Desulfurized Gypsum Crystal Environment Ph Value
Review A comprehensive review of flue gas desulphurized …
Five concentrations of 1.0–3.0 mM were considered for each modifier, with 0.5 mM as intervals. Our results show that the effect of GA is very small, while TA and CA can …
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Effect of desulfurized gypsum whiskers on the adsorption …
Sintering process made red mud and desulfurized gypsum whiskers adhere evenly and closely, inducing the spilling out of crystal water to form porous structures favorable for the adsorption of Pb(II). ... until to a constant pH value. Put 100 mL of Pb ... resulting in a carbon-thermal reaction environment. In the regulation of crystal growth, ...
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Review A comprehensive review of flue gas desulphurized gypsum …
Although most heavy metal leaching values from the carbonate end-product stay below non-hazardous limits, the release of some heavy metal leachates from the carbonate end-product may limit reuse options for these materials. ... The controlled synthesis of α-hemihydrate (α-HH) gypsum using flue gas desulfurized gypsum is essential for the ...
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Application of flue gas desulfurization gypsum improves multiple
It was found that the application of desulfurized gypsum could significantly increase crop yield by 91.2% ± 22.5% (average 95%), and reduce soil exchangeable sodium percentage (ESP) by 37.4% ± 9.6% and pH value by 8.1% ± 1.7%.
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A Comprehensive Evaluation of the Effect of Desulfurized Gypsum …
ObjectiveIn order to comprehensively study the effect of desulfurized gypsum in improving saline-alkali soils, this paper statistically analyzed the change characteristics of soil pH value, exchangeable sodium percentage (ESP), soil electrical conductivity (EC), and crop yield after applying 0~60 t·hm -2 desulfurized gypsum in the northwest, north, northeast, and coastal …
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AMELIORATION OF ALKALIZED SOLONCHAK SOILS BY …
DG application rate, the values of pH, exchangeable sodium percentage (ESP) and electrical conductivity (EC) of the soil layer up to 40 cm from the surface were decreased by 11.0%, 38.1% and 34.5%, respectively, than those of the control which had no blind ditch and DG treatment in the first year. The yield of Chinese wolfberry
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Utilization of low-quality desulfurized ash from semi-dry …
The results show that: (1) in the environment of a single salt solution, K^+ ion, 〖Mg〗^(2+) ion, 〖Na〗^+ ion, and 〖Cl〗^- ion will cause sagging deformation of desulfurization gypsum ...
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Application of flue gas desulfurization gypsum improves multiple
Saline-sodic soils (i.e., electrical conductivity (EC) > 4 dS m −1 or pH > 8.5) cover ∼10% of the global land surface and deliver various ecosystem services for at least 75 countries (Szabolcs, 1994; U.S. Salinity Laboratory Staff, 1954).However, the quality of saline-sodic soils is low due to poor soil structure and low water and nutrient retention and organic matter content …
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Recent advances in flue gas desulfurization gypsum …
After one year at a gypsum rate of 20 Mg ha −1, soil treated with FGDG had pH levels lower than the untreated soil, and lower than the soils treated with natural gypsum, …
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Insight into Influence of Glycerol on Preparing α-CaSO4
Liu et al [4] [5] [6] discussed the effect of pH on the growth of desulfurized gypsum whiskers with desulfurized gypsum. However, there are different kinds of impurities in the industrial by ...
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(PDF) Performance Analysis and Improvement of Gypsum …
Performance Analysis and Improvement of Gypsum Board Prepared from Desulfurized Gypsum with High Chloride Ion Content March 2020 IOP Conference Series Materials Science and Engineering 740(1):012048
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Reclamation of saline-sodic soil properties and improvement of rice
In actual sodic soil amelioration, the application rate of gypsum often exceeds the requirement of the upper 20 cm soil layer (Zhao et al. 2020), and calcium and sodium equilibrium might occur in ...
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Comparative Analysis of Hydration Expansion Performance of Desulfurized …
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Open Access proceedings Journal of Physics: Conference …
alkali soil, and gypsum has no toxic side effects on plants, moderate solubility and easy to transport, gypsum has become the most common saline-alkali soil improver [2]. Using desulfurized gypsum in improving saline-alkali land not only solves the problem of using desulfurized gypsum, but also solves
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Characterization of flue gas desulphurized (FGD) gypsum of …
The FGD gypsum samples had an average pH value of 8.73 and EC 4.87 dS m −1. The calcium carbonate percentage ranged from 15 to 17% for different FGD gypsum …
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Influence of Calcined Flue Gas Desulfurization Gypsum and …
The direct heaping of FGD in the natural environment also results in land occupancy and environmental pollution . 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.
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Basic characteristics and comprehensive utilization of FGD gypsum
While naturally occurring gypsum agglomerates, FGD gypsum exists as a single crystal particle (30-60 µm), decreasing material strength (Zhang et al., 2020). Additionally, WFGD gypsum's high water ...
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Flue Gas Desulfurization Gypsum
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 gypsum is incorporated into the …
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(PDF) AMELIORATION OF ALKALIZED SOLONCHAK SOILS BY …
This study aims to investigate the subsurface gravel ditches and desulfurization gypsum (DG) as amelioration methods for alkalized solonchak soils in Gansu Jingyuan of China (37°02' N, 104°96' E).
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Combined Application of Flue Gas Desulfurization Gypsum …
Flue gas desulfurization (FGD) gypsum and straw return have been recognized for their roles in reducing soil sodicity and improving soil organic matter. However, there are few studies on the effect of their combination on improving and fertilizing sodic soil. FGD gypsum at a rate of 15 t ha−1 and three types of straw (sunflower seed shell, corn stover, and corncob …
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Investigation on performance improvement of dredged …
The pH value of the stabilized DS exhibited a significant increase, reaching its peak at a DG content of 8%. ... the alkaline environment suitable for stabilizing DS using the binary AAMs needs to be discussed. ... Zhang W (2021) Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road ...
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Experimental investigation of utilizing waste flue gas desulfurized …
Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. ... Crystal water; WFA: ... The settlements were recorded at three different places and the average value was calculated. Fig. 13 showed the relationship between the pressure and the settlement of the same location ...
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Effect of maleic acid and pH on the preparation of α
Although α-CSH from desulfurized gypsum (FGD) ... When pH value is 1, the crystals of samples are fine needles. With the increase in pH value, the crystal structure of samples is fine prisms, and the aspect ratio of the crystals gradually decreases. ... In an alkaline environment, Ca(OH) 2 precipitate formed adheres to the crystal surface to ...
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High value-added utilization of desulfurized building …
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 …
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Improvement in Water Resistance of Desulfurized …
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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Effect of Low pH on Forming Process of Desulfurization …
pH of acidic solution can affect the crystal morphology and properties of gypsum hydration products by the dissolution-crystallization process of hemihydrate gyp-sum. MF was the …
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Comparative Analysis of Hydration Expansion Performance of Desulfurized …
[1] Yu D. G., Yang X. Y. and Yang S. Z. 2006 A Research on the Properties and Microstructure of Hemihydrate Gypsum Journal of Wuhan University Technology 28 27-29 Google Scholar [2] Kong Y. S., Zhang J. Z. and Kong R. Q. 2016 Researches on Copper Alloy Plaster Precision Casting Process Foundry Technology 37 1071-1073 Google Scholar [3] …
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Effects of Desulfurized Gypsum Addition on Saline-alkali …
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 soils.The results showed …
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A brief review on flue gas desulfurization gypsum recovery …
Abstract. The past several years have witnessed great progress in utilization of industrial waste gypsum. Newly developed carbonation technology toward CaCO 3 preparation also reveals a …
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(PDF) Study on the Improvement Effect of …
As the waste of coal-fired power plant, desulphurization gypsum is mainly composed of CaSO 3 and CaSO 4, which can replace Na+ in saline-alkali soil to improve saline-alkali soil.
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