Calcium sulfate whisker (CSW)-reinforced paraffin (PA)/gypsum composites were prepared using PA as the phase change material, gypsum as the matrix, and CSW as the reinforcement. A universal testing machine, X-ray diffractometer, scanning electron microscope, and differential scanning calorimeter were used to determine the …
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Calcium sulfate whiskers (CSWs) are columnar crystalline synthetic microfibers with excellent heat resistance, high elastic modulus, and good processability [20], [21].CSWs not only offer the advantages of a fiber and inorganic filler, but also have the same chemical composition as that of the gypsum matrix, which results in good …
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Such technique realized the high-value utilization of industrial by-product gypsum, guided the HHG whisker preparation via the green and convenient method and reduced the environmental hazards ...
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1. Introduction. Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO 2 gas and lime slurry react under strong oxidation conditions. The main component of this gypsum is …
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CTAB as the crystal modifier can significantly promoted 1-D growth of α-HH whiskers along the c axis and the presence of 0.25% CTAB (by weight of FGD …
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Key words: crystal /; whisker /; control /; gypsum /; resource; Abstract: At present, the global reserves of gypsum resources are abundant, but the development …
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In order to obtain hydrophobic whisker for preparing polymeric composite product, the calcium sulfate whisker (CSW) prepared from flue gas desulfurization (FGD) gypsum by hydrothermal synthesis was modified by various surfactants, and the effects of some modification conditions on the hydrophobic property of CSW were …
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Semantic Scholar extracted view of "Facile preparation of α-calcium sulfate hemihydrate whisker from by-product gypsum in chloride-free salt solution system" by Wen Wang et al. Skip to ... ABSTRACT Accumulation of salts in soils is one of the major challenges for food production in vast areas, and reclamation of these soils is too expensive ...
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DOI: 10.1016/j.conbuildmat.2023.131918 Corpus ID: 259774979; A comprehensive review of flue gas desulphurized gypsum: Production, properties, and applications @article{Aakriti2023ACR, title={A comprehensive review of flue gas desulphurized gypsum: Production, properties, and applications}, author={Aakriti and …
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Lactic acid gypsum (LAG), the by-product from lactic acid preparation, has caused land occupation and environmental pollution. Herein, hemihydrate gypsum (HHG) whisker, an inorganic material with excellent performance, prepared using LAG as the raw material via atmospheric pressure salt solution method was investigated. Nitrate …
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Introduction. Titanium gypsum (TG) is a industrial gypsum produced during the manufacture of titanium dioxide (TiO 2) by the sulphuric acid process, after neutralisation of the acid waste solution with lime or calcium carbide slag (Zapata-Carbonell et al., 2019, Zhai et al., 2020).At present, every 1 ton of TiO 2 produced in China …
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Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6,10], has …
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1. Introduction. Gypsum, an important mineral resource, is widely used in the chemical industry [1], agriculture [2], medical treatment [3], building materials [4], food …
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The reason for this unsatisfying utilization rate is that the phosphogypsum should be dealt with quickly during the production of phosphate and compound fertilizer industry, during which the complex component needs to be purified first (preparation process) and then used for other purposes (production process) . Gypsum whisker …
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DOI: 10.1016/J.PROENV.2016.02.112 Corpus ID: 101722382; Preparation of Calcium Sulfate Whisker by Atmospheric Acidification Method from Flue Gas Desulfurization Gypsum @article{Sun2016PreparationOC, title={Preparation of Calcium Sulfate Whisker by Atmospheric Acidification Method from Flue Gas Desulfurization Gypsum}, …
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How to rationally utilize FGD gypsum has drawn much attention during recent years. Traditionally, the gypsum can be used as the raw material of a cement retarder 1, or processed to the building gypsum (β- CaSO 4 ·0.5H 2 O) 2 or high-strength gypsum (α- CaSO 4 ·0.5H 2 O) 3, 4. However, all of these products are low value-added.
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Download Citation | Calcium Sulfate Whisker Prepared by Flue Gas Desulfurization Gypsum: A Physical-Chemical Coupling Production Process | In this paper, the solid waste desulfurization gypsum ...
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Characterization of the raw FGD gypsum: (a) XRD, (b) TG analysis and DSC, (c and d) macroscopic and SEM image. 3.2 The effect of leaching parameters on the quality of CSW All the SEM images of the obtained CSW (Figure 2 and 3) show that the morphology of dihydrate gypsum have transformed from the initial angular morphology …
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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. However, the role of non-lattice cations during the transformation is still unclear. We report an evolution from "boosting–retarding" to …
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The byproduct gypsum can be utilized to produce hemihydrate calcium sulfate whisker, and the roasted heavy metal precipitation can be used as a primary chromium raw material (Cr2O3 content is ...
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Key words: crystal /; whisker /; control /; gypsum /; resource; Abstract: At present, the global reserves of gypsum resources are abundant, but the development utilization rate is still in a low level.Especially for the large production and inherent stockpiles of desulfurized gypsum and phosphogypsum, and most of the waste …
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A facile method to transform flue gas desulfurization gypsum (FGD gypsum) to α- calcium sulfate hemihydrate (α-HH) whiskers with high aspect ratios mediated by …
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Although the preparation of calcium sulfate whiskers using salt gypsum is a valuable concept, the use of untreated salt gypsum—which contains numerous impurity ions (such as Na +, Mg 2+, and K +)—has a considerable impact on the morphologies of the resulting calcium sulfate whiskers, leading to unstable whisker quality [5].
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DOI: 10.1016/j.conbuildmat.2024.134888 Corpus ID: 266829335; Preparation of α-hemihydrate gypsum whiskers from phosphogypsum using atmospheric pressure …
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Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6,10], has been an important alternative ...
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Although the preparation of calcium sulfate whiskers using salt gypsum is a valuable concept, the use of untreated salt gypsum—which contains numerous impurity ions (such as Na +, Mg 2+, and K +)—has a considerable impact on the morphologies of the resulting calcium sulfate whiskers, leading to unstable whisker quality [5]. It is therefore ...
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With increased whisker content, the expanded diameter decreased from 185 mm to 155 mm, which closely coincides with a previous . Conclusion. In conclusion, ACSW and CW were used to improve the performances of FGD gypsum. And the influence of whisker type and dosage on the mechanical properties of the composites were …
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In this thesis, proper amount of whiskers were added to building gypsum used as the basic materials. The gypsum board properties, such as densities and flexural strength etc., were influenced by various whisker content. The results showed that the flexural performance of gypsum board could be enhanced when adding calcium sulfate …
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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 utilize calcium sulfate in a high ...
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