This would allow FGDG present in landfills and temporary storage locations to be perceived as a valuable source for gypsum for these newly identified applications. ... it must fulfill these basic requirements: 1) ... growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China. Geoderma, 187–188 (2012), pp. 24-30 ...
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The undisturbed desulfurization gypsum after screening was calcined at 180 °C for 2 h and sealed at room temperature for about 7 d to form semi-hydrated desulfurized gypsum. Fig. 1 shows the microscopic morphology and X-ray diffraction (XRD) diagram of desulfurization gypsum. The quicklime was taken from Yibin …
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Ltd.); Desulfurization gypsum (Huainan Thermal Power Plant). The content of -hemihydrate gypsum and dihydrate gypsum are 71.4% and 14.7%, respectively. Meanwhile, the chemical composition and phase XRD spectrum of the desulfurized gypsum are shown in Table 1 and Fig. 1, respectively; the TG-DSC analysis curve is shown in Fig. 2;
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[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 …
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Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. ... Currently, for FGDG to be incorporated in wallboards, it must fulfill these basic requirements: 1) ... (Oriza sativa L.) growth and yield using desulfurized gypsum in …
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Storage of low-grade diatomite can lead to environmental pollution. This study prepares a low-grade diatomite-based cementitious material (LGDCM) and assesses the influence of CaO/SiO 2 molar ratio on LGDCM strength within a low-grade diatomite–lime–desulfurized gypsum system. The carbon emissions from LGDCM …
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The desulfurized gypsum application rates varied between 0 and 50 t·hm-2 across six treatment levels, based on the soil Na + and Mg 2+ exchange capacity. ... Additionally, soil organic carbon storage peaked at an application rate of 40 t·hm-2, exhibiting a 0. 029 kg·m-2 increase over the control.
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To investigate the macroscopic mechanical properties and failure evolution mechanism of desulfurization gypsum–fly ash fluid lightweight soil, a microscale numerical model using PFC2D (Particle Flow Code) was constructed. Uniaxial compression tests were conducted to determine the microscopic parameters of the model, extracting information …
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It was found that when red mud, fly ash, and desulfurized gypsum are used to prepare road base materials, in the case of (CaO + Na 2 O)/(SiO 2 + Al 2 O 3 ) = 0.88, the UCS of road base materials ...
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Study on desulfurized gypsum used as cement retarder Jianmei Zhou* School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia, Baotou 014010, China ... final setting time can meet the use requirements of Portland cement, so it is feasible to use desulfurized gypsum as …
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the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO2 removed [3]. A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) [4]. A substantial amount of desulfurized gypsum is generated as a by …
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The results show that adding desulfurized gypsum, which accounts for 6% to 8% of the total mass of the cementitious material, has no adverse effect on the workability and can significantly improve ...
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Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO2 emissions. Therefore, the Chinese …
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The fast mass transfer between the gas and solid, long residence time and extensive heat transfer are benefit for gypsum decomposition, while, the original size of …
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the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO2 removed [3]. A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) [4]. A substantial amount of desulfurized gypsum …
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The synergistic effect of red mud – desulfurized gypsum - fly ash was found. ... (RM is 50%) are significantly lower than the requirements of # 42.5 cement in the Chinese standard GB175-2007 (Common Portland Cement) [17].
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Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious …
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An innovative approach suggests using titanium slag and flue gas desulfurized gypsum as substitutes for Portland cement for soil solidification. This study systematically evaluates the effects of titanium slag-flue gas desulfurized gypsum-Portland cement composite (TS-FGD-OPC composite) solidifier on the performance of …
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Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers.This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the …
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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 demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used these as the raw materials for the production of …
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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 …
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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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The effective and safe use of FGD gypsum in agricultural land is still debated in some countries even though its effectiveness in soil management has been reported in many studies. Thus, the changes in the levels of soil salinity, alkalinity, crop yield, and other physicochemical properties in different soil types and crops after …
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Flue gas desulfurization gypsum (FGDG) is a coal combustion by-product that can be used in various beneficial ways. This review summarizes the recent …
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Abstract. The 11 major electricity-generating coal combustion stations in the northern Great Plains have the potential to produce almost 1 million Mg of flue gas desulfurization gypsum (FGDG) annually, which …
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In recent years, the global production of flue gas desulfurization gypsum (FGDG) has surged, with annual emissions exceeding 255 million tons [].Currently, with the continuous increase in energy consumption and increasingly stringent environmental requirements, the production of FGDG in China has exceeded 100 million tons [].The …
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DOI: 10.1016/j.jclepro.2020.124777 Corpus ID: 226335113; Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road base materials
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desulfurized ash will increase proportionately (Wang et al. 2023; Yi et al. 2023), as illustrated in Fig. 1. The prevailing desulfurization technologies in the cur-rent scenario can be categorized into wet desulfurization technology, dry desulfurization technology, and semi-dry desulfurization technology based on the type of desulfuriza-
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Desulfurized gypsum is sent to the gypsum storage bin for storage after concentration and dehydration, and can be sold for reuse. The fog drops of the flue gas …
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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. The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum-based self-leveling mortar that can be …
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The saturated steam spray process meets the dechlorination requirements for FGD gypsum, significantly reduces the wastewater output of the dechlorination process, and provides the heat treatment …
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The addition of desulfurized gypsum was found to increase the mixing water demand and prolong the setting time, while reducing the strength. The resulting product still met building requirements. Yang et al. studied the effect of desulfurized gypsum on the properties of calcium sulfoaluminate cement. The results showed that FGDG can …
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Saline-sodic soil colloids contain a large number of exchangeable sodium ions,leading to soil aggregates breakdown,clay dispersion and soil pores blocking.Saline-sodic soils improvement requires two processes,providing calcium source to exchange with sodium on soil surface and removing salt through leaching or drainage.In this study,we used corn …
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The addition of a retarder lengthened the induction period of desulfurized gypsum and changed the morphology of desulfurized gypsum-hydrated crystal, thus extending the setting time and reducing the strength. Author Information. ... for temporary storage on one computer for purposes of viewing, and/or one copy of a …
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