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The results indicated that desulfurized gypsum can promote hydration and improve the mechanical strength of SAC with ground granulated blast furnace slag; however, the dosage of desulfurized gypsum should not exceed 6%.
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Desulfurized gypsum and phosphogypsum are the two most used types of industrial by-product gypsum, and they are also the most common. Desulfurization gypsum is a substance with calcium sulfate as the main component obtained by forced oxidation reaction after the countercurrent mass transfer of flue gas and desulfurizer slurry in the desulfurization …
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Dicarboxylic acid modifiers play a crucial role in the controlled synthesis of α-hemihydrate gypsum (α-HH) with an aspect ratio (AR) close to 1 from flue gas desulfurized (FGD) gypsum. However, the effect of dicarboxylic acid modifiers in the preparation of α-HH by FGD …
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The semi-hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board, wallboard [107]. The modified treatment of desulfurized gypsum with cement, inorganic waste, straw fiber and other wastes can be used to manufacture high-insulation and compression-resistant wall materials [108] .
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A method for co-producing sulphoaluminate cement and sulfur by using desulfurized gypsum and aluminum ash, comprising: (1) drying aluminum ash, and heating desulfurized gypsum for dehydration to obtain semi-hydrated gypsum; (2) mixing the aluminum ash with the semi-hydrated gypsum according to a preset ratio, pulverizing, and homogenizing; (3) calcining the pulverized …
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The removal of high concentration flue gas sulfur dioxide (SO2) using manganese carbonate ore desulfurization (MCO-FGD) is a promising route that combines economic benefits and pollution control.
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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 combination of FGD gypsum and slag powder provides synergistic benefits above that of slag powder alone.
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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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The higher the classifier frequency is, the finer the gypsum powder obtained. When the FGD gypsum was subjected to the jet mill with a 45 Hz classifier frequency, the D 50 of the final FGD gypsum powder decreased from 33.810 to 2.667 µm, while the D 50 of normal mechanical ball milled FGD gypsum powder is in the range of 6–10 µm [45], [46 ...
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The evolution of the morphology is determined by the preferential adsorption of the modifier on different surfaces of the α-HH gypsum crystals. These results and fundamental understanding should provide useful information for improving the synthesis of α-HH gypsum using flue gas desulfurized gypsum.
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A reaction system and a method for resource utilization of desulfurized gypsum are disclosed, wherein the reaction system comprises: a supply unit for supplying carbon monoxide; the reaction unit is connected with the supply unit and is used for accommodating desulfurized gypsum to be treated, receiving carbon monoxide from the supply unit and providing the temperature …
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Yang et al. studied the use of steel slag powder, slag powder, desulfurized gypsum, incinerator fly ash, and tail sand in backfilling. They determined that a mix with 15% incinerator fly ash, 4% steel slag powder, 14% desulfurized gypsum, and 67% slag powder met the flowability needs for self-leveling backfill and achieved a 28-day compressive ...
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The utility model provides a dust-raising-preventing and dust-removing device for desulfurized gypsum powder, which comprises a liquid guide shell, a spray plate, a stainless steel pore filter screen plate, a blocking plate, a dust-removing filter bag and a dust filter core, wherein the liquid guide shell is arranged on the upper side inside a spray box, the spray plate is arranged on the ...
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Under normal conditions, gypsum is generally safe for construction, agriculture, and consumer products. However, occupational exposure to gypsum dust —particularly in …
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Dongding Gypsum Dryer Advantages 1. The chemical gypsum (desulfurized gypsum, phosphogypsum, etc.) can be directly fried into β - hemihydrate gypsum powder; 2. Precise control of the drying time and temperature are ensured; 3. Reasonable design of the air outlet, no dust pollution; 4.Multiple heating source choices.Tailored solutions for each ...
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The invention discloses a preparation method of ultra-high strength gypsum powder by using desulfurized gypsum for constant pressurization, which specifically comprises the following steps: s1, screening and washing; s2, pulping and inducing; s3, constant-pressure crystal transformation; s4, centrifugal dehydration; s5, drying the frying pan; and S6, grading modification.
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Polymeric amino acid retarder (bulk density 640 ± 50 g/L, fineness ≤ 300 μm) can prolong the hydration time of desulfurization gypsum, and deer powder polyether (pH …
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A technology of desulfurized gypsum and gypsum powder, which is applied in the field of gypsum powder preparation, can solve the problems of poor water retention and adhesion, and increase gypsum, and achieve the effect of strong adhesion and …
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Using SEM at a magnification of 8000×, photographs of desulfurized gypsum and carbide slag were taken, as shown in Fig. 1. From the images, it can be observed that the desulfurized gypsum appears as elongated blocky shapes, distributed loosely, while the carbide slag appears as small spherical granules, distributed evenly and densely.
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FGD gypsum with a crystalline water content of 18.60% was supplied by a local thermal power plant. The FGD gypsum was thermally treated at 200 °C to obtain a half-hydrated condition (CaSO 4 ·0.5H 2 O). The chemical compositions of the three raw materials are listed in Table 1. River sand with a fineness modulus of 2.8 and crushed stone with a ...
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The modified phosphorus construction gypsum powder that had been ball-milled for five minutes and then treated at 165 °C had been chosen as the main ingredient for …
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Based on the outcomes of the orthogonal experimental design, it is evident that varying proportions of slag micro-powder, desulfurized gypsum, and cement clinker have a significant impact on the compressive strengths (R 3, R 7, R 28) of the SCM. To validate the results of the orthogonal experiment and to further optimize the mix proportions ...
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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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Various types of retarders have varying degrees of effect on the setting time, mechanical strength, crystal morphology and other properties of gypsum, which are related to …
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The invention discloses a preparation method of desulfurized building gypsum for powder gypsum mortar, which particularly comprises the following steps: 1) selecting flue gas desulfurized gypsum with a water content of below 10%; 2) allowing the flue gas desulfurized gypsum to enter a steam rotary kiln by a desulfurized gypsum charging / conveying system for drying and calcination; …
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In the early stage of hydration reaction, the slag and desulfurized gypsum had the greatest influences, which were attributed to the AFt produced by further reaction between desulfurized gypsum and slag hydration products. Cement clinker had the weakest influences on both the 7-d and 28-d strengths.
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The application discloses the use of desulfurized gypsum. The modified desulfurized gypsum subjected to the thermal calcination treatment for removing the crystal water is applied to the hot-melt welding powder. The desulfurized gypsum can perform oxidation-reduction reaction with aluminum magnesium powder and the like at high temperature, and meanwhile, the …
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Gypsum powder is one of the five major gel materials, occupies an important position in the national economy, widely used in construction, building materials, industrial molds and art models, chemical industry and agriculture, food processing and medicine beauty and many other applications, is an important industrial raw materials.
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In this paper, coal gangue, carbide slag and desulfurized gypsum (DG) were used as raw materials to calcine the all-solid-waste-based belite sulphoaluminate cement (BSAC), …
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the calcined gypsum powder. H owever, as an industrial by-product gypsum, it has some characteristics . of recycled gypsum, ... Neither of them is radioac tive and does not harm health.
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