gypsum decomposition temperature in Oman

Microwave-assisted decomposition of fgd gypsum in the presence of

Due to microwave heating and calcium ferrite formation, the decomposition temperature of FGD gypsum decreased to around 800°C in air atmosphere. Based on the XRD patterns and SEM images, the reaction of CaSO 4 with the additives occurred from the centre to the surface where the liquid phase was generated under microwave heating.

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Effect of Gypsum Waste Inclusion on Gasification of …

Here, only MSW-gypsum decomposition is shown since MSW decomposition showed no mass-loss in this temperature zone for all the different O 2 concentrations examined here. This reveals that a significant interaction between MSW and gypsum occurs in the high temperature zone during pyrolysis, but these peaks are …

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Reductive Decomposition of Gypsum by Carbon Monoxide

High-Temperature Release of SO2 from Calcined Cement Raw Materials. Energy & Fuels 2011, 25 (7) ... Insight into the reaction characteristics of H2-reduction decomposition of gypsum: Experimental and isothermal kinetic analysis. International Journal of Hydrogen Energy 2024, 49, 1344-1360.

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Retarding effect of gypsum for hybrid alkali-activated …

Retarding effect of gypsum for hybrid alkali-activated cements (HAACs) at ambient temperature ... The peak around 400 °C is attributed to the decomposition of portlandite [33]. The third peak, ... The use of thermal analysis in assessing the effect of temperature on a cement paste. Cem. Concr. Res., 35 (2005), pp. 609-613.

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Lightweight waste-based gypsum composites for building temperature …

The second endothermic peak at 130 °C corresponding to the thermal decomposition of gypsum into hemihydrate, ... Three specimens to be tested for each mix code were placed inside a climatic chamber with a temperature accuracy of ± 0.5 °C and relative humidity accuracy of ± 5% and subjected to different RH levels: 10%, 30%, 50%, …

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Experimental Studies on Decomposing Properties of …

Due to microwave heating and calcium ferrite formation, the decomposition temperature of FGD gypsum decreased to around 800°C in air atmosphere. Based on the XRD patterns and SEM images, the ...

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Reductive decomposition of waste gypsum with SiO

From the point of view of a sustainable and environment-friendly society based on the recycling of material resources, it is preferable to utilize waste gypsum as a substitute for lime, which is currently produced by the calcination of limestone. In the present work, the reductive decomposition of CaSO4 was investigated under an …

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Thermal decomposition of limestone and gypsum by solar …

This would tend to increase the decomposition temperature[7]. Such problems can be avoided by using a fluidized bed reactor, where temperature homogenit.v and high mass and heat transfer rates can be obtained. 3.2 Gypsum decomposition Gypsum (CaSO~. 2H20) becomes anhydrous at temperatures above 160: CaSOa" …

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Effect of high temperatures on gypsum-based composites

The thermal properties of gypsum boards at elevated temperatures were described e.g. by Thomas [8] and by Park et al. [11] and thermal models were proposed by Thomas [6], Lázaro et al. [12] Weber [13] and Mehaffey et al. [14]. Gypsum exposed to high temperature exhibits significant shrinkage, which could be reduced by a suitable filler.

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Thermal Analysis of Gypsum

transition from hemihydrate gypsum to crystalline gypsum (dihydrate gypsum). This brief presents examples of TG/DTA and DSC measurements of the thermal changes of gypsum.

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Experimental Studies on Decomposing Properties of …

Results from the TGA showed that the initial decomposing temperatures of gypsum in all reducing atmospheres are about 800 C; however, the ratio between CaS …

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Fate of mercury in flue gas desulfurization gypsum …

Zhu et al. [20] used temperature programmed decomposition and sequential chemical extraction method to explore the fate of mercury in FGD gypsum, which concluded that mercury was mainly retained ...

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Mechanical and Thermo-Physical Performances of Gypsum …

In contrast, the decomposition of DP occurred at temperatures ranging from 160 °C to 230 °C. The DP composite was more sensitive to temperature change during …

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Changes in structure and composition of gypsum paste at …

An overall powdery/blurry effect on the crystal surfaces can be observed. The changes in structure and composition of the gypsum matrix at high temperatures detected in this work were in agreement ...

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Dehydration Pathways of Gypsum and the Rehydration …

In the low-temperature and high water vapor zone above curve AB in Figure 2, gypsum is thermodynamically stable; in the ABC zone, CaSO 4 ·2H 2 O will partially dehydrate its crystal water to form β-CaSO 4 ·0.5H 2 O, and as the temperature is increased, gypsum undergoes a two-step dehydration process (CaSO 4 ·2H 2 O → γ …

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Oman retains crown as world's biggest gypsum exporter …

Gypsum shipments from the Sultanate of Oman, currently the world's biggest exporter of the industrial mineral, are projected to grow exponentially over the next decade as consumption rebounds in key markets, while traditional exporters curtail outflows of the commodity to meet domestic demand.

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Effect of high temperatures on gypsum-based composites

The second weight loss of gypsum, in the interval 660–780 °C, is caused by the decomposition of muscovite, which was found in the gypsum by XRD analysis …

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Microwave-assisted decomposition of FGD gypsum in the …

Due to microwave heating and calcium ferrite formation, the decomposition temperature of FGD gypsum decreased to around 800°C in air atmosphere. Based on the XRD patterns and SEM images, the reaction of CaSO4 with the additives occurred from the centre to the surface where the liquid phase was generated under microwave heating.

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Gypsum plaster waste recycling: A potential environmental …

Gypsum plaster is considered a sustainable binder, produced by the calcination of gypsum (calcium sulfate dihydrate: CaSO4∙2H2O) in a dry process at temperatures that range from 125 °C to 180 °C (Borrachero et al., 2008; Gartner, 2009).

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Thermal analysis application: Gypsum

The chemical formula of Gypsum is CaSO4 ∙ 2H2O (Calcium Sulfate Dihydrate). There are a large number of uses for gypsum as a building material. ... The sulfate decomposition can be seen in a further mass …

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New insight into the phase changes of gypsum

The dehydration temperature depends on the measurement method, the gypsum origin (natural, FGD), the type of required calcium sulfate hemihydrate (α, β), and the conditions during the experiment (pH, humidity, etc.), and this temperature …

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Thermal decomposition of gypsum

The decomposition of CaSO 4 · 2H 2 O under the conditions of TA consists of two consecutive reactions, firstly CaSO 4 · 0.5H 2 O then CaSO 4 III being formed. …

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Study on Kinetic Parameters and Reductive Decomposition …

The results indicated that the factors of the final reaction temperature and the reaction atmosphere have significant influences on the decomposition of gypsum, in the condition of 850–1,050°C, the total decomposition rate of three gypsums increases and the time-consumption of reaching decomposition equilibrium of three gypsums …

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Gypsum content determination in Portland cements by thermogravimetry

Due to the above chemical properties, the decomposition of gypsum occurs at higher temperature ranges than plaster of Paris or hemihydrate samples. For the former, at high heating rates, decomposition occurs from 100 to about 300 °C, with overlapped peaks of the two steps .

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Temperature dependence of gypsum dissolution rates

Therefore, this study uses powders in a stirred suspension at specified temperatures to determine the temperature dependence of gypsum dissolution rates. The dissolution of gypsum, (1) CaSO 4 ⋅ 2 H 2 O → Ca 2 + + SO 4 2 − + 2 H 2 O, has a standard Gibbs energy change of Δ G ° = 26.1 kJ mol −1, yielding a solubility product of …

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Elemental sulfur recovery from FGD gypsum and calcium …

Flue gas desulfurization (FGD) gypsum mainly contains gypsum, which comes from the FGD by using lime or limestone. The effects of calcining temperature and time on calcium sulfide preparation were explored. The gypsum completely decomposed into calcium sulfide by calcining at 900 °C for 30 min. The effect of time on CaS and …

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Thermal decomposition of gypsum

Semantic Scholar extracted view of "Thermal decomposition of gypsum" by F. Paulik et al. ... with limited oxygen and argon studies at the same temperature. … Expand. 9. Save. Investigations under quasi-isothermal and quasi-isobaric conditions by means of the Derivatograph.

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Reaction mechanism of reductive decomposition of FGD gypsum …

Comparing the TG curves in Fig. 3, it seems that there was a considerable change in the starting temperature of the decomposition reaction of the FGD gypsum with addition of anthracite that took place at 670 °C. Therefore, addition of carbon caused the decomposition reaction to proceed at lower temperature.

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Fire behaviour of gypsum plasterboard wall assemblies: CFD …

This process, known as "gypsum dehydration" (or "calcination"), occurs in the temperature region between 80 °C and 250 °C [6]; the good fire resistance characteristics of GP are mainly owed to this effect. Gypsum chemical decomposition (dissociation of the chemically bound water) occurs in two stages [7]. In the first stage (Eq.

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Gypsum plaster waste recycling: A potential environmental …

The gypsum plaster decomposition of CaSO 4 ·2H 2 O and CaSO 4 ·0.5H 2 O occurs in two steps with very near temperatures (Borrachero et al., 2008, Dweck et al., 2016). The dissociative mechanisms of the dehydration reaction have low differences, which difficult the precise determination of the end point of CaSO 4 ·2H 2 O conversion …

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