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The crystal morphology of the produced α hemihydrate gypsum and thus its quality depend significantly on the composition of the liquid phase Additions of different carbonic acids may improve the quality of the product distinctly Under optimal working conditions the quality of the formed α hemihydrate gypsum is similar to that of a
·Phosphogypsum PG is a massive industrial solid waste In this paper PG was purified by flotation method and α hemihydrate gypsum α HH was prepared by the autoclaving method
1 ·The resulting chemical compound calcium sulfate hemihydrate CaSO 4 •½H 2 O will in turn react with water to reform gypsum This property is the basis for gypsum s use in making wallboard panels molds for ceramics such as dishes sinks and toilets dental and orthopedic plasters and for many other uses Quarry haulage trucks or
·The preparation of α hemihydrate gypsum α HH from phosphogypsum mainly composed of dihydrate gypsum DH is an effective way for high value utilization of phosphogypsum solid waste which can alleviate the problem of massive accumulation of phosphogypsum solid waste [1] The whiskers of α HH prove to be reinforcing agents in
·When gypsum is heated at about 150 160 °C it loses approximately three quarters of its water in a partial dehydration process and becomes hemihydrate gypsum CaSO 4 •½H 2 O or calcined gypsum; it is also known as beta gypsum alpha gypsum is made by processing batches of gypsum under elevated pressure Calcined gypsum or beta gypsum is
·Phosphogypsum PG as a waste by product with high content and complicated impurities is difficult to be utilised effectively Herein cleaner PG is prepared with HCl H 2 SO 4 method and thus is used to synthesise α hemihydrate gypsum α HH in CaCl 2 solution under atmospheric pressure Morphology and mechanical strength are controlled by introducing
·Structural characteristic and formation mechanism of hemihydrate calcium sulfate whiskers prepared using FGD gypsum Author links open overlay panel Xiaoting Zhang Lingwei Ran Xiao Wang Anion water in gypsum CaSO 4 ·2H 2 O and hemihydrate CaSO 4 ·1/2H 2 O Cement and Concrete Research 32 2 2002 pp 313 316
·The stockpiling of phosphogypsum PG poses a substantial risk of environmental reduce the stockpile of PG and enhance its value this research utilized phosphogypsum to produce α hemihydrate gypsum a HH The study elucidates the crystallization process of α HH which involves Ca 2 helical growth and coordinated filling by
· article{Li2018InsightIT title={Insight into the effect of maleic acid on the preparation of $alpha$ hemihydrate gypsum from phosphogypsum in Na2SO4 solution} author={Xian bo Li and Qin Zhang and Baolin Ke and Xianchen Wang and Long Jiang Li and Xianhai Li and Song Mao} journal={Journal of Crystal Growth} year={2018} url={https //api
·The CaSO 4 ·H 2 O system is composed of five solid phases dihydrate hemihydrate CaSO 4 · 2 O anhydrite I CaSO 4 anhydrite П CaSO 4 and anhydrite Ш CaSO 4 [3] Among them hemihydrate is usually used to produce gypsum plasterboard Hemihydrate occurs in two forms the α and β type whereas β hemihydrate is mainly
·The controlled synthesis of α hemihydrate α HH gypsum using flue gas desulfurized gypsum is essential for the utilization of calcium and sulfur resources An aspect ratio AR close to 1 is essential to improve the quality and performance of α HH gypsum To solve this problem the morphological modification of α HH gypsum by modifiers
·The industrial application of PG is mainly focused on building gypsum β CaSO 4 · 2 O [5] α hemihydrate gypsum α CaSO 4 · 2 O α HH [6] [7] cement retarder [8] sulfuric acid co production cement [9] soil conditioner [10] and so on Among which the preparation of α HH using PG is one of the most profitable approaches because α HH is a
·These are expected to be α hemihydrate This theory of the formation of α hemihydrate inside of a gypsum crystal is experimentally proven in the present work This work firstly shows that the
DOI / 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 Crystal Growth and Characterization of
DOI / Corpus ID 272319705; Sodium doping and control during the preparation of α hemihydrate gypsum in NaCl solution article{Li2024SodiumDA title={Sodium doping and control during the preparation of $alpha$ hemihydrate gypsum in NaCl solution} author={Xianbo Li and Lusong Wang} journal={Journal of Industrial and Engineering
Keywords α calcium sulfate hemihydrate industrial by product gypsum FGD gypsum phosphogypsum preparation method 1 Introduction α calcium sulfate hemihydrate Calcium sulfate hemihydrate generally exists in two forms α and β forms As an important building material the industrial production and application of β form began
·QXRD results show the transformation of gypsum into hemihydrate after a residence time of 8 h and 4 h SEM images distinguish the α‐HH and β‐HH modifications For fgd‐gypsum pellets the
·Preparation of α hemihydrate gypsum crystal is an approach for utilization of phosphogypsum PG but the soluble phosphorus impurities in PG have a crucial influence on the performance of α hemihydrate gypsum In this article different forms of soluble phosphorus H3PO4 H2PO4− and HPO42− on the setting time and mechanical properties of α
·α Hemihydrate gypsum α HH is known as high strength gypsum the strength of α HHs is three times larger than that of building gypsum in addition α HH has good working performance environmental performance and biological performance [7] So α HH has been widely used in precision casting high end building materials arts and crafts medical and
·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 autoclaved
·Due to its excellent cementitious properties and higher strength α calcium sulfate hemihydrate HH CaSO 4 · 2 O traditionally known as plaster of Paris is widely used in modern construction and ceramics industries [3] [4] Currently it is commercially produced by dehydration of natural gypsum or from flue gas desulfurization FGD gypsum mainly
·preparation of α hemihydrate gypsum α HH is an important way to achieve high value utilization of FGD gypsum Although the glycerol water solution approach can be used to produce α HH from FGD gypsum under mild conditions the transition is kinetically unfavorable in the mixed solution Here an easy pretreatment was used to activate FGD
·The objective of this study is to investigate the impact of F − on the performance of PCE in the hemihydrate gypsum system For this purpose F − was introduced into natural hemihydrate gypsum PCE system The effects of F − on fluidity water/hemihydrate ratio for standard consistency and setting time of hemihydrate gypsum PCE systems were studied
·Dihydrate and β hemihydrate gypsum exhibit relatively higher solubility and dissolve more quickly than CaSO 4 However there is little information on their incorporation in CAC Although Zhang et al [19] analysed the influence of the type and dosage of calcium sulphate on the properties of CAC based materials they did not study phase
·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 CaSO 4 ·2H 2 O The preparation of α calcium sulfate hemihydrate is a high value pathway for the efficient use of FGD gypsum
the time limiting step in these processes is the step of forming the alpha hemihydrate gypsum Even in processes where the dihydrate gypsum slurry is continuously fed into a vessel and alpha hemihydrate gypsum continuously removed from the vessel the slurry must remain in the vessel for a residence time on the order of hours as described above for the full conversion to alpha
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
