The 11 major electricity-generating coal combustion stations in the northern Great Plains have the potential to produce almost 1 million Mg of flue gas desulfurization gypsum …

The main component of desulfurized steel slag is calcium sulfate, which is similar to desulfurized gypsum. Steel slag is originally strong alkaline, but it becomes neutral and weak acidic substances after absorbing SO 2 in the process of flue gas desulfurization (Meng et al., 2018, 2019; Ying et al., 2021). Therefore, it could be expected that ...

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 …

In response to the basic policy of green and low-carbon circular development to solve resource, environmental and ecological problems, gypsum is considered to be a filling material for mine backfilling. To explore the potential risks of gypsum to the groundwater environment due to the backfilling of abandoned mines, a sequential batch leaching …

Flue gas desulfurized gypsum (FGDG) is an industrial by-product discharged from thermal power plants, smelters, and large-scale enterprise boilers. It is produced when sulfur is removed from flues gases in the flue gas desulfurization (FDG) system, and the formation processes are shown by the following equations (Liu et al., 2021).

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 …

This research aims to study the utilization of waste from power plants, construction and demolition, and agriculture by varying the ratios of flue-gas desulfurization (FGD) gypsum, construction and demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used these as the raw materials for the production of concrete bricks of 15 × 15 × 15 …

In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) gypsum were comparatively investigated. Moreover, the …

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 ...

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 ... sizes of the wastewater evaporation products with high concentrations of Ca 2+ and Na + ions are smaller than those of FGD gypsum. The main component is similar to that of FGD gypsum and ...

The main component of desulfurized steel slag is calcium sulfate, which is similar to desulfurized gypsum. ... 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; …

Untreated FGD gypsum is mainly composed of calcium sulfate and can be recycled in main industrial fields . 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.

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 ...

Abstract. As a relatively fast-setting building material, desulfurized gypsum is difficult to use. Citric acid, sodium gluconate, and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined retarders. The effects of the retarder type and content on the setting inhibition and mechanical properties of desulfurized …

Chloride ion has an important influence on the performance of gypsum board prepared by desulfurization gypsum, especially in wet environment. Therefore, this paper analyzed the influence of ...

Flue gas desulfurization gypsum (FGDG), a solid waste produced during sulfur removal in coal-fired power plants, has applications in saline-alkali soil amelioration due to its function of calcium‑sodium ion exchange. Existing research has focused on the use of gypsum to improve saline-alkali soils in non-coastal areas. However, coastal areas are not only …

One of the most important properties of FGD gypsum is its high purity. FGD gypsum is typically more than 90% pure calcium sulfate dihydrate, with minimal impurities. This high purity makes FGD gypsum ideal for use in a variety of manufacturing processes, such as the production of cement and wallboard [4].

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 …

The extensive use of marble and gypsum products is increasing in construction industry and limited amount of natural sources are available, which requires alternative sources of calcium-rich raw ...

1. Introduction. BPG is an industrial solid waste primarily composed of calcium sulfate. Its main components include desulfurized gypsum (DG), phosphogypsum (PG), and titanium gypsum (TG), with smaller amounts of fluorogypsum, salt gypsum, and others [1,2,3].Figure 1 shows the distribution proportions of BPG sources in China. BPG contains various impurities and harmful …

Industrial developed countries have better solved technical problems such as the transportation, drying, modification, and application of desulfurized gypsum. The gypsum …

Desulfurization wastewater is industrial wastewater with a high salt content, high metal ions, and high hardness produced by flue gas desulfurization of the limestone-gypsum method in coal-fired power plants. This paper summarizes the source of desulfurization wastewater, water quality characteristics, water quality impacts, and other factors, combined …

After calcination at 220 °C, anhydrous gypsum is the main component of desulphurisation gypsum. From the above results, it can be concluded that starting from 120 °C, hemihydrate gypsum gradually starts to appear in the product. ... Silage and flue gas desulfurized gypsum as additivesimprove green waste composting. J. ENVIRON. CHEM. ENG., 11 ...

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. Main chemical components of desulfurized building gypsum

Industrial byproduct gypsum (BPG) is a secondary product that is mainly composed of calcium sulfate discharged during industrial production. BPG primarily consists of desulfurized gypsum, phosphogypsum, and titanium gypsum, which account for 88% of the total BPG in China. The large-scale utilization of these three types of solid waste is crucial for the …

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. Ordinary Portland cement …

Applying Gypsum to Wisconsin Soils Dick Wolkowski, Extension Soil Scientist The interest in the use of gypsum in crop production has increased in Wisconsin for a variety of reasons. The installation of "scrubbers" at coal-fired power …

Chen [] made statistics on the main physical phases of CDA from steel plant sintering machines and coal-fired power plants, and the results are shown in Table 2.Among the many components, CaSO 3 contains the highest percentage, which is generated by the reaction between SO 2 and lime in the flue gas. The CaCO 3 content is also higher because the flue …

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.

The use of FGD gypsum has significant environmental benefits, including reducing the amount of waste sent to landfills and reducing the need for natural resources. …