The semi-hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board, wallboard [107].The modified treatment of desulfurized gypsum with cement, inorganic waste, straw fiber and other wastes can be used to manufacture high-insulation and compression-resistant wall materials [108].Desulfurized …
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Current study proposes an effective way to modify the properties of super-sulfated cement (SSC) paste and mortar with preheated flue gas desulfurization (FDG) gypsum at different temperatures and durations, and different sulfate compositions. Preheated FGDs with temperatures between 25 and 150 °C and durations between 0 …
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Flue gas desulfurization gypsum-quaternary phase (FGD gypsum-Q phase) system is investigated to enhance the mechanical and water resistance performance of gypsum specimens. ... Gibbsite usually presents a weight loss in the broad range of 200–320 ℃ [30], [39]. Compared to gypsum crystals, hydrates have good water …
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We are a consortium of the leading natural gypsum producers in the Sultanate of Oman. The member companies have created a synergy between them to cater to the global market. Our Services. Contact us. …
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This research aims to study the utilization of waste from power plants, construction and demolition, and agriculture by varying the ratios of flue-gas desulfurization (FGD) gypsum, construction and …
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Based on salt effect and the solubility equilibrium theory of insoluble electrolyte, the technological process of ammonia-enhanced desulfurization gypsum carbonation for CO 2 sequestration in NH 4 Cl-H 2 O system was studied, and calcium carbonate with different crystal phase and morphology was prepared in this paper. The …
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The influence of desulfurization additives on the gypsum crystals formation was explored with the properties of moisture content, particle size distribution and crystal morphology.
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FGD (flue gas desulfurization) gypsum is an industrial by-product which is generated in power plants through wet flue gas desulfurization process. Its main phase is calcium sulfate dihydrate [7] ... The weight loss of the converted crystals at 0.6% SDS addition amount is about 6.0%, which approaches to the theoretical crystal water …
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Abstract: As a recycled material, flue gas desulfurization gypsum has been used to prepare calcium sulfate hemihydrate whisker (CSHW) through hydrothermal synthesis for several decades. However, the subsequent utilization of this resultant material has not yet received considerable attention. In the present research, CSHW was successfully …
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rate of gypsum crystal, change its crystal morphology, and lead to the formation of acicular gypsum crystal (Gao et al 2008, Sahibin et al 2018 ) . Further analysis from the mechanical point of ...
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Oman Gypsum quarry is located 19 km South of Thumrait city, Salalah. Thumrait is the nearest city. Quarry is located 4 Km (well graded road) away from the Muscat- Salalah dual carriage main highway. Nearest sea port for shipment is Salalah Port. This is well connected with high quality road network of Oman. Salalah Port is located 82.0 Km from …
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The multi-objective optimization results of mechanical properties and water resistance from RSM showed that the optimal ratio of sulfoaluminate cement, mineral …
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Pressure solution method and high temperature method are used to hydrothermal treatment desulfurization gypsum which is added crystal modifier preparing crystal α-hemihydrate decorative gypsum in ...
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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 …
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Keywords flue gas desulfurization gypsum, crystal growth, thermogravimetric analysis, phase transformation 1 INTRODUCTION Flue gas desulfurization (FGD) gypsum is gener- ated in huge amounts in energy and power industries around the world. It has been estimated that annual production of FGD …
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1.1. Flue gas desulfurization processes. The flue gas desulfurization (FGD) processes can be separated into two main categories: once-through and regenerable processes, depending on how the sorbent is treated after SO 2 adsorption (Srivastava and Jozewicz, 2001).Once-through, or non-regenerable, processes utilize the sorbent as a …
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Post-combustion flue gas desulfurization and denitrification technologies are essential in achieving the full compliance of fine particulate matter (PM 2.5, aerodynamic diameter less than 2.5 μm) air quality standards by 2030 in China as sulfur dioxide (SO 2) and nitrogen oxides (NO X) are the main precursors of PM …
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The desulfurization gypsum are widely utilized in cement retarder, ... was dried in the dry process to 150–200°C and loss the external water and 1.5 crystal water. The dried solids are injected into a circulating fluidized bed (CFB) heater 5 at the inlet of the cyclone. ... weight loss about 20% occurs at 200°C due to the dehydration of ...
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The extensive accumulation of phosphorus slag (PS) not only occupies land but also pollutes the environment. In the present study, calcium carbide slag (CS) and desulfurization gypsum (DG) were used to synergistically activate PS, and metakaolin (MK) was added to provide additional Al 2 O 3 for the cementitious system. The setting …
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Flue gas desulfurization (FGD) gypsum is an industrial by-product produced after industrial desulfurization treatment (Cui et al. 2018; Fu et al. 2017; Wang et al. 2013).The main component of FGD gypsum is CaSO 4 ·2H 2 O, similar to that of natural gypsum. They have the same performance, but the quality of FGD gypsum is higher …
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Fortunately, the strength of desulfurization gypsum can be increased by using additives such as cement [13], [14], fly ash [15], [16], [17], and mineral powder [18], [19], [20]. Inorganic materials have good pozzolanic effects and hydration and hardening properties, which can help fill pores and cause bond desulfurization of gypsum crystals.
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The influence of carboxyl number,carboxyl distance,and other auxiliary groups such as hydroxyl,double bond and its cis/trans-structure of organic acid on the crystal morphology of α-hemihydrate desulfurization gypsum were studied.The crystal modification mechanism of organic acids was analyzed from the point of adsorption and crystal …
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a This is gypsum from a wet desulfurization process that has been used since 1996. b,d These gypsums are the by-products of wet and semi-dry desulfurization processes, ... ∗The value was calculated based on a person with a body weight of 60 kg. Log in via your institution. Access through your institution Log in to Taylor & Francis Online.
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The production of flue gas desulfurization gypsum poses a serious threat to the environment. Thus, utilizing gypsum-based self-leveling mortar (GSLM) stands out as a promising and effective approach to address the issue. β-hemihydrate gypsum, cement, polycarboxylate superplasticizer, hydroxypropyl methyl cellulose ether (HPMC), …
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The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD) gypsum is a good way to realize the comprehensive utilization of FGD gypsum. To obtain α-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD …
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SEM results showed that CSH gels and AFt crystals were formed on the surface of gypsum crystal after hydration for 28 days, thus improving the compactness …
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According to statistics, the annual output of desulfurization gypsum in 2014 was about 75.5 million tons. China's 13th five-year plan puts forward that it is necessary to speed up the recycling of waste resources (Hao et al 2016, Ding et al 2021, Ding et al 2023a, 2023b). Thereforethe desulfurization gypsum has excellent …
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UV lights were set inside separate chambers which were put in a well ventilated room. Four UV lamps with the frequency of 14 W, 24 W, 36 W, 55 W were used in our study. 13.0 g gypsum sample was put in a glass petri dish, then put the dish under the UV lamp.To avoid the enhance of temperature caused by UV irradiation, the …
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Flue gas desulfurization gypsum ... 0.5% by weight of LBM. The FGDG is incorporated into the paste at dosage levels of 0%, 50%, 75%, , 125% and 150% by weight of MgSO 4 ·7H 2 O. The water/binder ratio is dependent on the workability and chosen to be 0.40, which takes the content of external free water and crystal water from …
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A facile route is developed to convert flue gas desulfurization gypsum waste. • Morphologies and crystal phases of the gypsum products can be controlled. • …
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Flue gas desulfurization gypsum (FGDG) and fly ash (FA) are by-products from coal-fired power plants that urgently need to be recycled in a sustainable way.
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Salalah International Gypsum Co. L.L.C., or SIG in short, is the leading natural gypsum producer & exporter from Sultanate of Oman. We are located at Salalah in the Dhofar …
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