Based on the study of dry desulfurization, semi-dry desulfurization, and wet desulfurization, the research progress of various desulfurization processes, mass transfer mechanisms and process parameters are described. Table 2 summarizes the advantages and disadvantages of these methods and their desulfurization rates under …Web
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The semi-dry ue gas desulfurization ash (SFGDA) is an industrial waste generated by the semi-dry desulfurization process, and its resources have been continuously attracted …Web
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Flue gas desulfurization is a chemical process to remove sulfur oxides from the flue gas at coal-burning powerplants. Many FGD methods have been developed to varying stages of applicability ... Concrete pavements containing fly ash are very durable and cost effective. Between 1950 and 1970, concrete with fly ash contents as high as 50 percent ...Web
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Efficient capture of sulfur dioxide (SO2) in the preheater of the cement production system is the key to achieving process compatible flue gas desulfurization …Web
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This study investigates the effect of desulfurization slag (DS) and gypsum (G) on the compressive strength and microstructure properties of blast furnace slag-(BFS-) based alkali-activated systems. …Web
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In ammonia-based desulfurization process, SO 2 is commonly absorbed in the pH range from 5.0 to 6.0. It can be observed from Figure 3 that the distribution coefficient of SO 2 (aq) is nearly zero …Web
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Flue gas desulfurization gypsum (FGDG) is a type of industrial by-product sourced from the desulfurization process [26, 27]. The main compound of FGDG is CaSO 4 ·2H 2 O, which used to produce calcium sulfoaluminate cement [28], retard the setting of Portland cement [29] or produce hemihydrate gypsum by calcination [30]. More …Web
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Abstract. The development of sorbents for flue gas desulfurization in a dry mode is essential to control emission of sulfur dioxide. Based on the novel concept of "treating waste with waste", a low-cost and highly activated calcium-based sorbent (ACS) was prepared using coal fly ash, CaO and waste gypsum as the raw materials via the …Web
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Furthermore, in conventional concrete, the compressive strength increases with increase in strain and eventually decreases after a maximum point (until 0.17 mm/mm and 20 MPa). On the other hand, the compressive strength of sulfur-based concrete also has a linear relation with strain but having higher values (like 0.025 mm/mm and 40 MPa) …Web
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Using phosphogypsum (PG) as a raw material to prepare calcium sulphoaluminate cement (CAS) is an effective way of treating phosphogypsum. In order to meet the different application requirements of … Expand. 2. PDF. ... Coal power plants use the wet flue gas desulfurization (WFGD) process to remove sulfur dioxide (SO2) …Web
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The authors showed that the cement admixture of 6 to 12% introduced into the prepared mortars resulted in the formation of gypsum–cement mortars, which fulfill the requirements of the EN 13279-1:2008 standard concerning mechanical strength. ... Although the flue gas desulfurization (FGD) process has become an additional source of …Web
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The newly constructed carbide slag cement production equipment must use the novel dry cement production process. 4. ... The countries which mainly wet process desulfurization include Japan (accounting for 98%), the US (accounting for 92%), and Germany (accounting for 90%).Web
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cement and lime kilns, metal smelters, petroleum refineries, glass furnaces, and H 2 SO 4 manufacturing facilities. Approximately 85% of the FGD systems installed in the US are wet systems, 12% are spray dry and 3% are dry systems. Emission Stream Characteristics: a. Combustion Unit Size: SO 2 scrubbers have been applied combustion units firing ...Web
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In the cement industry, SO 2 and NOx are generally removed separately. There are many problems, such as large area, high investment cost, secondary pollution and so on. ... The desulfurization and denitrification process of cement kiln flue gas based on the coupling enhancement effect of C–CaO–SiO 2 is shown in Figure 8. Open in a …Web
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Improvement of Desulfurization Performances of Waste Cement Particles by Acid Treatment. Industrial & Engineering Chemistry Research 2009, 48 (7), 3303-3307. DOI: 10.1021/ie801312b. ... Review of desulfurization process for biogas purification. IOP Conference Series: Earth and Environmental Science 2017, 100, 012177. DOI: …Web
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2. Process Flow of Flue Gas Desulfurization System in Cement Plant Figure 1 shows the process flow chart of a cement kiln FGD system: As shown in Figure 1, the cement kiln wet desulfurization process uses the kiln ash collected by the bag filter at the end of the cement kiln as the desulfuri-zation absorbent.Web
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Hydration process was evaluated by hydration heat and pH value analysis. The morphology and structure of hydration products were characterized by SEM-EDS and pore structure, respectively. ... Water resistant blended cements containing flue-gas desulfurization gypsum, Portland cement and fly ash for structural applications. …Web
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Cement industry contributes to more and more SO 2 emission due to utilization of alternative raw materials and fuels, whereas the available calcium-based dry flue gas desulfurization (FGD) technologies present low efficiency due to slow reversible de-SO 2 reactions and short gas-solid contact time in the preheater.In the present study, …Web
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The semidry flue gas desulfurization (SFGD) ash (abbreviated as DA, CaSO 3), a by-product produced during the desulfurization process of steel enterprises, is increasingly accumulated with the emissions control of SO 2. ... The free water is partly pumped by vacuum dewatering process, the water-cement ratio and the volume of …Web
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In a properly operated new suspension preheater (NSP) cement line, the SO2 emission is mainly originated from sulfides in the raw meal, and limestone, …Web
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Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. Due to its abundance, chemical and physical properties, FGDG has been used in several beneficial applications. However, during the past decade, the rate of beneficially used FGDG has …Web
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Desulfurization slag (DS), generated from molten iron pre-desulfurization process, has a high alkalinity that may cause seriously environmental issues. To solve the DS-disposal problem, this research proposes a new type of cementitious material composited of DS, ground granulated blast furnace slag (GGBS), steel slag (SS), and …Web
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The vacuum dewatering was proposed to solve the problem of strength reduction caused by high free water content. The free water is partly pumped by …Web
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Phosphogypsum (PG) and flue gas desulfurization gypsum (FGDG) are industrial by-products with an annual production of about 30 million tons in China. They are usually treated as solid waste instead of being recycled efficiently. In this study, MgO powder was replaced with waste gypsum by weight of 10%–30% to prepare magnesium …Web
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The disposals of dredged sludge (DS) and desulfurization ash (DA) are both increasingly challenging due to land occupation and environmental pollution. This study …Web
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Desulfurized manganese residue (DMR) is an industrial solid residue produced by high-temperature and high-pressure desulfurization calcination of electrolytic …Web
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The 2 Types of Flue Gas Desulfurization. The flue gas desulfurization processes can be separated into two main categories: Once-through processes and regenerable processes. Once-through is also known as non-regenerable, and is a process that utilizes the sorbent as a beneficial by-product or disposes of it as waste.Web
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The desulfurization test was carried out on the prepared three kinds of Ca(OH) 2 crystals under the simulated environment of laboratory cement kiln flue gas. The desulfurization efficiency of hexagonal plate Ca(OH) 2 crystal prepared by SO 4 2− doping was the best, up to 93%, and only decreased by 6% within 10 min, the desulfurization ...Web
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Direct mineral carbonation (MC) is used to mitigate carbon dioxide (CO2) emissions. This method has the great advantages of reducing the amount of industrial residues and creating valuable materials by incorporating CO2. Waste gypsum, industrial waste including flue gas desulfurization (FGD) gypsum (25.27–53.40 wt% of CaO), and …Web
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Desulfurization slag is an industrial by-product of steel plants. Desulfurization slag was passed through a #4 sieve. 4. The fine aggregate conforms to the natural sand size in ASTM C778 [27] graded particle size. Slump flow. Fig. 1 shows the results of the slump flow test as desulfurization slag is added to the cement mortar with …Web
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