Study of the Design and Mechanical Properties of the Mix

Based on the stress–strain relationship test results, a uniaxial compressive constitutive model of the desulfurization gypsum–fly ash flowable lightweight soil was proposed. ... Desulfurized gypsum–fly ash flowable lightweight soil is a high flowable roadbed backfill material made by uniformly mixing Portland cement, fly ash, and ...

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Investigation on the effects of desulfurization gypsum on …

The test results indicated the disadvantage of GGBS-FA binary geopolymer in terms of setting time. That is, the increase in GGBS content increased the strength while reducing the setting time in the GGBS-FA binary system. ... Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road …

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Multi-objective optimization of properties on polymer fiber …

However, desulfurization gypsum was commonly used as a filler or partial reaction material, resulting in a low utilization rate. Therefore, admixtures were added to desulfurization gypsum to prepare desulfurized gypsum-based composites, improving the mechanical characteristics of desulfurization gypsum [8], [9] and increasing its …

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CN112697322B

The invention discloses a method for testing the output of a desulfurized gypsum vacuum belt conveyor, which comprises the following steps: (1) sampling gypsum and testing the size and weight of the gypsum; (2) measuring the running speed of the belt; (3) measuring the width of the dewatered gypsum on the belt; (4) and (4) performing output calculation …

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The mechanism of preparation calcium ferrite from …

AR > 99% was mixed with sintered desulfurized gypsum to test the reaction mechanism. Fig. 5 a and b shows the results of the XRD analysis of the product at different reaction time in an argon atmosphere. It shows that when the reaction time was less than 2 h, the product had high carbon content and a high carbon peak intensity, …

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Experimental study of permeability evolution in modified

Production and resource utilization of flue gas desulfurized gypsum in China - a review. Environ. Pollut. (2021) I. Navarrete et al. ... Therefore, in this paper, with the help of RLJW-2000 testing machine, the uniaxial compression test of C15 strength grade coal-fired slag concrete is carried out, the energy evolution law in the process of ...

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Effect of silane modified styrene-acrylic emulsion on the …

The compressive strength test of desulfurized gypsum was carried out using a fully automatic compressive bending machine (WHY-200, China). (3) Test of softening coefficient: The cured test piece was soaked in clean water of (20 ± 2) °C for 24 h and taken out. The compressive strength of the sample saturated with water was …

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Emission reduction process for dechlorinating …

The treatment of flue-gas desulfurization (FGD) gypsum, a common solid waste material that is often affected by chloride ions, typically occupies large amounts of land, causes resource waste, and results in …

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Optimization design and characterization of slag …

Since many independent factors can affect the property of geopolymer, it is of great significance to seek optimization technologies to maximize the recovery and utilization of solid waste resources.In this work, a cementitious material was prepared using ground granulated blast furnace slag (GGBS), carbide slag (CS) and desulfurized …

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Effects of stabilizers on the properties and …

However, the costs of the test instruments are high ... As the next step, the grinded ITS-AAC slurry is taken out of a part, and was mixed with pre-weighed cement, lime, desulfurized gypsum, and other raw materials in a high-speed mixer for a mixing time of 150 s. After the completion of the mixing, aluminum powder was added, and …

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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 its abundance, chemical and physical properties, FGDG has been used in several …

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Characterization of flue gas desulphurized (FGD) gypsum of …

The leaching test of the HMs present in FGD gypsum samples was done following the US EPA SPLP standard to extract the acid-soluble fraction (USEPA, Method 1312, 1994) and European Standard ...

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Multi-objective optimization of properties on polymer fiber …

1. Introduction. Desulfurization gypsum is an industrial by-product produced in the process of wet desulfurization of coal-fired flue gas [1].The data showed that nearly 100 million tons of desulfurization gypsum were released into the environment each year in China [2].Currently, desulfurization gypsum has been applied to prepare gypsum …

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Effects of hybrid fibers on properties of desulfurized gypsum …

Basalt fiber (BF) and polyvinyl alcohol fiber (PVAF) were mixed into desulfurized gypsum-based composite cementitious material (DGCCM) by an orthogonal test to prepare hybrid fiber-reinforced ...

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Experimental investigation of utilizing waste flue gas desulfurized …

Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another …

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Utilization of flue gas desulfurization gypsum to produce …

Flue gas desulfurized gypsum (FGDG) is an industrial by-product discharged from thermal power plants, smelters, and large-scale enterprise boilers. ... The XRD test procedures are as described in Section 2.1. TGA tests were performed in a Discovery TGA5500 analyzer (TA, USA). The test specimen was heated continuously …

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The effects of desulfurized gypsum on the mechanical …

Geopolymer is an emerging green cementitious material that can be used to stabilize dredged clay (DC) as construction materials. This paper presented an experimental study on the effects of desulfurized gypsum (DG) on the mechanical properties (e.g., stress-strain characteristics, unconfined compressive strength (UCS) and water stability) …

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Study on the influence mechanism of flue gas desulphurisation gypsum …

The mechanical properties, phase composition, and microstructure of the grouting materials were determined using a universal testing machine, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. The results show that flue gas desulphurisation gypsum dried at 120 °C generated more whiskers.

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IC Determination of Calcium Sulfate in Desulfurized Gypsum …

Ion chromatography was applied to the determination of SO42- ion in desulfurized gypsum powder, and content of CaSO4 (in w%) was calculated from the amount of SO42- found. The sample (0.050 0 g) was dissolved with 0.5 mL of HCl (1+1) solution and the solution with the insoluble residue was made up to 100 mL in a volumetric flask. An …

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Solid waste-based dry-mix mortar using fly ash, carbide slag, …

At the same time, the addition of desulfurized gypsum produces ettringite, enhancing the compressive strength of the cemented test block. All these considerations together show that C–S–H is the main factor affecting the compressive strength of both the FA-CS binary-gel-system and FA-CS-FGDG ternary-gel-system test blocks.

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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 …

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Desulfurized Gypsum

China Desulfurized Gypsum wholesale - Select 2024 high quality Desulfurized Gypsum products in best price from certified Chinese Gypsum manufacturers, Gypsum Board suppliers, wholesalers and factory on Made-in-China. ... Test,Selection,Drying Work.,etc. Type: Gypsum Board. Lime Type: Hydrated Lime. Lime Shape: Powder. …

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(PDF) Performance Analysis and Improvement of …

Chloride ion has an important influence on the performance of gypsum board prepared by desulfurization gypsum, especially in wet environment. Therefore, this paper analyzed the influence of...

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Preparation, characterization and application of red mud, …

Gypsum is produced by the desulfurization process, and mainly composed of calcium sulfate dihydrate and some impurities (Fu et al., 2019). As of 2016, China's desulfurized gypsum inventory reached 550 million tons (Wu et al., 2019). Coal gangue is a kind of solid waste discharged in the process of coal mining and coal washing.

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Recent advances in flue gas desulfurization gypsum …

The application of FGDG reduced the water-soluble phosphorus concentrations in soils with greater soil test (P = 0.0002) and lower cation exchange capacity (P = 0.0087). ... (Oriza sativa L.) growth and yield using desulfurized gypsum in the west of Songnen Plain, northeast China. Geoderma, 187–188 (2012), pp. 24-30. …

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Effects of hybrid fibers on properties of desulfurized gypsum …

Basalt fiber (BF) and polyvinyl alcohol fiber (PVAF) were mixed into desulfurized gypsum-based composite cementitious material (DGCCM) by an orthogonal test to prepare hybrid fiber-reinforced DGCCM, whose mechanical properties, water resistance, and durability were studied using visual, range, variance, and microstructure …

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Influence of Early Strength Agent on the Strength and

The test results show that sodium sulfate has a poor improvement effect on the sample due to the presence of desulfurized building gypsum in the composite cementing system, while calcium chloride and calcium formate can effectively promote the hydration of the cement in the composite cementing system, significantly improving the …

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The Effects of Combined Retarders on the Properties of …

Citric acid, sodium gluconate, and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined …

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The Key Application Technology of Desulfurized Gypsum …

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 …

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Effects of hybrid fibers on properties of desulfurized gypsum …

The undisturbed desulfurization gypsum after screening was calcined at 180 °C for 2 h and sealed at room temperature for about 7 d to form semi-hydrated desulfurized gypsum. Fig. 1 shows the microscopic morphology and X-ray diffraction (XRD) diagram of desulfurization gypsum. The quicklime was taken from Yibin …

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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. ... A mobility test mold with an inner diameter of 30 ± 0.1 mm and a height of 50 ± 0.1 mm was placed horizontally in the center of the test board. The slurry prepared …

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(PDF) The Key Application Technology of Desulfurized Gypsum …

The results show that ad ding desulfurized gypsum, ... 1:1.2.The 28days final material strength was 2.0 MPa,which achives the technical specification requirements.Through the test of SEM, XRD and ...

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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. ... Finally, the test samples were cured at room temperature to the corresponding ages for different performance tests. Experiments …

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Influence of Calcined Flue Gas Desulfurization Gypsum and …

At present, the industrial utilization of desulfurized gypsum has become one of the main research directions of scholars. Comprehensive utilization of desulfurized gypsum conforms to the concept of green and low-carbon development. ... The final setting time was recorded as the time until the test needle did not leave a circular impression on ...

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Experimental study on the desulfurized gypsum and steel …

With steel slag and desulfurized gypsum as main raw material,mixed appropriate amount slag and compound addition a little of activator,and based on orthogonal test,we explored the slag dosage,the proportion of the combined admixture activator and the desulfurized gypsum dosage impact on the performance of clinker-free cementing material,such as …

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Production and resource utilization of flue gas desulfurized …

Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the …

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