2.1. Raw materials. The desulfurized β-hemihydrate gypsum (density; 2.497 g/cm 3 and specific surface area; 330.14 kg/m 2) was obtained from Chongqing Yuju Environmental Protection Technology Co., LTD.The 42.5R Ordinary Portland Cement (similar to ASTM C150 Type I Cement) was obtained from Chongqing Fuhuang Cement Co., LTD …
قرأ أكثر
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 …
قرأ أكثر
when the amount of cement is 18%, the softening coefficient of desulfurized building gypsum is 0.71, and the water resistance is better[5]. Research by Butakova et al. found that adding a certain amount of cement and silica fume into gypsum can improve its water resistance, and the softening coefficient has been increased from 0.33 to 0.50[6].
قرأ أكثر
Add to Mendeley. Share. ... crystal structure, particle size, and moisture content. It also reviews the various applications of FGD gypsum, such as in cement and concrete production, agriculture, and gypsum board manufacturing. In the construction industry, FGD gypsum is widely used as a raw material for producing gypsum …
قرأ أكثر
The main objective of this study is to investigate the effect of the mechanical properties and microstructure of magnesium sulfide oxide cement (MOSC) by adding …
قرأ أكثر
The paper discusses the chemical and physical properties of FGD gypsum, including its composition, crystal structure, particle size, and moisture content. It also reviews the various applications of FGD gypsum, such as in cement and concrete …
قرأ أكثر
Using Portland cement for soil solidification has sustainability issues due to high energy-consumption and carbon emissions.An innovative approach suggests using titanium slag and flue gas desulfurized gypsum as substitutes for Portland cement for soil solidification. This study systematically evaluates the effects of titanium slag-flue gas …
قرأ أكثر
The above research shows that the application of desulfurized gypsum in concrete systems will help improve the overall performance of concrete, realize the industrial utilization of desulfurized gypsum, and turn desulfurized gypsum into treasure, which is in line with the green and low-carbon development concept. However, adding …
قرأ أكثر
F lue gas desulfurization gypsum (FGDG) is a synthetic gypsum that is created during the removal of SO 2 from flue gas by reacting the SO 2 with calcite (CaCO 3) to form calcium sulfite (CaSO 3 …
قرأ أكثر
Add to Mendeley. Share. ... It also reviews the various applications of FGD gypsum, such as in cement and concrete production, agriculture, and gypsum board manufacturing. 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 …
قرأ أكثر
Cement clinker minerals, mineral powder, and active calcium aluminate were dissolved in water to produce Al(OH) 4− and OH − after water was added to the Portland cement-fly ash-calcined FGD gypsum-calcium aluminate composite quaternary cementitious system. The desulfurized gypsum also dissolved SO 4 2− and Ca 2+ …
قرأ أكثر
The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water. The process involved in hydration of cement is that, when the water is added into …
قرأ أكثر
DOI: 10.1016/j.conbuildmat.2023.131840 Corpus ID: 258997305; Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials @article{Lv2023EffectsOH, title={Effects of hybrid fibers on properties of desulfurized gypsum-based composite cementitious materials}, author={Fangtao Lv …
قرأ أكثر
In the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO 2 removed . A 300 MW coal-fired thermal power unit discharges about 30,000 ton of desulfurized gypsum every year (assuming 1.0% sulfur in coal) . A substantial amount of desulfurized gypsum is …
قرأ أكثر
The process control is fully computerized and handled by highly qualified and experienced personnel. The total current production capacity of Oman Cement Company is 2.4 million MTs Cement. Oman Cement has a …
قرأ أكثر
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 …
قرأ أكثر
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 …
قرأ أكثر
the super-sulfated cement (SSC). The alkali sulfate activa-tors were Type I Portland cement complied with ASTM C150 and the industrial solid waste of ue gas desulfuriza-tion gypsum (FDG) available in Taiwan, respectively. To improve the properties of SSCs with untreated FDG, the pretreated FDGs with dierent thermal preheating regimes
قرأ أكثر
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 …
قرأ أكثر
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 sel …
قرأ أكثر
The massive deposition of sediment in the Yellow River leads to the waste of land resources and is also prone to environmental disasters. In this study, the industrial by-product, flue gas desulfurization gypsum (FGDG), was incorporated with Portland cement (PC) and fly ash (FA) to treat the dredged soil (DS) from the Yellow River. The …
قرأ أكثر
The results show that adding 1% porous mineral material to the desulfurization gypsum with higher chloride ion content can improve the wet-thermal bonding properties obviously, and has little ...
قرأ أكثر
Flue gas desulfurization gypsum (FGDG) is a coal combustion by-product that can be used in various beneficial ways. This review summarizes the recent …
قرأ أكثر
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 …
قرأ أكثر
Research has found that adding 5–10% of desulfurized gypsum can enhance the strength of geopolymers. ... desulfurized gypsum, cement clinker, and slag as the cementitious composite. Table 4 describes the test protocol, where a total of 27 groups were set up. The cement–mortar ratio was 1:4 and the slurry concentration was …
قرأ أكثر
Therefore, it is of great significance to control the use of cement in engineering, and the development of green binder using industrial wastes and by-products for DS solidification is very promising. Flue gas desulfurized gypsum (FGDG) is an industrial by-product discharged from thermal power plants, smelters, and large-scale …
قرأ أكثر
This article comparatively studied and explained the effect of different types of waste gypsum on the properties of alkali slag cement and pointed out that the change in the microstructure of hardened …
قرأ أكثر
The desulfurized gypsum treated with hydrogen peroxide can improve the stability of cement. When the proportion of desulfurized gypsum and natural gypsum is …
قرأ أكثر
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.
قرأ أكثر
In the limestone gypsum flue gas desulfurization process, 2.7 ton of desulfurized gypsum can be generated for each 1 ton of SO 2 removed . A 300 MW coal-fired thermal power unit discharges about …
قرأ أكثر
Our product range covers pre-blended dry mix products based on Cement and Gypsum. Why Oman Plaster "Oman Plaster (OP) products are designed and manufactured meeting the specification of BS/EN/DIN/ASTM standards. Our most modern state-of-the-art manufacturing facility and stringent quality control measures will ensure the superior …
قرأ أكثر
Prior to its use in cement, FGD gypsum needs to be dehydrated. 109 According to these studies, the results showed that (a) as the heat treatment temperature increased, the concrete setting time decreased and (b) cement produced with FGD gypsum calcined at 200°C and showed a maximum strength at a 3.5% SO 3 content.
قرأ أكثر
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 improve the ... It can be seen that after adding cement, the volume density of the freshly mixed desulfurized gypsum-based mortar has increased [7]. The ...
قرأ أكثر
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 …
قرأ أكثر
Concrete/cement and asphalt production. Natural gypsum can be used in concrete production as a replacement for calcium aluminate cement (CAC), opening the possibility of replacing the natural gypsum with FGDG in this application with success, even though some studies have reported a reduction of compressive strength and water …
قرأ أكثر