most widely used and mature standard desulfurization process technology worldwide. It is the basic process for flue gas ... desulfurized gypsum slurry is recovered after being dehydrated by a dehydration device. When limestoneisusedasthe absorbent,SO 2 isconvertedin the absorption tower, and the reaction equation is as follows CaCO …
The test takes the cementing system composed of ordinary Portland cement and desulfurized building gypsum as the research object, and the research is carried out based on the mechanism of the early strength agent that can accelerate the cement hydration reaction in the composite cementing system. ... of the early strength agent …
Flue Gas Desulphurized Gypsum (FGDG) is a by-product generated by the thermal power industry to remove sulfur dioxide (SO 2) from flue gas emissions. This paper provides a comprehensive review of flue gas desulphurized (FGD) gypsum …
To resolve the limited large-scale methods of disposal of low calcium fly ash with poor activity, based on the double excitation principle, clinker and desulfurized gypsum are used as alkali/salt activators to …
CS desulfurization pH is not easy to control, easy to block the pipeline, gypsum moisture content is high, and dehydration is not easy. The pH of CS slurry is 12.45, and that of desulfurized gypsum is 3.33. The pH span is large and difficult to control, which will lead to the oxidation of CS desulfurized gypsum and the formation …
Abstract. High Resolution Image. Download MS PowerPoint Slide. The separation of sulfur from the wet limestone fuel gas desulfurization (FGD) gypsum using oxalic acid solution was studied. Optimal separation …
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 ...
Calcined gypsum as a low-energy material can be produced with advantage from the waste FGD gypsum by its dehydration at the temperatures of 110–150 °C. Then, β-form of calcined gypsum is formed according to the equation (1) CaSO 4 · 2 H 2 O → CaSO 4 · 1 / 2 H 2 O + 1 1 / 2 H 2 O.
desulfurized gypsum mortar system has explored the composition of cement, FA, and FGD through experiments [4]. The cement content is initially set at 10%-20% of the cementitious material, and FA is added. The amount is 10% to 60%, and the FGD is 20% to 70%; methyl cellulose ether is blended at 0.1% of the mass of ...
The chemical reaction between the limestone slurry and sulfur in the flue gas produces calcium sulfate, while the limestone slurry …
What is desulfurization gypsum. Desulfurization gypsum, also known as FGD gypsum (flue gas desulfurization gypsum), is an industrial by-product gypsum obtained by desulfurization and purification of flue gas …
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 …
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 …
Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6, 10], has been an important alternative ...
In this paper, waste gypsum from wet flue gas desulfurization (WFGD) mixed with NH 3 ·H 2 O was applied for CO 2 absorption in the solid-liquid-gas phase system. The effects of operation temperature, CO 2 flow rates, and ammonia-to-gypsum ratio on carbonation process were discussed. Meanwhile, a model for CO 2 absorption …
Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. ... The first occurs immediately after water is applied to the hydration reactions, in which the free C a O is converted to Ca ... The bearing capacity of the backfill materials can be obtained from the blow counts ...
To effectively solve the problem of recovery and utilization of flue gas desulfurized gypsum (FGDG), a new method for preparing SO 2 gas by adding a …
A flue gas desulfurization process capable of producing a high purity gypsum and also making equipment employed as minimum as possible is provided, which process comprises the steps of cooling and ...
Hydroxyl free radical (·OH) generated by Fenton reaction (Equation (1)) has been shown to effectively degrade numerous toxic pollutants [13], so the Fenton process is widely used as a ...
ical formula is CaSO 4·2H 2O, and pure gypsum is white in color. However, gypsum typically contains impurities, Received: 23 September 2019 | Revised: 9 February 2020 | Accepted: 10 February 2020 DOI: 10.1002/ese3.666 PERSPECTIVES Emission reduction process for dechlorinating flue-gas desulfurization gypsum and reducing wastewater …
DOI: 10.1016/j.jobe.2022.105368 Corpus ID: 252750931; Effect of curing temperature on the reaction kinetics of cementitious steel slag-fly ash-desulfurized gypsum composites system
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· …
Gypsum is produced by the desulfurization process, and mainly composed of calcium sulfate dihydrate and some impurities (Fu et al., 2019). As of 2016, China's desulfurized gypsum inventory reached 550 million tons (Wu et al., 2019). Coal gangue is a kind of solid waste discharged in the process of coal mining and coal washing.
The system diagram of reducing gypsum in the multi- stage and multi-atmosphere fluidized beds. Diagrammatize: 1 raw material; 2 pelleter; 3 adhesion material; 4 drying process; 5 circulating fluidized bed heater; 6 cyclone separator; 7 J type valve; 8 circulating fluidized bed reactor; 9 tubular air preheater; 10 dust collector; 11 draft fan; …
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. ... For better engineering applications, it is necessary to conduct more in-depth research on the reaction process …
Introduction. Flue gas desulfurization (FGD) is the removal process of sulfur dioxide (SO2) from flue gases. Sulfur dioxide in gases is produced by the combustion of fossil fuels and many industrial processes such as gasoline refining as well as cement, paper, glass, steel, iron and copper production.
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. ... Improving the removal of fine particulate matter based on heterogeneous condensation in desulfurized flue gas ...
The carbonized mineral was dry desulfurized gypsum (H Company, South Korea), and the CO 2 gas was of a reagent grade (purity: 99.9%). The content of dry desulfurized gypsum and mixing water was controlled to prepare a slurry, and distilled water was used as the mixing water.
ity standards for recyclable desulfurized gypsum obtained in the WFGD process operated in the Dangjin thermal power plant in the Republic of Korea [14]. 2. Process Modeling Fig. 3 illustrates the WFGD process modeled by Aspen plus. In this model, the reactions occur in the liquid phase. Thus, the ther-
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 …
The produced calcium sulfite (CaSO 3 ·2H 2 O) is then oxidized, resulting in FGDG. CaSO 3 ·2H 2 O (aq) + ½O 2 (g) ↔CaSO 4 ·2H 2 O (s) Natural oxidation …
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. ... 2 School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, …
The dehydration embrittlement process may arise from various mechanisms. First, there is a fluid volume change as well as a solid volume change as dehydration reactions proceed. ... The reaction extent calculated by formula, ... The dehydration reaction of gypsum into bassanite and water induces a large porosity …
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 …
The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was also studied by Monte Carlo (MC) simulations. The thermodynamic calculation results reveal that the dehydration mechanism of gypsum …
However, due to the low hydration activity of fly ash, the heat release during the entire hydration process is small, and the hydration reaction is slow, resulting in the problem of low early strength in the system of fly ash and desulfurized gypsum . In our previous work, the feasibility of using the calcined FGD gypsum and fly ash as the ...
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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 …
The influences of desulfurization gypsum on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study.