Research on optimizing performance of desulfurization-gypsum …
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. ... This phenomenon was caused by the effect of the calcination temperature on the phase change of desulfurized gypsum promoting the removal of crystalline ...
Influence of Calcined Flue Gas Desulfurization Gypsum and …
The calcination-treated FGD gypsum would not influence the type and morphology hydration products of the calcium sulfur aluminate cement ... The decomposition of chemical-bound water of gypsum can occur when the temperature is higher than 120 °C and the two molecular H 2 O can be released ... The desulfurized gypsum also dissolved ...
Preparation of α-High Strength Gypsum from Flue Gas …
Guan Q J, Sun W, Liu R Q, et al. Promotion of Conversion Activity of Flue Gas Desulfurization Gypsum into α-hemihydrate Gypsum by Calcination-hydration Treatment[J].J. Cent. South Univ., 2019, 26(12): 3 213–3 224 Article CAS Google Scholar . Amirthalingam S, Lee S S, Rajendran A K, et al. Addition of Lactoferrin and Substance P in a Chitin/PLGA-CaSC 4 …
Comparative Analysis of Hydration Expansion Performance of Desulfurized …
It is mainly beca use the calcination temperature fo r . ... Using desulfurized gypsum and steel slag as raw material make desulfurized gypsum-steel slag composite gelled material, by adding ...
Effect of desulfurization gypsum on alternating-current …
The main hydrate phase C 4 A 3 S̄ in BSAC has a very fast hydration rate, and most of them complete the release of hydration heat in 2–12 h [20]. The main hydration products of BSAC are ettringite (AFt), monosulfide calcium sulphoaluminate hydrate (AFm) and amorphous aluminum hydroxide (AH 3).These hydration products make the microstructure of cement …
Promotion of conversion activity of flue gas …
gypsum by calcination and hydration to readily complete the transition. The pretreatment deteriorated the crystallinity ... at 100 r/min for 30 min under room temperature. Finally, the gypsum after hydration was filtered and dried at 60 °C to constant weight. 2) Preparation of α-HH in glycerol-water solutions. A mixed solution (240 g) of glycerol
Promotion of conversion activity of flue gas …
Pretreatment of FGD gypsum. First, the gypsum was put into a drying oven and calcined at 100 °C for 5 h. After that, one part of the sample was used for analysis, and the other part was …
Desulfurized gypsum regulates the hydration and hardening …
The result shows that the optimum calcination system was found that the calcination temperature was 1300 °C, and the holding time was 60 mins, and the compressive strength of cement reached 29.3 MPa at 28 d.
Experimental Investigation and Modeling of Sulfoaluminate …
The calcination temperature in the preparation was as low as 1250–1300 °C, and the main mineral phases of the cement clinker were 3CaO·3Al 2 O 3, CaSO 4, ... Production and resource utilization of flue gas desulfurized gypsum in China - A review. Environmental Pollution 2021, 288, 117799.
Influence of the Calcination Temperature of Synthetic Gypsum …
The paper assesses the influence of the calcination temperature of synthetic gypsum binder on the binding properties of innovative gypsum pastes, as well as on masonry and plastering mortars. The calcination process of gypsum binder was carried out at four different temperatures ranging from 170 to 190 °C. The specimens for testing were prepared on the …
How to grind and calcinate desulfurized gypsum
1. Calcination process of desulfurized gypsum (1) Low temperature and slow calcination. Low-temperature slow-speed calcination means that the material stays in the calcination equipment …
Investigation on the compressive strength of desulfurization gypsum …
The ultra-high addition of 20 % desulfurized gypsum is beneficial to improve the strength of DG-based binary cementitious materials with low energy consumption. ... Ordinary Portland cement (OPC) is the most widely used binder material, but the OPC calcination process ... Germany) under nitrogen with a temperature increase rate of 10 ℃ min ...
A brief review on flue gas desulfurization gypsum recovery …
Tan et al. studied the process parameters of direct wet mineralization of CO 2 with desulfurized gypsum and established a reaction model of direct wet mineralization of CO 2 with desulfurized gypsum in an ammonia medium system. 60 ... carbon monoxide gas or hydrogen gas is used as a reductant and mixed with gypsum at high temperature. 100–102 ...
Study on the influence mechanism of flue gas desulphurisation gypsum …
After calcination at 120 °C, the main components of FGDG are CaSO 4 ·2H 2 O and CaSO 4 ·0. 5H 2 O; at this temperature, dihydrate gypsum has started to partially convert into hemihydrate gypsum. After calcination at 200 °C, the main component is CaSO 4 ·0.5H 2 O. After calcination at 220 °C, anhydrous gypsum is the main component of ...
Production and resource utilization of flue gas desulfurized …
At present, due to the high decomposition temperature and complex composition of gypsum, only a small part of FGD gypsum is recycled; most of it is directly stored as solid …
Research on red mud-limestone modified desulfurization mechanism and
It would cause the desulfurized gypsum to have a higher moisture content. After drying, the desulfurized gypsum has strong water absorption, and it is easy to generate H 2 S during the high-temperature calcination process, which …
A comprehensive review of flue gas desulphurized gypsum: …
In 2015, the Ministry of Environment, Forest and Climate Change (MoEF&CC), India, introduced new standards for emission limits for coal power stations (Table 1). ... (α-HH) gypsum using flue gas desulfurized gypsum is essential for the utilization of calcium and sulfur resources. ... gypsum and fly ash (FA), which are byproducts of coal-based ...
Resource utilization of semi-dry flue gas desulfurization ash …
Additionally, it has a more intricate composition than desulfurized gypsum, as the sources of S originate from both CaSO 4 and CaSO 3. ... High-temperature calcination experiments of SFGDA were conducted using a laboratory sintering cup shown in Fig. 3. Download: Download high-res image (236KB) Download: Download full-size image; Fig. 3.
Effects of Different Admixtures on the Mechanical …
The single-factor experiments are designed to quantitatively investigate the effects of silica fume, mineral powder, and fly ash on the mechanical and thermal insulation properties of desulfurization gypsum-based …
Open Access proceedings Journal of Physics: Conference …
Prepared from Desulfurized Gypsum with High Chloride Ion Content Yin Dongjie, Wu Fade, Wang Ying, Wang Pengqi, Tan Danjun, Jian Ming and ... and affect the calcination temperature and quality of desulfurization gypsum. At the same time, high chloride ion content will reduce the bonding ... put it in a constant temperature water bath at 100°C ...
A comprehensive review of flue gas desulphurized gypsum: …
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 …
Dehydration Pathways of Gypsum and the …
The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was also studied …
Desulfurization gypsum rotary dryer calcination …
The high-temperature calcination method (equipment) is that the desulfurized gypsum is in direct contact with the high-temperature flue gas for heat exchange, rapid dehydration and calcination. The heat source temperature of high …
Optimization of mechanical performance of limestone …
DOI: 10.1016/j.conbuildmat.2023.131709 Corpus ID: 258768915; Optimization of mechanical performance of limestone calcined clay cement: Effects of calcination temperature of nanosized tubular halloysite, gypsum content, and water/binder ratio
Study on the influence mechanism of flue gas desulphurisation gypsum …
In the limestone gypsum flue gas desulphurisation process, 2.7 tons of FGDG can be produced for every 1 ton of SO 2 that is removed [2]. Compared with natural gypsum, FGDG has a smaller and more uniform particle size and a larger specific surface area; therefore, FGDG has a certain importance in industry.
WO2018166220A1
The type of desulfurized gypsum is greatly affected by temperature. The desulfurized gypsum loses crystal water from 135 °C, and all the crystal water is removed at 185 °C. ... When the calcination temperature is 1250-1300 °C, 4CaO·2Si 2 O 2 ·CaSO 2 disappears and decomposes into α'-2CaO·SiO 2 and free CaSO 4.
Study on the system of calcined desulfurization gypsum
Mix proportion of complex cementitious system. Note: desulfurization gypsum in the table is desulfurization gypsum calcined at 800 °C; SO3 is calculated according to sulfate content in …
Clay calcination technology: state-of-the-art review by the …
For the production of LC 3, grinding may be used to obtain a uniform and intimate mixture with clinker, limestone, and gypsum [92, 119]. The cement can also be produced by blending components after separate grinding. ... Ferreiro S et al (2019) Influence of fineness of raw clay and calcination temperature on the performance of calcined clay ...
Study on the system of calcined desulfurization gypsum
desulfurization gypsum, so desulfurization gypsum is calcined at 800 ℃ in advance ([2]). The desulfurization gypsum was calcined in the DRY-36 high temperature industrial furnace of Shanghai Kecheng Company. The calcination system was as follows: heating up from room temperature to 800 ℃, and constant temperature for 1h,
Effect of desulfurized gypsum whiskers on the …
of red mud / desulfurized gypsum whiskers mass ratio, coupling agent dosages and calcination temperature on the Pb(II) ... The resulted optimum factor was the mass ratio of red mud / desulfurized gypsum whiskers as 2:1 with silane-coupling agent dosage as 0.1% at 900 °C, and the maximum absorption capacity of Pb ...