·The effects of phosphoric acid H3PO4 in pressurized aqueous solution on the dehydration of CaSO4·2H2O to form α hemihydrate gypsum α HH phase and the regulation of crystal shape were studied in this paper in order to provide guidance for the low cost and high value utilization of phosphogypsum The results showed that H3PO4
·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
·Synthesis of high length calcium sulfate whisker an ideal substitute of the plant based pulp fiber for papermaking Zeshan Tian Yuxin Liu Yi Mei Delong Xie Bing Sun Kai Li The existing α hemihydrate gypsum preparation process has low production efficiency and high energy consumption
·Among them the preparation of hemihydrate gypsum HH from PG by thermal treatment is a crucial and widespread method The prepared HH has two types α HH and β HH and the α HH has finer properties including higher mechanical strength and better workability and higher added value approximately 4 8 times price than the β HH
·The phase changes of gypsum were considered to be sufficiently understood for a long time However due to the increasing importance of gypsum recalcination connected with the planned closure of thermal power plants resulting in a lack of FGD gypsum and new detailed research associated with it gaps in the current
·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
GYPSUM BOARD AND GYPSUM POWDER [3566] Gypsum has been known for centuries and is one of the oldest building materials in the world When gypsum is heated it loses about three quarters of its water and becomes hemihydrate gypsum CaSO4•½H2O which is soft and can be easily ground to a powder called hemihydrate gypsum plaster or
·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 boiling or near boiling temperature for a period of time The crystal morphology of the produced α hemihydrate gypsum and thus its quality depend
·Semantic Scholar extracted view of "Flowability prediction of recycled α hemihydrate gypsum for 3D powder printing under combined effects of different glidants using response surface methodology" by Shuangxi Zhou et al
Download Citation On Dec 1 2023 Dongjie Pang and others published Coordinated disposal of FGD gypsum and power plant concentrated brine via preparation of α hemihydrate gypsum Find read
·Table 1 Chemical composition of FGD gypsum and the converted crystals Mass content/% CaO SO 3 SiO 2 Al 2 O 3 MgO K 2 O Fe 2 O 3 Na 2 O Water Loss FGD gypsum converted crystals Chin J Chem Eng Vol 19 No 2 April 2011 351
·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
·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 boiling or near boiling temperature for a period of time The crystal morphology of the produced α hemihydrate gypsum and thus its quality depend
·The investigated gypsum board in the present study was produced from the applied b hemihydrate by using a similar method as real gypsum board production [16 17] An accelerator a fine gypsum powder was used to adjust a final setting time of 5 7min in order to simulate a real gypsum plasterboard production process [17]
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The purpose of this work was to investigate the feasibility of using black tea powder produced through green technology plant source material and biotechnology as multifunctional admixture for the hemihydrate gypsum The hemihydrate gypsums were mixed with black tea and the setting times densities hydration characteristics and
·The approximate distribution of Al 2 O 3 Fe 2 O 3 and MgO between the ex filter acid and the hemihydrate gypsum is expected to be as follows Table 6 â Approximate distribution of Al 2 O 3 Fe 2 O 3 and MgO % in Filter Acid % in HH Gypsum Al 2 O 3 15 85 Fe 2 O 3 90 10 MgO 95 5 References [1] Wardle and K van Ede
·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
·Previous works showed that selection of suitable retarders and dosages can adjust the setting times of slurry to the desired level Retarders being commonly used such as organic acids [13] [14] [15] phosphates [16] polysaccharides [9] amino acids [10] and protein [14] have exhibited a significant retarding effect on the gypsum α
·The hydration of hemihydrate such as the hydration kinetics and setting has been studied intensively so far [4 11] but the emphasis was always laid on a hemihydrate Therefore topics such as the hydration induced properties and especially the behavior of the b hemihydrate upon hydration to produce gypsum plaster board is still
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The preparation of natural and synthetic gypsum prior to calcination such as drying and grinding The various calcination methods for β hemihydrate and α hemihydrate are reviewed such as batch kettle continuous kettle submerged combustion kettle conical kettle and other calcination equipment
·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
·Recognized as a top gypsum manufacturer in India India Gypsum is distinguished for its high quality products competitive prices and outstanding customer service Cement Limited Cement Limited a prominent gypsum manufacturer in India headquartered in Kanpur Uttar Pradesh was established in 1975
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