01.002 Corpus ID: 96747728; Calcium sulphate hemihydrate hydration leading to gypsum crystallization @article{Singh2007CalciumSH, title={Calcium sulphate hemihydrate hydration leading to gypsum crystallization}, author={Nakshatra Bahadur Singh and Bernhard Middendorf}, journal={Progress in …
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DOI: 10.1016/j.jcrysgro.2021.126360 Corpus ID: 241731164; Preparation of hemihydrate gypsum with controllable morphology in Glycerol-NaCl-Water solutions with maleic acid @article{Chen2021PreparationOH, title={Preparation of hemihydrate gypsum with controllable morphology in Glycerol-NaCl-Water solutions with maleic acid}, …
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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 water molecules to the crystal lattice of CaSO4 and then separating them from a surfactant-stabilized water-in-oil emulsion (mean droplet size of …
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Gypsum (calcium sulfate dihydrate) is one of the most used inorganic binding materials in the world. During calcination, calcium sulfate subhydrates are formed and, for technical reasons, are mixed with water to form dihydrate again. Therefore, the dehydration process of gypsum and the rehydration of hemihydrate were investigated. This …
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Flue-gas desulphurization (FGD) gypsum is a highly prevalent industrial by-product worldwide, which can be an excellent alternative to natural gypsum due to its high content of CaSO4·2H2O. The preparation of α-calcium sulfate hemihydrate is a high-value pathway for the efficient use of FGD gypsum. Here, a dynamic method, or an improved …
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In this study, the effect of sulphonated naphthalene formaldehyde condensate (SNF) and polycarboxylate (PC) superplasticizers on the performance of β-calcium sulphate hemihydrate plaster has been discussed. A considerable improvement in the properties of β-hemihydrate plaster was observed with an increase in …
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The hydration of calcium sulphate hemihydrate (CaSO 4 ·0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 ·2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the …
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The Prayon HDH Process is a clever technology that maximizes the P₂O₅ strength in the acid and produces a high-quality gypsum. It consists of an attack of the phosphate rock under hemihydrate conditions. …
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Learn about the properties, forms, and uses of calcium sulfate hemihydrate, also known as plaster of Paris, a material derived from gypsum. Find chapters and articles on its …
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Beta hemihydrate gypsum is suitable for construction applications where early high-strength development is necessary. Because alpha hemihydrate makes a denser, higher …
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Alpha high‐strength hemihydrate gypsum (CaSO 4 ·0.5H 2 O, α‐HH) with a large‐size columnar crystal (average size: 135.31 µm, maximum size: 500 µm) is successfully prepared via a NaCl ...
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Keywords: α-calcium sulfate hemihydrate, industrial by-product gypsum, FGD gypsum, phosphogypsum, preparation method 1. Introduction 1.1. α-calcium sulfate hemihydrate Calcium sulfate hemihydrate generally exists in two forms, i.e., α- and β-forms. As an important building material, the industrial production and application of β-form began ...
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to produce hemihydrate gypsum (HH) cementing materials, mainly -type hemihydrate gypsum ( -HH) and -type hemihydrate gypsum ( -HH). -HH can be used to produce various gypsum-based building materials such as gypsum blocks and gypsum boards. However, because -HH crystals are generally irregular fibers or flakes, the structure is
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The mass loss in the temperature range of 81.6 ℃∼137.1 ℃ is caused by the dehydration of gypsum into hemihydrate gypsum, which is in accordance with ref [40]. As the temperature continues to increase to 297.5 °C, the mass loss reaches 5.80 %. This is the result of the removal of crystal water from hemihydrate gypsum and omongwaite.
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Hemihydrate is a form of gypsum that is used as a binder in construction materials. Learn about the production methods, properties and applications of hemihydrate and its …
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DOI: 10.1016/j.conbuildmat.2024.136656 Corpus ID: 269855858; Preparation of α-calcium sulfate hemihydrate with high mechanical strength from natural fibrous gypsum in KCl-mediated glycerol-water solution
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Alcohol–water solution-mediated transformation of gypsum into α-hemihydrate (α-HH) whiskers provides a green alternative for the high-value-added recycling of flue gas desulfurization (FGD) gypsum. … Expand. 5. PDF. Save. Effect of Soluble P2O5 Form on the Hydration and Hardening of Hemihydrate Phosphogypsum.
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In this study, phosphogypsum (PG) is simulated by doping fluorine and phosphorus ions in an analytically pure reagent of gypsum dihydrate. The influence of fluorine and phosphorus impurity and content on the dehydration reaction process of phosphogypsum and its crystalline micromorphology is assessed during the preparation …
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thermal analysis in a sample of hemihydrate prepared by calcining gypsum under conditions simulating the manufacture of gypsum plaster in a kettle. By means of differential thermal analysis it is ...
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The calcium sulphate dihydrate gypsum (CaSO 4 ·2H 2 O) is the most common sulphate evaporite mineral on our planet 1.Sulphate evaporites play an important role in Earth's sulphur cycle and are ...
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