— The transformation of phosphogypsum into fibrous alpha type hemihydrate gypsum α HH with high L/D ratio of length to diameter is one of the effective routes to achieve the high valued utilization In this work six types of cationic surfactants including CTAB STAC CHEC CGG CPAM and PDDA were selected to investigate their different
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— The present study investigated the effects of utilizing the treated flue gas desulfurization FGD gypsum on the improvement of properties of high volume fly ash FA cement pastes The FGD gypsum was subjected to heat treatment at 150 °C in a kiln to change its compositions and convert into β hemihydrate gypsum
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DOI / Corpus ID 266518658; Coordinated disposal of FGD gypsum and power plant concentrated brine via preparation of α hemihydrate gypsum article{Pang2023CoordinatedDO title={Coordinated disposal of FGD gypsum and power plant concentrated brine via preparation of $alpha$ hemihydrate gypsum}
— 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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— The hydration of calcium sulphate hemihydrate CaSO 4 · 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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— In Garg et al PG sample was calcined at 150 160 °C to generate b hemihydrate plaster/gypsum plaster The ground plaster was tested in accordance with 2542 1978 Methods of Test for gypsum plaster concrete and products Part 1 plaster and concrete for a variety of physical characteristics after passing through a 150 lm IS sieve
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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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— Direct production of high strength α calcium sulfate hemihydrate α HH with no additives was accomplished by the reaction of aluminum sulfate and waste CaCl 2 discarded from Solvay soda plant For scaling up this new process the crystallization kinetics of α HH was experimentally investigated under varying conditions including
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— The β hemihydrate is produced from the flue gas desulfurization FGD gypsum The β hemihydrate was characterized in the present study in order to evaluate its physical properties such as mineralogy element particle size distribution specific surface area and microstructure X ray diffraction XRD patterns were obtained using a Rigaku
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— With an abundance of coal fired power plants China offers a multitude of FGD gypsum sources [2] However the inconsistent quality and low whiteness of FGD gypsum limit its use [3] In the realm of construction materials the industry often employs FGD gypsum as a raw material for β hemihydrate gypsum β HH
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Industrial plasters and gypsum cements represent a broad range of formulations for a wide variety of industrial applications At Arcosa Specialty Materials we use high purity white gypsum rock to formulate everything from sanitary ware to architectural plasters from anchoring cement to casting plasters statuary and more We manufacture high quality
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— It also reviews the various applications of FGD gypsum such as in cement and concrete production agriculture and gypsum board manufacturing In the construction industry FGD gypsum is widely used as a raw material for producing gypsum products such as plasterboard and cement due to its high purity and low cost The heat of hydration
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Kelley Southard and Anderson1 have shown that the thermodynamic properties of calcium sulphate hemihydrate depend on whether the hemihydrate is produced from gypsum calcined in a steam saturated
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— The FGD gypsum produced from Xiaoshan Power Plant Zhejiang Province China was adopted as raw material The chemical composition is presented in Table 1 FGD gypsum is mainly composed of DH with a purity of % Some traces of heavy metals mg kg −1 Hg and mg kg −1 Cr are found in the FGD gypsum
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— Hemihydrate gypsum is found in two forms α hemihydrate gypsum α CaSO 4 ⋅ 2 O and β hemihydrate gypsum β CaSO 4 ⋅ 2 O [8] The α hemihydrate gypsum is produced by the autoclaving and salt solution method whereas β hemihydrate gypsum is obtained through calcination at temperature lower than 200 °C
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— Calcium sulfate is more or less hydrated depending on the temperature of the attack and appears either as dihydrate reaction 4 or as gypsum CaSO 4 2H 2 O or as hemihydrate reaction 5 or
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— This study combined inorganic α hemihydrate gypsum α HHG with organic polyacrylamide PAM hydrogel to create a novel α HHG/PAM composite material Through this facile composite strategy this fabricated material exhibited a significantly longer initial setting time and higher mechanical strength compared to α HHG The effects of the
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— Research highlights Water demand of β hemihydrate was determined using spread flow test and the influence of water content on the flowability was analyzed The deformation coefficient of the β hemihydrate was derived the thickness of a water layer around the particles to assure the fluidity of the hydrating system was discussed and the
— Preparation of α calcium sulfate hemihydrate α HH from flue gas desulfurization FGD gypsum is one of the most promising alternatives and of great value in effectively utilizing the FGD gypsum Based upon a salt solution method and the optimum operating conditions obtained in the laboratory scale experiments pilot scale tests have
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— The dehydration of gypsum to hemihydrate has been studied for decades because it is an important model reaction for understanding fluid triggered earthquakes and due to the global use of plaster
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