Reaction formula for processing desulfurized gypsum

The Key Application Technology of Desulfurized …

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 ...

Performance Analysis and Improvement of Gypsum Board …

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Solidification and Release Characteristics of Heavy Metals in Gypsum …

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 organosulfur chelators dithiocarbamate (DTC) and trisodium trithiocyanate-15 (TMT-15) on the solidification characteristics of heavy metals …

Effect of curing temperature on the reaction kinetics of …

DOI: 10.1016/j.jobe.2022.105368 Corpus ID: 252750931; Effect of curing temperature on the reaction kinetics of cementitious steel slag-fly ash-desulfurized gypsum composites system

Application of Flue Gas Desulfurization Gypsum …

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· …

Coatings | Free Full-Text | Study on the Micro Mechanism of …

To investigate the macroscopic mechanical properties and failure evolution mechanism of desulfurization gypsum–fly ash fluid lightweight soil, a microscale numerical model using PFC2D (Particle Flow Code) was constructed. Uniaxial compression tests were conducted to determine the microscopic parameters of the model, extracting information …

The mechanism of preparation calcium ferrite from …

For the decomposition process of gypsum and the reaction process of calcium ferrite formation, ... is defined by the weight change during heat treatment, as described in the following equation (Higuchi et al., 2016): (15) ... the thermodynamically restricted part of the reaction was desulfurized by gypsum decomposition. A powder …

Gas Desulfurization Gypsum-Based Polymer Materials

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 …

Emission reduction process for dechlorinating flue‐gas …

ical formula is CaSO 4·2H 2O, and pure gypsum is white in color. However, gypsum typically contains impurities, Received: 23 September 2019 | Revised: 9 February 2020 | Accepted: 10 February 2020 DOI: 10.1002/ese3.666 PERSPECTIVES Emission reduction process for dechlorinating flue-gas desulfurization gypsum and reducing wastewater …

Insights into Coproduction of Silica Gel via …

most widely used and mature standard desulfurization process technology worldwide. It is the basic process for ﬂue gas ... desulfurized gypsum slurry is recovered after being dehydrated by a dehydration device. When limestoneisusedasthe absorbent,SO 2 isconvertedin the absorption tower, and the reaction equation is as follows CaCO …

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 comprehensive review of flue gas desulphurized (FGD) gypsum …

Effect of curing temperature on the reaction kinetics of …

Solid waste-based binders have been widely studied for decades. Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains unclear.

Utilization of Desulfurization Gypsum to Producing SO

This paper proposed the new technical process to produce SO 2 and CaO by reducing the gypsum in multi-stage fluidized bed reactor with different atmosphere. In …

Production and resource utilization of flue gas desulfurized …

Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced …

Experimental Study on Desulfurized Gypsum Modified …

The influences of desulfurization gypsum on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study.

High value-added utilization of desulfurized building gypsum …

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 …

Improvement in Water Resistance of Desulfurized …

Ltd.); Desulfurization gypsum (Huainan Thermal Power Plant). The content of -hemihydrate gypsum and dihydrate gypsum are 71.4% and 14.7%, respectively. Meanwhile, the chemical composition and phase XRD spectrum of the desulfurized gypsum are shown in Table 1 and Fig. 1, respectively; the TG-DSC analysis curve is shown in Fig. 2;

Gas Desulfurization Gypsum-Based Polymer Materials

Recent advances in flue gas desulfurization gypsum …

The produced calcium sulfite (CaSO 3 ·2H 2 O) is then oxidized, resulting in FGDG. CaSO 3 ·2H 2 O (aq) + ½O 2 (g) ↔CaSO 4 ·2H 2 O (s) Natural oxidation …

Fine Particle Transformation during the Limestone Gypsum

In an attempt to figure out the transformation of fine particles during the limestone gypsum desulfurization, the physical properties of fine particles before and after the desulfurization system were measured in a power plant. ... Improving the removal of fine particulate matter based on heterogeneous condensation in desulfurized flue gas ...

Dehydration Pathways of Gypsum and the Rehydration

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 by Monte Carlo (MC) simulations. The thermodynamic calculation results reveal that the dehydration mechanism of gypsum …

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, …

Carbonation of gypsum from wet flue gas desulfurization process …

In this paper, waste gypsum from wet flue gas desulfurization (WFGD) mixed with NH 3 ·H 2 O was applied for CO 2 absorption in the solid-liquid-gas phase system. The effects of operation temperature, CO 2 flow rates, and ammonia-to-gypsum ratio on carbonation process were discussed. Meanwhile, a model for CO 2 absorption …

Production of SO2 Gas: New and Efficient Utilization of Flue …

To effectively solve the problem of recovery and utilization of flue gas desulfurized gypsum (FGDG), a new method for preparing SO2 gas by adding a mixture of FGDG and pyrite into a boiling furnace and utilizing its high-temperature waste heat is proposed. Using the FactSage 6.1 Reaction module and the Equilib module, the …

CN112358266A

The invention discloses a formula and a process for comprehensively recycling desulfurized gypsum, wherein the desulfurized gypsum, other solid waste materials or natural sandstone materials, cement, a special coagulant and water are used, wherein the mass ratio of the desulfurized gypsum is 70%, the mass ratio of the other solid waste …

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 …

Summary of research progress on industrial flue gas desulfurization

The reaction rate of SO 2 adsorption with calcium based particles is determined using the following steps. (1) SO 2 diffuses to the outer layer of the adsorbent (single particle). (2) SO 2 diffuses to the reaction nucleus through the porous layer of the particles. (3) SO 2 is adsorbed on the reaction layer. (4) SO 2 reacts with calcium to …

Production and resource utilization of flue gas desulfurized gypsum …

Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. ... 2 School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, …

Flue gas desulfurization gypsum: Study of basic mechanical, …

Calcined gypsum as a low-energy material can be produced with advantage from the waste FGD gypsum by its dehydration at the temperatures of 110–150 °C. Then, β-form of calcined gypsum is formed according to the equation (1) CaSO 4 · 2 H 2 O → CaSO 4 · 1 / 2 H 2 O + 1 1 / 2 H 2 O.