According to the ACAA (American Coal Ash Association), 1 chloride content in the desulfurized gypsum should be reduced to below 400 ppm. ... the emission reduction process includes high-temperature treatment and purification of FGD gypsum. Therefore, using the emission reduction process in coal-fired plants can save costs and …
With emission control becomes more and more stringent, flue gas desulphurization (FGD) is commonly employed for desulfurization. However, the …
1. Introduction. Flue gas desulfurization gypsum (FGDG) is a type of industrial auxiliary gypsum obtained by desulfurization and purification of flue gas generated after the combustion of sulfur-containing fuel (e.g., coal) [].Its main component is SO 2, which reacts with CaCO 3 and generates calcium sulfate dihydrate (CaSO 4 ·2H 2 O) through forced …
Desulfurized gypsum-high-calcium fly ash geopolymer cementing material and preparation method thereof. Patent. CN-101857387-A. Inventor. XIAOLU GUO . HUISHENG SHI . Assignee. UNIV TONGJI . Country.
Abstract. Through the purification technology of flue gas desulfurization, ultralow emissions of SO 2 flue gas in industrial flue gas can be achieved. This article …
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 production, property, and applications in the construction industry.
Three batches of desulfurized gypsum with different chloride ion content were used to prepare gypsum . ... Decoration and Decoration Products with Purification Function" (Project No ...
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., …
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 …
Tens of millions of tons of desulfurized gypsum can be produced in China every year. Desulfurization gypsum is used as an admixture to replace part of cement in concrete. And the smaller the particle size of desulfurized gypsum, the better the mechanical properties of cement mortar. The compressive and flexural tests show that the cement mortar with …
After curing the desulfurized gypsum from coal-fired power plants via the chelation method, the group with the best curing effect (i.e., the group with an 8% mass fraction) was selected for the experiment on …
Since many independent factors can affect the property of geopolymer, it is of great significance to seek optimization technologies to maximize the recovery and utilization of solid waste resources.In this work, a cementitious material was prepared using ground granulated blast furnace slag (GGBS), carbide slag (CS) and desulfurized …
Through the purification technology of flue gas desulfurization, ultralow emission of SO2 flue gas in industrial flue gas can be achieved. ... Flue gas desulfurized gypsum (FGD gypsum), mainly ...
The treatment of flue-gas desulfurization (FGD) gypsum, a common solid waste material that is often affected by chloride ions, typically occupies large amounts of land, causes resource waste, and results in …
Association), 1 chloride content in the desulfurized gypsum . ... high temperatures processing and further purification and can . be used in building and design, pharmaceuticals, ceramics,
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 FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another …
Since many independent factors can affect the property of geopolymer, it is of great significance to seek optimization technologies to maximize the recovery and utilization of solid waste resources. In this work, a cementitious material was prepared using ground granulated blast furnace slag (GGBS), carbide slag (CS) and desulfurized …
The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and dehydrated for 2 h under synchronous heating with the box. ... The mineral powder, which was obtained from the Gongyilongze Water Purification Material Co., Ltd., was an off-white powder, with a …
The production of flue gas desulfurization gypsum poses a serious threat to the environment. Thus, utilizing gypsum-based self-leveling mortar (GSLM) stands out …
Lu et al. (2016) used sulfuric acid in a method called "atmospheric acid solution" to decolor gypsum by controlling the crystallization of the gypsum and the …
Liu et al. (2016) studied the effects of desulfurized gypsum particle size, slurry concentration, and additive on CSW morphology. ... When the purification concentration was low, only some impurities on the surface of the crystal generated by oxidation may have been removed, and the introduction of sulfuric acid may lower the …
As an industrial by-product of flue gas desulfurization, flue gas desulfurization gypsum (FGD gypsum), whose main component is CaSO 4 · 2H 2 O, is an ideal raw material for mineralization.
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 …
1. 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 …
FGD gypsum was taken from a steel plant located in Panzhihua, China. The dust-removed sulphur dioxide flue gas passes through a scrubber and reacts with lime-limestone slurry to generate FGD gypsum. The gypsum slurry is filtrated and dehydrated to make into FGD gypsum powder.
The minimum mercury concentration in desulfurized gypsum is 0.17 mg/kg and the maximum concentration in desulfurized gypsum is 0.52 mg/kg. The mean mercury concentration of desulfurized gypsum is 0.33 mg/kg, which exceeds that of coal. The minimum mercury content in desulfurized wastewater is 9.8 μ g/L and the maximum is …
gypsum was divided into deta il, and its comprehensive utili-zation status was analyzed.14) Secondly, some progress has been made in the research of desulfurized gypsum as a waterproofing agent, and a new type of building gypsum-based waterproofing agent has been prepared.15) In addi-tion, a new type of high-efficiency inorganic composite
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 …
Abstract. The thermal instability of most mercury (Hg) species in flue gas desulfurization (FGD) gypsum may lead to the release of large amounts of Hg into the …
Modifying SSFGDA extends its range of application to materials such as desulfurized gypsum used in architecture products and industrial cement retarders [20], [21]. In China, however, ... 2024, Separation and Purification Technology. Show abstract. Electric arc furnace dust (EAFD) is a hazardous waste by-product generated during the …
