The Key Application Technology of Desulfurized Gypsum in …
desulfurized gypsum mortar system has explored the composition of cement, FA, and FGD through experiments [4]. The cement content is initially set at 10%-20% of the cementitious material, and FA is added. The amount is 10% to 60%, and the FGD is 20% to 70%; methyl cellulose ether is blended at 0.1% of the mass of ...
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Influence of Calcined Flue Gas Desulfurization Gypsum and …
To solve the problem of the low early strength of the fly ash-desulfurized gypsum system, this study innovatively uses sulfate to increase its early strength without shrinking late …
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Highly efficient modified phosphogypsum building gypsum …
The stockpiling of phosphogypsum is a waste of land resources and also causes serious pollution to natural resources such as water and atmosphere. This paper explores the mechanism of efficiently modified phosphogypsum and constructs a model and evaluation system for heavy metal leaching and migration transformation. The modified phosphogypsum is used …
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Production and resource utilization of flue gas desulfurized gypsum …
Comparative effect of additives on the mechanical properties of plasters made from flue-gas desulfurized and natural gypsums Materials and Structures, 2002 Comment on "Calcium Bisulfite Oxidation Rate in the Wet Limestone−Gypsum Flue Gas Desulfurization Process"
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High value-added utilization of desulfurized building gypsum …
calcination temperature of β -hemihydrate gypsum is signicantly lower than that of cement, usually within a range of 135–180°C, and it can be fully recycled (Lushnikova and Dvorkin 2016; Krejsova et al. ... In summary, desulfurized gypsum, an industrial by-product produced by ue gas desulfurization process, is the most practical engineering ...
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Calcination
The purpose of calcination is often to remove volatile impurities or convert the material into a more stable, less reactive form. Examples of materials that are commonly subjected to calcination include limestone, gypsum, alumina, and …
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Investigation on the compressive strength of desulfurization …
Calcium sulphate contained in desulphurized gypsum can form a structural film during the hydration process, thus retarding the hydration reaction of the material and …
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CN209428411U
The utility model provides a kind of device for calcining desulfurized gypsum, including calcination kettle body device, agitating device and dehydration device；Wherein, pot body device includes pot body and upper cover；It is provided with feed inlet on upper lid, the junction of pot body and upper cover is additionally provided with discharge port；Agitating device includes stirring ...
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Calcination-free desulfurized gypsum brick
The invention discloses a calcination-free desulfurized gypsum brick, pertaining to the production field of building bricks. The gypsum brick is produced by the following ingredients by weight proportion: 25-35 portions of desulfurized dehydrate gypsum; 10-20 portions of cement, 50-65 portions of aggregate, 0.2-1.5 portions of intensifier and 3-5 portions of solid-phase cementing …
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Production and resource utilization of flue gas desulfurized …
The calcination of FGD gypsum is used as a phosphate adsorption material to treat phosphate wastewater. Roasting improves the adsorption performance of FGD gypsum for …
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Study on the system of calcined desulfurization gypsum
Desulfurization gypsum (Flue gas desulfurization gypsum, FGD gypsum for short) is a by-product of desulfurization in coal-fired plants. Its main component is calcium sulfate …
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Application of Flue Gas Desulfurization Gypsum and Its Impact …
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 ·0.5H 2 O), which is further treated with wet limestone and forced oxidization to form calcium sulfate (CaSO 4 ·2H 2 O) (Laperche and Bigham, 2002).Synthetic …
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Study on improving properties of desulfurized gypsum based …
Two kinds of inorganic reinforcing materials, single Portland cement clinker, compound Portland cement clinker and mineral powder, were used to analyze the effects of desulfurized gypsum on the properties of desulfurized gypsum based cementation material. The results show that either single Portland cement clinker or compound Portland cement clinker and mineral powder can …
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Development and Application of Flue Gas Desulfurized Gypsum …
The purpose of this section is to examine the repairing effect of the developed grouting material on cracked silty mudstone slopes. Numerical simulations based on CDEM were employed due to the large volume and time-consuming nature of field tests and model tests. ... "Development and Application of Flue Gas Desulfurized Gypsum and Blast-Furnace ...
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Performance Analysis and Improvement of Gypsum Board …
Three batches of desulfurized gypsum with different chloride ion content were used to prepare gypsum board. According to JC/T 2074-2011 "Flue Gas Desulfurization Gypsum", the chloride ion contents in
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Utilization of Desulfurization Gypsum to Producing SO
The system diagram of reducing gypsum in the multi- stage and multi-atmosphere fluidized beds. Diagrammatize: 1 raw material; 2 pelleter; 3 adhesion material; 4 drying process; 5 circulating fluidized bed heater; 6 cyclone separator; 7 J type valve; 8 circulating fluidized bed reactor; 9 tubular air preheater; 10 dust collector; 11 draft fan; 12 chimney; 13 air; 14 fell cloud …
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The fineness of desulfurisation gypsum affects the performance of
Desulfurisation gypsum is an industrial by-product obtained from the desulfurisation and purification of coal-fired flue gas. It is produced by grinding quicklime or limestone and reacting it with sulphur dioxide in the flue gas to form calcium sulfate dihydrate with fine particles, high water content and a large specific gravity. Its fineness generally ranges …
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Desulfurization gypsum rotary dryer calcination process
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 …
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gypsum as self-leveling mortar: the comprehensive High …
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 ...
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A comprehensive review of flue gas desulphurized gypsum: …
The purpose of the research was to conduct a scientometric evaluation of a literature review on FGD gypsum to assess its potential as a sustainable building material. ... FGD Gypsum: TS = FGD GYPSUM: 2010–01-01 to 2023–05-08: 581: SCI-EXPANDED, SSCI, CPCI-S ... 55.67: 11.14: 18.01, calcination at about 1300 °C: Highest compressive strength ...
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Optimization of mechanical performance of limestone calcined …
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
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CN109279794A
The present invention relates to desulfurized gypsum steam calcination kiln technical fields, and disclose a kind of desulfurized gypsum steam calcination kiln of two sections of kiln hood rotations docking, the upper surface on ground is fixedly installed with fixed column, the upper surface of fixed column is fixedly installed with retainer plate, the inner sidewall of retainer plate is ...
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Potential of desulfurized gypsum as a sulfate alternative in …
Semantic Scholar extracted view of "Potential of desulfurized gypsum as a sulfate alternative in preparing solid waste-based limestone calcined clay cement (LC3) and its effects on early properties" by Peng Yi et al. ... Effects of calcination temperature of nanosized tubular halloysite, gypsum content, and water/binder ratio.
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CN110304852A
The present invention relates to a kind of method that desulfurized gypsum brightens and obtained gypsum and purposes.The method that the desulfurized gypsum brightens includes the following steps: (1) by desulphurization gypsum calcination；(2) it will be mixed containing calcined desulfurized gypsum alkaline solution with bleaching agent, and obtain pre …
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A comprehensive review of flue gas desulphurized gypsum: …
FGD gypsum was subjected to calcination, resulting in the formation of β-hemihydrate plaster. Various trial mixes of binders were then formulated, incorporating different proportions of β ...
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Effect of Industrial Byproduct Gypsum on the Mechanical …
The presence of chloride ions in desulfurized gypsum, iron, and magnesium ions in TG, as well as soluble phosphorus and fluoride in ... (CSA) is a cementitious material formed through the low-temperature calcination of raw materials such as limestone and gypsum, and it consists mainly of anhydrous calcium sulfoaluminate (C 4 A 3 S) and ...
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Effect of desulfurized gypsum whiskers on the adsorption …
In order to realize the reutilization of industrial waste red mud and desulfurized gypsum whiskers, a novel ceramsite was fabricated using red mud and desulfurized gypsum whiskers for the adsorption of Pb(II). The study investigated the impact of red mud / desulfurized gypsum whiskers mass ratio, coupling agent dosages and calcination temperature on the …
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Desulfurized gypsum regulates the hydration and hardening …
The purpose of this study is to investigate the feasibility of an innovative concept of producing the CSA cement based on sulfur recovery and entirely made of the FGD gypsum to replace natural ...
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Potential of desulfurized gypsum as a sulfate alternative in …
Desulfurized gypsum (DG) presents significant challenges in recycling with the rapid development of industrialization. To explore the feasibility of DG as a sulfate source in producing limestone calcined clay cement (LC3), this study investigates the differences between LC3 samples containing DG and those containing natural gypsum (NG) in terms of hydration, …
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Effect of desulfurization gypsum on alternating-current impedance
Its main components are dihydrate gypsum and hemihydrate gypsum, which have good solubility and are similar to natural gypsum [29], [30]. There are few reports on the effect of different contents of desulfurization gypsum on the formation rate of ettringite. The role of desulfurization gypsum in BSAC hydration remains to be further studied.
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