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Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
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The effect of desulphurisation gypsum dried at different temperatures on the performance of the solid waste-based geopolymer grouting materials was explored. The mechanical properties, phase composition, and microstructure of the grouting materials were determined using a universal testing machine, X-ray diffraction, scanning electron ...
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With the increasing attention on SO3 emission in coal-fired power plants, the removal of SO3 acid mist in a limestone-gypsum wet flue gas desulfurization (WFGD) system was investigated. The generation properties of SO3 acid mist were analyzed with an experimental system, and the effects of flue gas properties and technologies for ultralow …
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Abstract. As a relatively fast-setting building material, desulfurized gypsum is difficult to use. Citric acid, sodium gluconate, and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined retarders. The effects of the retarder type and content on the setting inhibition and mechanical …
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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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With the increasing attention on SO 3 emission in coal-fired power plants, the removal of SO 3 acid mist in a limestone-gypsum wet flue gas desulfurization (WFGD) …
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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.
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a limestone stream mixer (MIXER) is considered, although this does not exist in the actual process. It mixes the two streams of low-grade (LIME1) and high-grade limestone (LIME2). This stage was added to predict the mixing ratio of limestone that can allow the use of low-grade limestone and high-grade limestone. The sec-
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Thermal Power Plant generates FGD gypsum as by-product during coal combustion. This study evaluates the characterization (spectroscopic and elemental), potentially toxic elements (PTEs ...
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However, the use of granular limestone made a neutralization column necessary to ensure the rubbing of the limestone particles in it. This kept the limestone …
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The soil nutrient content of the ameliorated saline-alkali soils with different ages,and the diurnal courses curve of photosynthetic parameters,photosynthetic light response curve and yield of oil-sunflower(Helianthus annuus) grown on the ameliorated soils were measured to investigate the effects of desulfurated waste residue additions on the saline-alkali …
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Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains unclear. ... Ettringite-based binder from ladle slag and gypsum–The effect of citric acid on fresh and hardened state …
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Introduction. Flue gas desulfurization gypsum (FGDG) is an industrial byproduct produced by limestone-gypsum wet desulfurization to treat SO 2 produced by thermal power plants and coal-fired plants, whose main component is CaSO 4 ·2H 2 O. In wet desulfurization, 1 t of SO 2 produces about 2.7 t of FGDG [1], [2]. Some 130 million …
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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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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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The grindability of desulfurized gypsum is better than natural gypsum, and the desulfurized gypsum itself is a fine powdery material. When grinding, it has a grinding effect on clinker and other mixed materials, make the cement with much more fine particles and a significantly larger specific surface.
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In this study, a simulated limestone–gypsum WFGD platform was used to study the emission characteristics of water-soluble ions in flue gas after desulfurization. …
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produced from desulfurized gypsum for a range of industrial applications. In the experiment, fatty acids were used to modify the CaCO 3 surface, and the scale of the modification effect was
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4 2O, generally referred to as dihydrous gypsum), which includes moisture determination of two molecules within the structure [19]. For carbon dioxide fixation, this desulfurized gypsum is reacted with ammonia under a flow of carbon dioxide or with ammonium carbonate ((NH 4) 2CO 3) obtained from the reaction betw een carbon dioxide and …
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The synergistic effect of red mud – desulfurized gypsum - fly ash was found.. Sample RDFC6 achieved high content of solid waste and high mechanical performances. • The influence of synergistic effect on …
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For the control of fine particle emission after desulfurization, the effect of gypsum crystallization characteristics during limestone-gypsum wet flue gas …
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Aimed to improve the removal efficiency of fine particles during the limestone-gypsum wet flue gas desulfurization (WFGD) process, a novel technology …
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To solve the problems of difficult treatment of desulfurized gypsum and overmining of limestone, a kind of lime/gypsum flue gas desulfurization (FGD) collaborative desulfurized gypsum resource utilization process (LCS) was proposed. The system mainly includes the LCS-LFGD (lime/gypsum flue gas desulfurization system), …
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In an attempt to figure out the transformation of fine particles during the limestone gypsum desulfurization, the physical properties of fine particles before and after the desulfurization system were measured in a power plant.
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According to the U.S. Energy Information Administration's statistics, in the 2006–2016 period, approximately 42% of the electricity consumed in the U.S.A was produced by coal combustion (U.S. Energy Information Administration, 2018).The coal combustion process generates various types of residues such as fly ash, bottom ash, …
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Geopolymer is an emerging green cementitious material that can be used to stabilize dredged clay (DC) as construction materials. This paper presented an experimental study on the effects of desulfurized gypsum (DG) on the mechanical properties (e.g., stress-strain characteristics, unconfined compressive strength (UCS) and water stability) …
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The resulting product still met building requirements. Yang et al. [11] studied the effect of desulfurized gypsum on the properties of calcium sulfoaluminate cement. The results showed that FGDG ...
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The results showed that when the content of desulfurized gypsum after 80 °C heat treatment was 4% of Portland cement, the initial setting time was 136min, and the …
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The impact of desulfurized gypsum on soil carbon sequestration was most pronounced within 0~7 days after application, with the greatest effect observed at an application rate of 40 t·hm-2. Furthermore, correlation analysis indicated that changes in soil carbon storage were significantly associated with soil pH, soil salinity ...
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i) Analyse the physical and chemical properties of FGD gypsum and compare them with traditional raw materials, such as natural gypsum and OPC. ii) …
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ization gypsum. Unfortunately, these additives have negative effects on the mechanical properties of desulfurization gypsum, limiting the application and promotion of desulfur-ization gypsum material. In addition, adding insulating aggregates improves the thermal insulation performance of desulfurization gypsum, but reduces the mechanical ...
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Research on water-resistant gypsum blocks made from flue gas desulfurized gypsum," Comprehensive utilization of fly ash ... Effect of desulphurization gypsum on the strength and microstructure of the sludge ash cementitious system," J. Zhengzhou Univ. (Eng. Sci.)
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The effects of adding an organic acid or using a limestone with a fine particle size distribution (PSD) have been examined in a wet flue gas desulphurisation …
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Effect tests indicate that L/G has the most significant influence on the degree of desulphurization. The interactions of L/G with pH, and with v, both play …
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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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Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base materials based on the different (CaO + Na 2 O)/(SiO 2 +Al 2 O 3) molar ratio, and its mechanical properties, durability, microstructure and …
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