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In order to protect national grain safety and ecological safety and develop a sustainable economy,it is important to improve alkaline land with desulfurized gypsum from coal fired power plants.Representative lightly alkalized soil,medium-alkalized soil and seriously alkalized soil in Xidatan of Ningxia Province were selected in the research and used in …
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This work aimed to investigate the feasibility of utilizing the low-quality desulfurization ash from semi-dry flue gas desulfurization by mixing with α-hemihydrate gypsum, and then the environmental issues resulted from low-quality desulfurized ash from semi-dry flue gas desulfurization can be resolved, and both economic and …
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The by-product of wet flue gas desulfurization, desulfurized steel slag (DS), had chemical characteristics like natural gypsum that can be used to improve saline-sodic soil.
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Desulfurized gypsum, a by-product of thermal power plants for removal of sulfur from coal, may be used as an external source of Ca2 + for reclamation of saline-sodic soil in this plain because it ...
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Therefore, it could be expected that DS could be used as the amendment of saline-sodic soil. As a soil amendment, the use of desulfurized gypsum has been widely studied (Chen et al., 2001; Clark et al., 2001; Cui et al., 2021; Koralegedara et al., 2019; Zhao et al., 2019). It could alleviate the harms of high alkalinity and excessive salinity ...
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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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SIG is the leading natural gypsum producer & exporter from Sultanate of Oman. We are located at Salalah in the Dhofar governorate, which is the southernmost part of Oman. Our gypsum mines are located at Thumrait, around 80 km from Salalah city. SIG's gate way to the world is the Port of Salalah.
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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 …
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in the form of commercial-grade gypsum that could be used for wallboard manufacturing. When salable gyp-sum is not attainable, dry FGD waste is piled (gypsum stacking) or …
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The main utilization method of FGD gypsum is still used in construction materials (Ye et al., 2019). As an auxiliary material or instead of natural gypsum, it can be widely used in concrete, walls, concrete, etc. It is the best way to use desulfurized gypsum in large quantities, but its economic value is relatively low (Pedreno-Rojas et …
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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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Gypsum was effective in reducing concentration and load in one of the two study years: P and NH 4 –N in 2009 (up to 83%) and NO 3 –N in 2011 (up to 73%). A …
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5. FGD gypsum can be partially substituted for cement to produce high-strength building materials, reducing the carbon footprint and building materials cost, …
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Paste backfill prepared with ultrafine tailings often faces difficulties in meeting engineering requirements. To address the challenge of using ultrafine tailings, this work utilized a slag cemented ultrafine tailings paste backfill (SCUPB) composed of slag, Portland cement, and desulfurized gypsum as the cementitious materials, with a …
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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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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 main purpose of the use of FGDG as a fertilizer is to provide Ca and S for plant growth. ... Synthetic dyes, used in several industries, are prevalent water …
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Jonoub Gypsum's Lamerd mine in Fars boasts 70Mt of gypsum reserves.Meanwhile, Samim Derakhshan controls 60Mt of gypsum reserves in neighbouring Hormozgan Province, where it aims to establish a 1Mt/yr mine. The Iranian gypsum wallboard industry is a relatively minor customer for producers' gypsum, of …
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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] .
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of desulfurized gypsum conforms to the concept of green and low-carbon development. Therefore, full research on the comprehensive performance of …
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See Table 1 for composition of main elements of desulfurized gypsum and cement clinker. ESMA 2020 IOP Conf. Series: Earth and Environmental Science714 (2021) 032048 IOP Publishing ... so it is feasible to use desulfurized gypsum as cement retarder. At the same time, it can also be seen that the setting time of Portland cement ...
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Mercury release is also a problem in desulfurized gypsum that is used to produce building materials like gypsum. These problems highlight that if not enough emphasis is put on mercury control in coal ash and desulfurized gypsum, mercury emission control measures at coal-fired power plants will not be effective because the …
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FGDG: flue gas desulfurization gypsum. Numbers denote response ratios which are converted to percentage changes (%) and are marked with stars (*) to indicate whether the responses are statistically significant. Lines and arrows denote the main impacts of FGDG application on soil properties, crop yields, plant seedling emergence, …
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In order to solve the global problem of bridge head jumping caused by the insufficient compaction of the roadbed in the transition section of highways and bridges, a desulfurization gypsum–fly ash flowable lightweight soil without vibration, capable of self-compaction, low bulk density, and economic and environmental protection, has been …
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With steel slag and desulfurized gypsum as main raw material,mixed appropriate amount slag and compound addition a little of activator,and based on orthogonal test,we explored the slag dosage,the proportion of the combined admixture activator and the desulfurized gypsum dosage impact on the performance of clinker-free cementing material,such as …
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Aug 13, 2020 Main uses of power plant desulfurization gypsum The difference between desulfurized gypsum powder and general gypsum powder is the difference in physical composition The desulfurized gypsum powder also contains silica, sodium oxide, calcium carbonate, calcium sulfite, limestone, calcium chloride, magnesium chloride, etc …
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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 use of FGD gypsum as a soil amendment is well known and has been investigated ..., 1 chloride content in the desulfurized gypsum should be reduced to ...
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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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The desulfurized gypsum not only has a high content of gypsum (> 900 g kg − 1) but also has a low price < 50¥ t − 1. We therefore conducted a study to determine how effective desulfurized gypsum is at reducing sodicity, improving the physical and chemical properties of the soil, and improving the growth and yield of rice in these saline ...
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