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Results showed that FGD gypsum can be used as a substitute for cement as a setting retarder in an amount of up to 25%, and as an accelerator in an amount of 75%, being necessary dosage of the ...
At present, the continuous accumulation of the flue gas desulfurization (FGD) gypsum in steel plants leads to the serious environmental issues and resource waste. To achieve green and sustainable development for the steel industry, it is significant to improve the usage of by-product gypsum. Employing the sintering FGD gypsum, …
Desulfurization gypsum, the byproduct from wet flue gas desulfurization, and red mud, from the production of aluminum oxide, are two bulk industrial solid wastes that trigger many local environmental problems in China. This study aims to jointly utilize them. Through experimentation and modeling using FactSage, it has been found to be …
Current study proposes an effective way to modify the properties of super-sulfated cement (SSC) paste and mortar with preheated flue gas desulfurization (FDG) …
The synthesis of α-calcium sulfate hemihydrate (α-CSH) from flue gas desulfurization (FGD) gypsum is a good way to realize the comprehensive utilization of FGD gypsum. To obtain α-CSH with the satisfactory performances, a facile hydrothermal-aging pretreatment process for FGD gypsum raw materials was proposed, where FGD …
In the construction industry, FGD gypsum is widely used as a raw material for producing gypsum products, such as plasterboard and cement, due to its high purity and low cost.
The results showed that the use of flue gas desulfurization gypsum could increase the compressive strength with a substitution percentage of 5% with an optimum average compressive strength value of 8,569 MPa and the optimum water absorption value with a 5% substitution percentage of 9,315%. ... The U.S. Cement Industry - A Case …
In addition, the price of S95 GBFS used in the cement and concrete industry is already close to the price of cement, and the price of S105 GBFS even exceeds the price of cement. In Chinese standard, broadly defined as when GBFS is mixed with cement in a 1/1 ratio, the compressive strength can reach at least 95% of pure cement in 28 days ...
Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. Due to …
The utilization of citro- and desulphogypsum in the cement industry as set retarders was tested and compared with natural gypsum. ... To use flue gas desulfurization (FGD) gypsum and limestone as ...
The cement industry is facing numerous challenges in the 21st century due to depleting natural fuel resources, shortage of raw materials, exponentially increasing cement demand and climate linked …
Flue gas desulfurization gypsum is used to add to magnesium oxysulfate cement. • The macro and micro effects of the flue gas desulfurization gypsum admixture and curing temperature on magnesium oxysulfate cement was discussed. • Under 40 °C curing, MOSC exhibited an increase in strength as well as a significant improvement in …
In terms of building materials, FGD gypsum is mainly used in replacing cement clinker, while in agricultural and soil application, FGD gypsum is mainly used …
One new flue gas desulfurization (FGD) gypsum-based binder is attempted in this article, which is made up of FGD gypsum, ground granulated blast furnace slag …
In the construction industry, FGD gypsum is widely used as a raw material for producing gypsum products, such as plasterboard and cement, due to its high purity and low cost.
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), …
Flue gas desulfurization (FGD) gypsum is an industrial by-product of the desulfurization process. The gross product of FGD gypsum has reached 550 million tons in China by 2016 and quite a portion ...
Global statistics showed in 1998 that wet limestone desulfurization was the main technology used in flue gas desulfurization in power plants, accounting for 83% of flue gas desulfurization systems [89]. The limestone-gypsum wet desulfurization system mainly involves the absorption section and the oxidation section.
With emission control becomes more and more stringent, flue gas desulphurization (FGD) is commonly employed for desulfurization. However, the …
The production of flue gas desulfurization gypsum poses a serious threat to the environment. Thus, utilizing gypsum-based self-leveling mortar (GSLM) stands out as a promising and effective …
The main utilization method of FGD gypsum is still used in construction materials (Ye et al., 2019). As an auxiliary material or instead of natural gypsum, it can be widely used in concrete, walls, concrete, etc. It is the best way to use desulfurized gypsum in large quantities, but its economic value is relatively low (Pedreno-Rojas et al., 2020).
Flue gas desulfurization gypsum (FGDG) is a by-product generated in the combustion of coal. This solid residue has the potential to be applied to the soil and help to reduce acidity and provide nutrients to soils impacted by surface coal mining. Thus, the objective of this work was to evaluate nutrients and heavy metals in soil and plant tissue …
The desulfurization gypsum finds its use in into glass making, water treatment, cement production, mining applications, highway construction, gypsum panel products, and agriculture applications. The rising demand for desulphurization gypsum in the agriculture and construction industry to fuel market growth.
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 …
The industrial CSA clinker used in this study were supplied by Beijixiong Special Cement Co. (China). The chemical compositions of the samples were analyzed by X-ray fluorescence (XRF) after fusing with a mix of Li 2 B 4 O 7 and LiBO 4 at 1050 °C. The measuring device was a micro-XRF system (ORBIS PC by EDAX-AMETEK) equipped …
Gypsum binder, which is the main binder used in these materials, can be obtained by the calcination of calcium sulfate dihydrate mined from natural deposits or …
The preparation of blends with natural gypsum and subsequent use in cement industry for cement set controlling admixture seems to be the suitable method for chemical gypsum utilization. It should be emphasized that some impurities can provoke false setting (alkalis from sodagypsum) [l] or retard the hydration of cement (citrogypsum).
Flue gas desulfurization (FGD) gypsum is mainly generated from wet scrubbing processes, using limestone as a source of ... significantactivity in the cement industry. However, the large
The GSLM benchmark mix ratio was determined as follows: 94% of desulfurization building gypsum, 6% of cement, 0.638% each of water reducer and retarder, 0.085% each of HPMC and deer ...
Wansom et al. replaced natural gypsum in the cement industry by modified CDA from power plant in Thailand. It was found that the disadvantages of unmodified CDA for structural materials were mainly low compressive strength and weak water solubility. ... Therefore, people have started to use flue gas desulfurization …