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Curing under steam atmosphere is a key process for the production of α hemihydrate from raw gypsum stone The α hemihydrate is used to produce moulding plasters gypsum building materials and special plasters with outstanding here are the high compressive and tensile strength which can still be influenced by optimised process control in
·Calcium sulfate is the subject of much research due to its wide scope and large scale of industrial applications [1] [2] [3] It occurs in nature mainly in form of three different phases distinguished by the content of crystal water dihydrate DH CaSO 4 ·2H 2 O hemihydrate HH CaSO 4 · 2 O and anhydrite AH CaSO 4 Well control of the phase
·The hydrothermal method is efficient in synthesizing alpha calcium sulfate hemihydrate α CSH particles from flue gas desulfurization gypsum This study investigates the effects of LiCl·H 2 O solution with different carboxylates on the conversion process Under optimal operating conditions hexahedral column shaped crystals are obtained to
·This study explored the production of a medium low strength α hemihydrate gypsum α HH from phosphogypsum using an autoclaved method The influence of slurry concentration spreading thickness crystallizing agents slurry pH autoclaving temperature and autoclaving time on the properties of α HH was investigated The energy consumption of
·The process of converting gypsum into alpha hemihydrate involves heating gypsum at a specific temperature to remove water molecules resulting in a more concentrated and stable form of calcium sulfate The term alpha in alpha hemihydrate refers to the unique crystal structure formed during this dehydration process The alpha form exhibits
Due to its high mechanical strength our alpha hemihydrate is used in a wide variety of industrial formulations The high pressure used to produce alpha plaster converts it into compact gypsum crystals which in turn ensures exceptional strength This makes our alpha hemihydrates whether made from FGD or natural gypsum the perfect solution
·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
This study was performed to investigate the formation process of calcium sulfate α hemihydrate from FGD gypsum produced at thermal power plant burning bituminous coal The experimental results showed that calcium sulfate α hemihydrate with a large aspect ratio was produced in the temperature range of 120 °C and 140 °C in the absence of additives through dissolution
·Phosphogypsum PG is a by product of the wet process phosphoric acid process which causes serious environmental issues In this work PG was taken as raw Modeling of the kinetics of the synthesis process for calcium sulfate alpha hemihydrate from gypsum formed by flue gas desulfurization FGD is important to produce high performance
·In this work α hemihydrate gypsum α HH microrods were synthesized in large scale using flue gas desulfurization FGD gypsum as the raw materials in alcohol salt system under normal preparation conditions were investigated and optimized as follows the concentration of Ca 2 was mol·L −1 the concentration of Mg 2 was mol·L −1
·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
·that autoclave free processes to produce high strength building gypsum alpha HH from FGD gypsum have not yet achieved industrialized manufacture at a large scale
·The hydrothermal method is efficient in synthesizing alpha calcium sulfate hemihydrate α CSH particles from flue gas desulfurization gypsum This study investigates the effects of LiCl·H 2 O solution with different carboxylates on the conversion process Under optimal operating conditions hexahedral column shaped crystals are obtained to
·A process for producing alpha hemihydrate gypsum from dihydrate gypsum comprising mixing the dihydrate gypsum with water to form a slurry; pumping the slurry into a heating tube at a flowrate effective for the slurry to have an average residence time in the heating tube of less than or equal to about 10 minutes; heating the heating tube at a
·Flue gas gypsum may be converted to α hemihydrate by suspending the starting material in inorganic salt solutions of high concentration or in diluted sulfuric acid and maintaining the suspension at…
·High strength gypsum is the recognized designation for α hemihydrate gypsum often referred to as α HH CaSO 4 · 2 O which is a cementitious material with low water requirement and high strength [8] The strength of α HH is generally between 25 and 50 N/mm 2 which is three times that of ordinary building plaster and has superior working
·This paper introduced the characteristics of α high strength gypsum preparation from FGD gypsum by autoclaved semi dry process The compositions of the product in different stages of the reaction and the effects of crystal modifiers on the morphology of the α HH crystals were examined and compared The properties of α HH and the feature of hydration products
The process makes calcium sulfate alpha hemihydrate from finely divided calcium sulfate dihydrate by transforming the calcium sulfate dihydrate in the presence of saturated steam A molded body is formed from the calcium sulfate dihydrate which has a plurality of pores having a pore volume amounting to 15 to 60% by volume of the total volume of the entire molded body
·The chemical composition of alpha hemihydrate α HH from the steam autoclave process and beta hemihydrate β HH were determined by XRD as shown in Table 1 In more detail hemihydrate was added to water to perform the hydration reaction to obtain dihydrate and then the formed dihydrate was crushed and calcinated back to beta hemihydrate
·Alpha calcium sulfate hemihydrate α HH has been used effectively in grafting through its desired features to support bone regeneration In recent years many synthetic methods have been proposed
·Lanzon [13] studied the hydration process of gypsum building plasters with different concentrations of citric acid by attenuated total reflectance infrared spectroscopy which can provide an estimation of the time when gypsum formed It was found that citric acid inhibits the hydration of hemihydrate to dihydrate and the inhibition effect is
·For the first time α calcium sulfate hemihydrate α HH was successfully prepared from calcium sulfate dihydrate DH in methanol water solution under atmospheric pressure The effect of methanol concentrations 40 73 mol% on the transition from DH to α HH were investigated at temperatures 60° 75°C within a reaction time of 36 h The results
·pH is one of the most important parameters that determine the crystallization process but it is always neglected in the preparation of {alpha} calcium sulfate hemihydrate {alpha} HH from calcium sulfate dihydrate DH with the hydrothermal method Flue gas desulfurization FGD gypsum which is mainly composed of DH was used as raw material to
An improved "lump" process for producing alpha gypsum calcium sulfate hemihydrate from natural gypsum rock of the type wherein lumps of gypsum rock particles a minimum of about 1/2 inch or cm in size are calcined to low water demand alpha hemihydrate by autoclaving in a saturated steam atmosphere quickly dried and pulverized is disclosed
To enable further work to be carried out on the hydration of hemihydrate plasters materials purer than the available commercial plasters and with reproducible properties were required As a first stage in the attempted preparation of such materials the process variables in the autoclave dehydration of gypsum were investigated
