DOI: 10.1016/j.conbuildmat.2023.133137 Corpus ID: 261502430; Study on the influence mechanism of flue gas desulphurisation gypsum on solid waste-based geopolymer grouting materials
WhatsApp: +86 18221755073
3.1 Effect of different temperatures on chlorides in FGD gypsum. The heat loss test results of the FGD gypsum inorganic chlorides are shown in Figure 3. For temperatures ranging from 30 to 90°C, none of the chlorides were decomposed in large amounts. ... According to the ACAA (American Coal Ash Association), 1 chloride content …
WhatsApp: +86 18221755073
Calcination of Gypsum was an accidental discovery as were its rehydration characteristics. Ancient man probably used lumps of Gypsum to enclose his fire. Some degree of calcination and softening occurred and when the fire was extinguished with water he noticed the lumps soon hardened. ... The boiling temperature of 250°-260°F …
WhatsApp: +86 18221755073
The calcination-treated FGD gypsum would not influence the type and morphology hydration products of the calcium sulfur aluminate cement-fly ash-FGD gypsum system, and the calcination of FGD gypsum is able to promote the hydration degree of fly ash especially in the presence of lime, making the hardened slurry more …
WhatsApp: +86 18221755073
DOI: 10.1016/j.conbuildmat.2021.124910 Corpus ID: 240532385; Preparation of high-performance building gypsum by calcining FGD gypsum adding CaO as crystal modifier @article{Hao2021PreparationOH, title={Preparation of high-performance building gypsum by calcining FGD gypsum adding CaO as crystal modifier}, author={ng Hao and …
WhatsApp: +86 18221755073
F lue gas desulfurization gypsum (FGDG) is a synthetic gypsum that is created during the removal of SO 2 from flue gas by reacting the SO 2 with calcite (CaCO 3) to form calcium sulfite (CaSO 3 …
WhatsApp: +86 18221755073
Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. ... FGDG is also used to produce CaS O 4 ∙ 0.5 H 2 O or CaS O 4 by calcination method [10], [11]. ... Strength properties of geopolymers derived from original and desulfurized red mud cured at ambient …
WhatsApp: +86 18221755073
The desulfurized gypsum from power plant flue gas is the largest resource of industrial by-product gypsum. By adopting advanced processes such as drying and calcination, it is applied in gypsum ...
WhatsApp: +86 18221755073
Research related to traditional multiphase gypsum has mainly focused on the mineralogical and textural characterization of historic mortars and plasters [6], [10], [11], [12], [13].There is, however, a lack of systematic studies which correlate the properties of the set plaster (i.e., mechanical strength and weathering resistance) with the …
WhatsApp: +86 18221755073
The approach taken in this work incorporated small- and full-scale testing to accomplish several goals: 1) develop an objective method for measuring the calcination depth of gypsum wallboard, 2) assess the utility of the calcination depth surveys in full-scale fires, and 3) characterize the impact of suppression water on calcination depth ...
WhatsApp: +86 18221755073
At 800 °C, the serrated and amorphous diffraction peaks significantly increased. Calcined RM positively influenced the setting and hardening of cement …
WhatsApp: +86 18221755073
Calcination: The process in which solids are heated to a very high temperature to remove any volatile substance present and also to oxidize a substance is called Calcination. Calcination of Gypsum: When the gypsum is heated in a controlled environment, it partially loses its water of crystalization and converts into plaster or stucco is called ...
WhatsApp: +86 18221755073
calcination temperature of β -hemihydrate gypsum is signicantly lower than that of cement, usually within a range of 135–180°C, and it can be fully recycled (Lushnikova and …
WhatsApp: +86 18221755073
DOI: 10.1016/j.conbuildmat.2019.116676 Corpus ID: 202974116; Calcination of calcium sulphoaluminate cement using flue gas desulfurization gypsum as whole calcium oxide source @article{Wu2019CalcinationOC, title={Calcination of calcium sulphoaluminate cement using flue gas desulfurization gypsum as whole …
WhatsApp: +86 18221755073
The properties of dihydrate gypsum will continue to disappear with the increase of calcination time. The desulfurized gypsum is calcined for 1.5h After that, it can be converted into semi-hydrated gypsum. ... If the calcining temperature of desulfurized gypsum is at 185℃, 235℃ and 300℃, the main component of the …
WhatsApp: +86 18221755073
The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance. ... In addition, the calcination temperature of β-hemihydrate gypsum is significantly lower than that of cement, usually within a range of 135–180 °C, ...
WhatsApp: +86 18221755073
Calcination of Gypsum . The chemical formula of gypsum is CaSO 4 ․2H 2 O. Gypsum is known as calcium sulfate dihydrate due to the presence of two molecules of water. When gypsum is subjected to calcination then it produces calcium sulfate hemihydrate, well known as plaster of Paris (P.O.P.). The formula of plaster of Paris is …
WhatsApp: +86 18221755073
The furnace temperature and the residence time are important for proper SO 2 sorption: Shemwell et al. (2000) Limestone injection into furnace and activation of unreacted calcium (LIFAC) ... (Oriza sativa L.) growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China. Geoderma, 187–188 (2012), …
WhatsApp: +86 18221755073
Thanks to the relatively high temperature level in the gypsum calcining mill, the gypsum is simultaneously calcined. The inlet temperature at the hot gas duct of this mill is usually …
WhatsApp: +86 18221755073
For example, it is reported that the ideal industrial temperature (solid) for the calcination of kaolinite clay is 700–850 °C, and often temperatures up to 900 °C are used in kiln calcination, with a residence time of ~ 30 min in the burning zone, to achieve near-complete calcination [70,71,72].
WhatsApp: +86 18221755073
[21] Tobert HA and Watt DB 2014 Impact of flue gas desulfurization gypsum application on water quality in a coastal plain soil J Environ Qual 43 273-280. Google Scholar [22] Tong ZJ, Li QS and Zhou YS 2009 Effects of desulfurized gypsum on heavy metal desorption and speciations in tidal flat reclaimed soil Eco and Environ Sci 18 2172 …
WhatsApp: +86 18221755073
desulfurization gypsum not easy to dehydrate, and affect the calcination temperature and quality of desulfurization gypsum. At the same time, high chloride ion content will reduce the bonding
WhatsApp: +86 18221755073
The calcined gypsum produced by the calcination of desulfurized gypsum can be widely used in gypsum based building materials, which has great economic and socia ... 2 content on the properties of calcined gypsum were investigated, and the optimal calcination temperature and appropriate content of KAl(SO4)2 were determined. …
WhatsApp: +86 18221755073
The paper assesses the influence of the calcination temperature of synthetic gypsum binder on the binding properties of innovative gypsum pastes, as well as on masonry and plastering mortars. The calcination process of gypsum binder was carried out at four different temperatures ranging from 170 to 190 °C. The specimens for …
WhatsApp: +86 18221755073
DOI: 10.1016/j.conbuildmat.2024.137061 Corpus ID: 270530557; Properties and microstructure of soil solidified by titanium slag-flue gas desulfurized gypsum-Portland cement composites as solidifiers
WhatsApp: +86 18221755073
Two kinds of inorganic reinforcing materials, single Portland cement clinker, compound Portland cement clinker and mineral powder, were used to analyze the effects of desulfurized gypsum on the properties of desulfurized gypsum based cementation material. The results show that either single Portland cement clinker or compound …
WhatsApp: +86 18221755073
In practice, both FGD gypsum and curing temperature have crucial effects on the phase composition, hydration process and mechanical properties of CSA cement pastes. The important conclusions can be summarized as follows: ... (α-HH) gypsum using flue gas desulfurized gypsum is essential for the utilization of calcium and sulfur …
WhatsApp: +86 18221755073
Erbs et al., studied the influence of different re-calcination temperatures (160 °C, 180 °C, and 200 °C) and for different time periods (1, 2, 4, 8, and 24 h) on the mechanical properties of recycled waste gypsum boards [157]. The highest compressive strength was observed for gypsum waste treated at 180 °C for 24 h.
WhatsApp: +86 18221755073
This article reviews the properties, production, and applications of flue gas desulfurized gypsum (FGD gypsum) in China, a by-product of coal combustion. It also …
WhatsApp: +86 18221755073
DOI: 10.1016/j.conbuildmat.2023.130361 Corpus ID: 255909899; Influence of calcination temperature on hydration behavior, strength, and weathering resistance of traditional gypsum plaster
WhatsApp: +86 18221755073