آخرین محصولات
Applying biochar and flue gas desulfurization gypsum in …
More than two-thirds of the arable land in the Hetao Irrigation District of Inner Mongolia, China, is suffering from various soil salinization and alkalization, which has seriously restricted the local agriculture and animal husbandry economy. Among them, biochar and flue gas desulfurization (FGD) gypsum have been widely used as soil amendments in …
Application of the Industrial Byproduct Gypsum in …
In the building materials, the industrial byproduct gypsum is mainly used in the production of cement retarders, gypsum slats, gypsum bricks, gypsum blocks, etc. In recent years, new gypsum products, such as self-leveling gypsum, α-type high-strength gypsum, ii-type anhydrous gypsum, and calcium sulfate whiskers, have also been …
Solidification and Release Characteristics of Heavy …
Heavy metals in flue gas desulfurization (FGD) gypsum from coal-fired power plants are at risk of releaching during the processes of stockpiling and resource utilization. In this study, the effects of …
Effect of Mineral Admixtures on Physical, Mechanical, and
The GSLM benchmark mix ratio was determined as follows: 94% of desulfurization building gypsum, 6% of cement, 0.638% each of water reducer and …
Effect of different soluble salt ions on deformation of desulfurization …
According to statistics, the annual output of desulfurization gypsum in 2014 was about 75.5 million tons. China's 13th five-year plan puts forward that it is necessary to speed up the recycling of waste resources (Hao et al 2016, Ding et al 2021, Ding et al 2023a, 2023b). Thereforethe desulfurization gypsum has excellent utilization prospects.
Experimental Studies on Decomposing Properties of Desulfurization …
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 ...
Oman retains crown as world's biggest gypsum exporter …
Gypsum shipments from the Sultanate of Oman, currently the world's biggest exporter of the industrial mineral, are projected to grow exponentially over the …
Study on the Improvement Effect of Desulfurization Gypsum …
As the waste of coal-fired power plant, desulphurization gypsum is mainly composed of CaSO 3 and CaSO 4, which can replace Na+ in saline-alkali soil to improve saline-alkali soil.In order to study the effect of different dosage of desulfurization gypsum on the improvement of saline-alkali land, field experiments were carried out in Duiziliang …
Influence of Flue Gas Desulfurization Gypsum on …
Flue-gas desulfurization (FGD) gypsum, a byproduct of coal-fired electrical utility plants, has been shown to effectively reduce phosphorus (P) leaching in many agricultural systems. However, its applications in horticultural production systems have been insufficiently researched resulting in limited industry adoption. To evaluate the …
Environmental risk assessment of industrial byproduct gypsum …
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 …
Preparation of calcium ferrite by flue gas desulfurization gypsum
If these gypsums could be utilized, the situation of merely piling-up and burying of desulfurization gypsum would be changed and great environmental pressure would be alleviated correspondingly [16,17,18,19,20,21,22,23,24,25].Zhang et al. [] discussed the possibility of recycling desulfurization gypsum into calcium ferrite in iron …
Insight into the performance of composite binder with high …
The performance of composite binders with high-volume steel slag (SS), granulated blast furnace slag (GBFS) and desulfurization gypsum (DG) were systematically investigated. The results show that the synergistic effects of high volume (40–60%) of SS with GBFS and less than 15% of DG could perform adequate setting …
REFERENCES
The findings indicate that over time, the mass of the sample initially decreases, experiences a slight increase, and then gradually declines. Simultaneously, the strength and structure of the sample deteriorate rapidly, followed by a partial recovery. ... Flue gas desulfurization gypsum (FGDG), a solid waste material generated by power …
A brief review on flue gas desulfurization gypsum recovery …
The past several years has witnessed great progress in utilization of industrial waste gypsum. Newly developed carbonation technology toward CaCO3 preparation …
Mapping the knowledge domain of microbial desulfurization …
The term "microbial desulfurization" was defined as a search topic, and the time span was from 1984 to 2022, resulting in 817 literature data being collected. To ensure the accuracy and completeness of data, the range of search topics was expanded. ... Dick WA et al (2008) Impact of flue gas desulfurization-calcium sulfite and gypsum on ...
Effect of impure components in flue gas desulfurization (FGD) gypsum …
1. Introduction. Limestone/gypsum wet desulfurization technique has been widely used to remove sulfur oxides from flue gas or other industrial waste gas due to its high desulfurization efficiency and stability [1].It is reported that huge amount of FGD gypsum has generated worldwide, especially in China (80 Mt, 2017) and USA (30 Mt, …
Review of Design, Operating, and Financial Considerations in …
3. Flue Gas Desulfurization Technologies. Flue gas desulfurization is an efficient method for the reduction of the sulfur dioxide emissions. Citation 2 Many processes are available in the market, such as (a) wet scrubbers, (b) spray dry scrubbers, (c) sorbent injection, (d) regenerable processes, and (e) combined SO 2 /NO X removal processes. …
Flue Gas Desulfurization: The State of the Art
in the form of commercial-grade gypsum that could be used for wallboard manufacturing. When salable gyp-sum is not attainable, dry FGD waste is piled (gypsum stacking) or landfilled. The operation of the LSFO pro-cess can be improved when organic acids, such as di-basic acid, are added to the limestone slurry. The use of
Preparation of α-High Strength Gypsum from Flue Gas Desulfurization …
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 …
Desulfurization gypsum carbonation for CO2 sequestration …
Desulfurization gypsum is a kind of solid waste with CaSO 4 ‧2H 2 O as the main component produced in the process of limestone-based flue gas desulfurization. About 100 million tons of desulfurization gypsum was produced every year in China (Wang et al., 2020). On the one hand, it has a high content of Ca 2+ and is suitable for …
Omani gypsum exports near 10 million-tonne mark in 2022
At the same time, production of FGD (Flue Gas Desulphurization) gypsum continues to be stymied by shortfalls in investments of US$13 billion necessary to build …
Advancement of Environmental Sustainability: A …
The by-product of the limestone (lime) – gypsum desulfurization process is gypsum, which can be recycled and reused. This process is technologically mature, with high desulfurization efficiency (90% to 98%), suitable for large-capacity units, adaptable to various types of coal, reliable in performance, and uses absorbents that are abundant ...
(PDF) Study on synthetic gypsum obtained from wet flue gas
Flue gas desulfurization (FGD) gypsum was evaluated as a setting time retarder to replace the natural gypsum in the production of Portland cement (CP II E-32).
Experimental study of permeability evolution in modified
The annual output of desulfurization gypsum in China is more than 120 million tons, and it is increasing at a rate of 15–20% each year (Liu et al., 2021; Jian et al., 2021). Desulfurization gypsum is the second largest solid waste after fly ash. The primary method of disposing desulfurization gypsum is to dump it on land.
Materials | Free Full-Text | Effect of Flue Gas Desulfurization Gypsum
This work aims to investigate the effect of additional flue gas desulfurization gypsum (FGDG) on the properties of calcium sulfoaluminate cement (CSAC) blended with ground granulated blast furnace slag (GGBFS). The hydration rate, setting time, mechanical strength, pore structure and hydration products of the CSAC-GGBFS …
Recent advances in flue gas desulfurization gypsum …
Flue gas desulfurization gypsum (FGDG) is an industrial by-product generated during the flue gas desulfurization process in coal-fired power plants. Due to …
Utilization of Desulfurization Gypsum to Producing SO
However, desulfurization gypsum has some own features as relatively finer solid size (60 μm), high water content (10–15%) and impurity, these have special effect on the utilization. The desulfurization gypsum are widely utilized in cement retarder, building material, embedment and neutralizer or regulator of soil in agriculture [3, 4].
Effect of Mineral Admixtures on Physical, Mechanical, and
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 approach to address the issue. β-hemihydrate gypsum, cement, polycarboxylate superplasticizer, hydroxypropyl methyl cellulose ether (HPMC), retarder, …
Recent advances in flue gas desulfurization gypsum …
1.1. Flue gas desulfurization processes. The flue gas desulfurization (FGD) processes can be separated into two main categories: once-through and regenerable processes, depending on how the sorbent is treated after SO 2 adsorption (Srivastava and Jozewicz, 2001).Once-through, or non-regenerable, processes utilize the sorbent as a …
Effects of continuous application flue-gas …
Effects of continuous application flue-gas desulfurization gypsum and brackish ice on soil chemical properties and maize growth in a saline soil in coastal area of China Jun Tao a,b,c, ... Soil pH in all treatments tended to increase as time increased in the 0–20 and 20–40 cm soil layers in the raised bed. The results of the present study ...
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