Desulfurization Gypsum Production Cement Auxiliary Material

Effect of desulfurization gypsum on alternating-current impedance characteristics of all-solid-waste belite sulphoaluminate cement mortar ... Cement-based materials are widely used in artificial composites due to their reliable mechanical performance and lower production costs, and the per capita consumption of cement exceeds 2.5 tons per year ...

Desulfurization-gypsum-based composite cementitious materials were prepared by adding certain proportions of sulfoaluminate cement, mineral powder quick lime, retarder, and water reducer into the original desulfurization gypsum and semi-hydrated desulfurization gypsum. Based on the Box–Behnken design of the response surface methodology (RSM), regression …

The retarding effect of CaSO3-0.5H2O in cement is of great importance to if semidry desulfurization ash can replace gypsum in the utilization of cement.The aim of this paper was to inquire the ...

The extensive accumulation of phosphorus slag (PS) not only occupies land but also pollutes the environment. In the present study, calcium carbide slag (CS) and desulfurization gypsum (DG) were used to synergistically activate PS, and metakaolin (MK) was added to provide additional Al 2 O 3 for the cementitious system. The setting time, pH development, …

The utility model relates to the technical field of cement production, in particular to a matching and proportioning device of desulfurized gypsum and fluorgypsum for improving cement performance. The technical scheme comprises the following steps: operation platform and hopper, the conveyer belt is installed near the front surface middle in the operation platform top, the operation …

The amount of desulfurization gypsum was variable, and the amount of desulfurization gypsum was 0 %, 5 %, 10 %, 15 %, and 20 % of the total amount of cementitious materials. According to "Sulphoaluminate Cement" (GB 20472–2006) [47], the cement-sand ratio was 1:3, and the water-binder ratio was 0.47.

2.2. Test Design. In order to study the flexural strength and compressive strength of slag–desulfurization gypsum-based alkali-activated materials, six factors were selected as the main influencing factors, including desulfurization gypsum, Ca(OH) 2, fly ash, the water–glue ratio, and the content and modulus of the alkaline activator.This study used the orthogonal …

Effects of flue gas desulfurization gypsum incorporation and curing temperatures on magnesium oxysulfate cement. ... MOSC is less polluting to the environment and less energy consuming for production [9], ... 18 %, 22 %, 25 % and 28 % of the total mass of cementitious material mixed into cement, and the water/solid ratio was taken as 0.4, ...

Desulfurization gypsum was taken from a power plant in Hohhot, Inner Mongolia, China. The main chemical compositions of the raw materials, analysed by XRF, are shown in Table 2. It is evident that coal gangue primarily consists of SiO 2 and Al 2 O 3. Carbide slag exhibits a high content of CaO while desulfurization gypsum mainly contains CaO ...

The latest literature reviews [[30], [31], [32]] have previously provided a comprehensive overview of the state-of-the art based on the utilization of gypsum resources, including PG and FGDG, in various cementitious materials including cement, plaster and bricks.Moreover, the performance of PG and FGDG in cementitious materials has demonstrated different results depending on the …

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].

of gypsum as feed material for the production of portland cement. In addition, FGD material has been used in flowable fill in mine recla- mation and in aerated concrete blocks ( 5, 6 ).

Approximately 30 percent of the FGD material produced in 2006 was beneficially used (ACAA 2007). Fixated or stabilized calcium sulfite FGD scrubber material has been used as an embankment and road base material. FGD products have also been used in place of gypsum, as feed material for the production of Portland cement.

The industrial byproduct gypsum is a general term for byproducts discharged from industrial production with calcium sulfate as the main ingredient. Due to the high number of …

For instance, it can be employed as a replacement for traditional natural gypsum in Portland cement (Chandara et al., 2009) or raw materials to sinter CSA clinkers (Ma et al., 2013, Telesca et al., 2013, Wang et al., 2013), but the utilization of FGD gypsum for later mixing procedure of CSA cement was rarely explored to date (Ioannou et al ...

The raw materials utilized for cement clinker synthesis included coal gangue, carbide slag, and desulfurization gypsum. Coal gangue was sourced from Inner Mongolia Yitai Coal Co., Ltd. Carbide slag was obtained from a chemical plant in Erdos, Inner Mongolia, China. Desulfurization gypsum was taken from a power plant in Hohhot, Inner Mongolia ...

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, and deer were …

Approximately 75% of this production is used in cement and concrete production and agriculture, mostly for the Materials 2024, 17, 3774 2 of 14 manufacture of gypsum boards [3]. Traditionally, FGD ...

In recent years, researchers have conducted a variety of research on the bulk consumption of desulfurization gypsum. For example, the desulfurization gypsum was used to produce calcium sulphoaluminate cement [5].Desulfurization gypsum was used as concrete activators [6], cement gel materials [7], and raw materials for waterproof blocks [8] according …

In this paper, desulfurization gypsum (DG) and fly ash (FA) are used as the main raw materials, supplemented by a small amount of Portland cement (PC), to develop a low-cost, fast-setting, and ...

Modification mechanism of flue gas desulfurization gypsum on fly ash and ground granulated blast-furnace slag alkali-activated materials: Promoting green cementitious material ... The related research has reported that about 0.66 to 0.82 kg of carbon emission can be generated during the production of 1 kg of ... in which the by-product waste ...

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).

Mechanical grinding has been widely used in the pretreatment of FGD gypsum to address the flaws mentioned above in the cement industry and has been indicate to be a practical and straightforward approach to improving particle size distribution and reactivity [22], [23], [24], [25].However, FGD gypsum invariably needs to be predried since its free water content …

A new production technique for manufacturing cement and sulphuric acid by using phosphogypsum is to combine the calcination process of nodulized phosphogypsum in hollow kiln with the advantages of vertical cylinder preheating kiln and off-kiln decomposition kiln and to increase the nodulizing system and nodule dryer. The said new technique may increase the …

Fortunately, flue gas desulfurization gypsum (FGDG), a by-product obtained from the desulfurization of coal-fired flue gas, supplies a potential resource of gypsum . The chemical composition of FGDG is similar to that of natural gypsum, and the content of calcium sulfate dihydrate ( C S ¯ ⋅ H 2 ) is usually more than 90%, which also contains ...

How to make high value use of solid waste is a key issue in achieving sustainable development. In this study, a modified magnesium slag-based cementitious material (M·C) for mine filling was developed using industrial solid waste modified magnesium slag (MMS), fly ash (FA), and desulfurization gypsum (DG); the mechanical properties, stability, hydration heat and …

Investigations regarding the preparation and durability of cement-based materials applied in specific coastal acid rain environments are scarce, particularly those involving the addition of four auxiliary cementitious materials (ACMs) to cement for modification. To improve the durability of concrete structures in coastal acid rain areas, a systematic study was conducted …

According to the output industry and species, the industrial byproduct gypsum mainly includes desulfurization gypsum, phosphogypsum, titanium gypsum, citrate gypsum, fluorogypsum, and …

Desulfurized gypsum is an industrial by-product gypsum obtained after flue gas desulfurization in coal-fired or oil-fired power plants [1]. Its main components and physical and chemical …