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The invention discloses a method for producing limestone powder and aluminum ammonium sulfate from desulfurized gypsum and fly ash of thermal power plants. The method comprises the steps of: (1) paste mixing and impurity removal of the desulfurized gypsum; (2) absorption and reaction of gypsum paste and ammonia gas and carbon dioxide gas; (3) solid-liquid separation …
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The present invention relates to a method for separating calcium sulfate and calcium carbonate from desulfurized gypsum waste (also known as by-product lime) containing calcium oxide, calcium carbonate and calcium sulfate generated in a flue gas desulfurization process. The method of the present invention comprises the steps of pulverizing the waste and mixing it with …
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The sulfation agent used in this study was desulfurized gypsum which is a by-product of the limestone/gypsum production process. The main composition of the gypsum is shown in Table 2. The XRD pattern shown in Fig. 2 (a) indicates that the gypsum waste is mainly composed of CaSO 4 ·2H 2 O, SiO 2, and KCl.
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The experimental analysis revealed that the influence of the desulfurized gypsum content on the strength at 3, 7, and 28 days is greater than that of the cement clinker content. ... with a higher degree of polymerization. Rovnaník [51] proposed a reaction expression for the formation process of N-A-S-H, ... culminating in the computational ...
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In order to obtain high-quality FGD-gypsum from Flue Gas Desulphurisation, the FGD process must attain (1) a high efficiency of particulate controls; (2) causing a low Cl − and F − in FGD …
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This research aims to study the utilization of waste from power plants, construction and demolition, and agriculture by varying the ratios of flue-gas desulfurization (FGD) gypsum, construction and demolition waste (CDW), and oil palm trunks (OPT) in concrete production. This research used these as the raw materials for the production of concrete bricks of 15 × 15 × 15 …
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Tan et al. studied the process parameters of direct wet mineralization of CO 2 with desulfurized gypsum and established a reaction model of direct wet mineralization of CO 2 with desulfurized gypsum in an ammonia medium system. 60 There is a competition between the CO 2 absorption reaction and NH 2 COO − hydrolysis reaction, in which the CO 2 ...
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The chemical reactions involved can be summarized as ... "atmospheric acid solution" to decolor gypsum by controlling the crystallization of the gypsum and the dissolution process. Calcium sulfate gypsum of 98% purity was obtained after three consecutive cycles of purification. ... growth and yield using desulfurized gypsum in the west of ...
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Flue gas desulphurisation gypsum (FGDG) mainly refers to the solid by-product produced via lime gypsum desulphurisation that is performed in various industries to treat flue gas after the combustion of sulphur-containing fuels, such as coal and petroleum [1].In the limestone gypsum flue gas desulphurisation process, 2.7 tons of FGDG can be produced for every 1 ton …
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What is desulfurization gypsum. Desulfurization gypsum, also known as FGD gypsum (flue gas desulfurization gypsum), is an industrial by-product gypsum obtained by desulfurization and purification of flue gas generated after combustion of sulfur-containing fuel (coal, oil, etc.), and its composition is calcium sulfate dihydrate (CaSO 4.2H 2 O).. How desulfurization gypsum comes
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The invention belongs to the technical field of solid waste treatment, and particularly relates to a process method for converting desulfurization gypsum from dry desulfurization ash, which comprises the following steps: step 1, adding water and dry-process desulfurized fly ash into an oxidation tower, and stirring to obtain a dry-process desulfurized fly ash solution; step 2, …
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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 …
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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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The invention discloses a method for producing limestone powder and aluminum ammonium sulfate from desulfurized gypsum and fly ash of thermal power plants. The method comprises the steps of: (1) paste mixing and impurity removal of the desulfurized gypsum; (2) absorption and reaction of gypsum paste and ammonia gas and carbon dioxide gas; (3) solid-liquid separation …
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The cubic hydration kinetics model shows that the BSAC hydration reaction without DG is controlled by the chemical reaction rate and the maximum reaction rate was 0.057 W·g −1, belongs to the phase boundary reaction process. After adding DG, the hydration reaction is mainly determined by the diffusion rate of ions through the hydration layer ...
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Desulfurized gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from flue gas from burning coal or oil. The technology is to grind lime-limestone into powder through a desulfurized gypsum mill, and then configure it into a slurry, so that the SO2-containing flue gas after dust removal is ...
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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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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 …
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CN1203833A CN 98101761 CN98101761A CN1203833A CN 1203833 A CN1203833 A CN 1203833A CN 98101761 CN98101761 CN 98101761 CN 98101761 A CN98101761 A CN 98101761A CN 1203833 A CN1203833 A CN 1203833A Authority CN China Prior art keywords calcium sulfide sodium catalyst magnesium Prior art date Legal status (The legal …
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The concentration of SO 3 2− (C [SO 3 2− ], g/L) was calculated using Equation (4 ... The addition of desulfurized gypsum was found to increase the mixing water demand and prolong the setting ...
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Industrial by-product gypsum, the by-product or waste residue produced by various physical and chemical reactions in the industrial production process [6, 10], has been an important alternative ...
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The core of saline–alkali soil improvement lies in salt leaching by water and reducing alkalinity by improved materials such as acid material or desulphurized gypsum. This study conducted simulation experiments to clarify the impact of furfural residue combined with desulfurization gypsum on saline–alkali soil water–salt and infiltration characteristics in …
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Guo et al. [ 32] determined that a 75% desulfurization gypsum, 5% cement, and 20% mineral powder ratio yielded FGDG blocks with good physical properties.
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For future work, the authors will research the influence of the synergistic effect on the early (0–3 d) hydration process of cementitious materials from the perspective of thermodynamics and molecular dynamics, including the depolymerization process and polymerization process of silicon and aluminum in solid waste and modeling of hydration ...
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When the concentration of ammonium citrate was 10%, the reaction temperature was 70 °C, and when the material to liquid ratio was 1:20, the oxidation rate of CaSO 3 was as high as 98.49% through 10 h of the oxidation reaction. The mechanism equation of the oxidation reaction of CaSO 3 promoted by ammonium citrate is as follows.
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The test results indicated that the average dechlorination rate of the emission reduction process was 80.4%, which is equivalent to 97.5% of the conventional process.
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The utility model provides a system for preparing desulfurized gypsum by utilizing dry desulfurization ash of social waste acid, which comprises a slurry tank, an oxidation tower, a solid-liquid separation device and a distillation device; the slurry tank is used for preparing a dry desulfurization ash solution, and a liquid outlet of the slurry tank is connected with the …
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In the industrial production of China, the processing of phosphate rock, volcanic eruptions, kerosene combustion and aluminum smelting will lead to flue gas emissions containing a large amount of SO 2.SO 2 is a highly irritating gas. Because SO 2 is freely soluble in water and enters the respiratory tract, it can generate corrosive sulfurous acid, sulfuric acid, and sulfate …
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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 significantly improve ...
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The chemical reactions involved can be ... "atmospheric acid solution" to decolor gypsum by controlling the crystallization of the gypsum and the dissolution process. Calcium sulfate gypsum of 98% purity was obtained after three consecutive cycles of purification. ... growth and yield using desulfurized gypsum in the west of Songnen Plain ...
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