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Desulfurized ash from semi-dry flue gas desulfurization and α-hemihydrate gypsum were collected from Baotian New Building Materials Co.,Ltd. Their chemical components are shown in Table 1.Desulfurized ash contains about 21.33% hemihydrate calcium sulfite, 18.11% calcium carbonate, 28.55% dihydrate gypsum, 25.81% calcium …
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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 …
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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) …
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Desulfurized gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from flue gas from burning coal or oil. The technology …
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Effect of curing temperature on the reaction kinetics of cementitious steel slag-fly ash-desulfurized gypsum composites system. Author links open overlay panel Siyu Duan a, Hao Wu a, Ke Zhang a ... [16] used grinding steel slag powder with a size of 0–5 mm to produce composite cement with strength classes of 42.5 and 32.5 of …
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Gypsum, a widely used mineral in the construction and pharmaceutical industries, is processed into powder for various applications. The production of gypsum powder and desulfurized gypsum powder, a byproduct of flue gas desulfurization, has become increasingly important due to its environmental benefits and economic value. Types of …
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Tens of millions of tons of desulfurized gypsum can be produced in China every year. Desulfurization gypsum is used as an admixture to replace part of cement in concrete. And the smaller the particle size of desulfurized gypsum, the better the mechanical properties of cement mortar. The compressive and flexural tests show that the cement mortar with …
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After pre-dryed, it is lifted to the furnace to be calcined. After being calcined, it is sent to the silo. The FGD gypsum powder machine has adopted advanced technology in the whole system. Standard Final product from desulfurized gypsum powder production line 1. Quality：meet the national stander of GB9776-88. 2. Finess：≥80meshes。 3.
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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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Three batches of desulfurized gypsum with different chloride ion content were used to prepare gypsum . board. ... China Powder Technology, 2008,01:46-49.
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The mixtures with the G-slag powder had higher compressive strength, resistance to chloride, and gas permeability than the mixtures produced with ordinary …
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The invention generally relates to the technical field of desulfurized gypsum recycling, and provides a method for preparing high-strength ceramic mold gypsum powder by using desulfurized gypsum, which comprises the following steps: it comprises the following steps: s1, pre-drying; s2, frying; s3, grinding; s4, aging; s5, magnetic separation and iron …
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The Key Application Technology of Desulfurized Gypsum in Dry-Mixed Mortar Guangxu Fang *, Jin Pan, Rui Ma, Huan Wang, Jipeng Wang ... large-scale application of fly ash and slag powder in mortar. Desulfurized gypsum is an industrial by-product gypsum obtained after flue gas desulfurization in coal-fired or oil-fired power plants [1]. Its main ...
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To effectively solve the problem of recovery and utilization of flue gas desulfurized gypsum (FGDG), a new method for preparing SO2 gas by adding a mixture of FGDG and pyrite into a boiling furnace and utilizing its high-temperature waste heat is proposed. Using the FactSage 6.1 Reaction module and the Equilib module, the …
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In this sense, silage (SG) and flue gas desulfurized gypsum (FGDG) are two good choices as composting additives. SG is made from the roughage obtained by cutting corn, sorghum, and other forage crops and grass; the roughage is then subjected to anaerobic fermentation by lactic acid bacteria, which results in the generation of SG [19].
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Semidry desulfurization and wet desulfurization in a furnace are usually used in the circulating fluidized bed boiler in the power production of thermal power plants, and these two approaches lead to high calcium content in the fly ash and bottom slag of circulating fluidized beds and produce abundant flue-gas desulfurized (FGD) gypsum …
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The influences of desulfurization gypsum on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study.
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The yield and quality of the FGD gypsum depend on parameters such as operating mode, type of fuel/sulfur content, and the type of absorbent desulfurizer technology used. 20 Since the late 1970s, European coal power plants have produced over 100 million tons of FGD gypsum. 21 In 2003, 17 European countries produced 15.2 …
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The effect of cement content change on the consistency of sulphurised gypsum-based mortar 3.2 The influence of FGD on the performance of cement-fly ash-slag powder composite cementitious …
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A titanium slag powder (TS) was used, which was obtained from Pangang Group Co., Ltd. A flue gas desulfurized gypsum (FGD) was also used, which was obtained from Baogang Building Materials Co., Ltd. The main mineral phases of TS are amorphous with some titanium carbide (TiC) and the mineral phase of FGD is mainly …
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Gypsum deposits were formed during the Paleozoic Era, approximately 600 million years ago, when most of the Earth's surface was covered by salt water. Gypsum is composed of 79.1% calcium sulfate …
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Like natural gypsum, the application of flue gas desulfurization gypsum (FGDG) with irrigation provides economic and environmental value (Wang and Yang, 2018; Watts and Dick, 2014). FGDG is of low cost, because it is a side product of sulfur removal from fuel combustion in coal-fired power plants and does not require mining and …
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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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from Desulfurized Gypsum with High Chloride Ion Content To cite this article: Dongjie Yin et al 2020 IOP Conf. Ser.: Mater. Sci. Eng. 740 012048 ... desulfurized gypsum powder was added,
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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 …
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At present, the industrial utilization of desulfurized gypsum has become one of the main research directions of scholars. Comprehensive utilization of desulfurized gypsum conforms to the concept of green and low-carbon development. ... The combination of FGD gypsum and slag powder provides synergistic benefits above that …
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Natural gypsum powder is made of dihydrate gypsum (CaSO4.2H2O) after crushing, grinding, calcining, cooling and homogenizing, aging and packaging.The core technology of gypsum powder production is calcination (dehydration) system. ... As the temperature of the desulfurized gypsum increases, the free water in the desulfurized […] ...
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