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-
CaCO3 is often used as an additive in many industries. However, additional functions are required to expand its applicability. This entails modification of its physicochemical properties. Accordingly, in this study, a particle …
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 …
In the first part, steel slag (SS), blast furnace slag (BFS), fly ash (FA), and desulfurized gypsum (DG) are separately ground and mixed properly to prepare a solid waste AUP, and the effect of ...
This paper studies the effect of desulfurized gypsum and 1% hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement, and …
The desulfurized building gypsum used in the test was provided by Chongqing Muchuan Gypsum Building Materials Co., Ltd., which was light yellow and had gelling properties after being mixed with water.The main chemical components and main physical performance indexes of desulfurized building gypsum are shown in Table 1 and Table 2. Table 1.
The most popular desulfurization technology is wet-FGD using limestone, with the product called FGD-gypsum, which main content is CaSO 4. According to the ... First is evidently positive effect. The emergence ratio and yield of the plants grown in the soils ameliorated with FGD gypsum was 1.1–7.6 times and 1.1–13.9 times those of the ...
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 …
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 …
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, …
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) …
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;
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 …
The utilization of solid wastes (SWs) as a potential resource for backfilling is not only conducive to environmental protection but also reduces the surface storage of waste. Two types of SWs, including fly ash (FA) and desulfurized gypsum (DG), were used to prepare cementitious backfilling materials for underground mined-out areas. …
Abstract: To resolve problems caused by the accumulation of flue gas desulfurization gypsum (FGDG) in the environment, a polymer material was prepared …
Oman Gypsum quarry is located 19 km South of Thumrait city, Salalah. Thumrait is the nearest city. ... Commercial- ly, limestone powder is used in antacids as filler in various industry, VIEW ALL PRODUCTS. Contact. OMAN INDUSTRIES GYPSUM L.L.C P.O BOX 101, SALALAH -218 SULATANATE OF OMAN Help Line. 00968-95416949 ...
To solve the problems of difficult treatment of desulfurized gypsum and overmining of limestone, a kind of lime/gypsum flue gas desulfurization (FGD) …
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 …
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 ...
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 …
The test results show that sodium sulfate has a poor improvement effect on the sample due to the presence of desulfurized building gypsum in the composite cementing system, while calcium chloride ...
Using SEM at a magnification of 8000×, photographs of desulfurized gypsum and carbide slag were taken, as shown in Fig. 1. From the images, it can be observed that the desulfurized gypsum appears as elongated blocky shapes, distributed loosely, while the carbide slag appears as small spherical granules, distributed evenly …
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 …
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 …
Considering the properties of desulfurized ash and desulfurization gypsum, suspended separation of impurities in the desulfurized gypsum was studied in an unbaffled, fat bottom, cylindrical ...
The compaction effect and settlement were assessed through field tests. Abstract. Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of …
Research on the application of gas-liquid mass transfer and desulfurization gypsum in the limestone-gypsum process has shown that the desulfurization rate can reach as high as 99.46% [102]. Desulfurized gypsum can not only improve saline-alkali soils and increase crop yields; it can also be used as an additive to make cement, …
This shows that reducing the harmful elements in FGD gypsum is an important problem that needs to be solved when using FGD gypsum as fertilizer. The effect of FGD gypsum on crop growth and …
Special attention is required on the fine particle control after desulfurization because a large quantity of fine particles are emitted into the atmosphere from the coal-fired power plants. 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 …
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 …
Semidry desulfurization and wet desulfurization in a furnace are usually used in the circulating fluidized bed boiler in the power production of thermal power plants, and these two approaches lead to high calcium content in the fly ash and bottom slag of circulating fluidized beds and produce abundant flue-gas desulfurized (FGD) gypsum …
Thermal Power Plant generates FGD gypsum as by-product during coal combustion. This study evaluates the characterization (spectroscopic and elemental), potentially toxic elements (PTEs ...
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 ...
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 …
i) Analyse the physical and chemical properties of FGD gypsum and compare them with traditional raw materials, such as natural gypsum and OPC. ii) …
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) …
1.1. Flue gas desulfurization processes. The flue gas desulfurization (FGD) processes can be separated into two main categories: once-through and regenerable processes, depending on how the sorbent is treated after SO 2 adsorption (Srivastava and Jozewicz, 2001).Once-through, or non-regenerable, processes utilize the sorbent as a …
DOI: 10.1016/j.cscm.2024.e02907 Corpus ID: 267121627; The effects of desulfurized gypsum on the mechanical properties of dredged clay with high initial water content stabilized by ternary geopolymer