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The amount of calcined kaolinite available for reaction is related to the C 3 S and C 2 S content of the clinker [38]. The carboaluminate phase forms when limestone reacts with the alumina phase of the cement and calcined clay, but its development is delayed until sulphates have dissolved in the pore solution [36, 39].
Moreover, the solid waste desulfurized gypsum is used as a sulfate activator. The macroscopic experimental results show that the addition of 2 % biochar can reduce the fluidity of composites by 12.5 % but increase the 28-day compressive and flexural strength by 10.3 % and 19.1 %, respectively.
With the desulfurized ash produced in the typical desulfurization process in a flue gas circulating fluidized bed serving as a sample, by using such methods as theoretical analysis, chemical ...
This paper investigated the modification mechanism of the desulfurized rubber asphalt, and compared its performances with those of crumb rubber asphalt. The microstructures of desulfurized rubber asphalt and crumb rubber asphalt were identified by using the scanning electron microscope technology, component analysis and infrared …
The chemical reaction between the limestone slurry and sulfur in the flue gas produces calcium sulfate, while the limestone slurry is converted into a gypsum slurry by the desulfurization process. The latter is then dehydrated to produce FGD gypsum (as shown in the following equations). 17 Thus, the synthetic FGD gypsum can be used to …
1.1. Flue gas desulfurization processes. The flue gas desulfurization (FGD) processes can be separated into two main categories: once-through and regenerable processes, depending on how the sorbent is treated after SO 2 adsorption (Srivastava and Jozewicz, 2001).Once-through, or non-regenerable, processes utilize the sorbent as a …
The MHSCG samples used in the tests were taken from Gaoping, Shanxi, China, and the total sulfur amount of MHSCG was tested by a sulfur detector (SDS-V) [46], and the sulfur form test [46] was entrusted to Symbol Testing Service Co. Ltd. in Qingdao, Shandong, China. The results are shown in Table 1.The physical and mechanical …
In this procedure we add an excess amount of acid of known concentration, allow it to react with a sample of powdered limestone and then titrate the excess unreacted acid. The complication is mainly mathematical, in that you need to do an extra calculation. This type of analysis is known as a back titration: you add an excess amount of acid to the
With the increasingly stringent emission standards of flue gas, a demonstration project of desulfurizing by "red mud-limestone process" was established to make the flue gas meet the Emission Standards of Pollutants for Aluminum Industry.As shown by the detection results, the emission concentration of Sulfur dioxide (SO 2) was …
Chen [] made statistics on the main physical phases of CDA from steel plant sintering machines and coal-fired power plants, and the results are shown in Table 2.Among the many components, CaSO 3 contains the highest percentage, which is generated by the reaction between SO 2 and lime in the flue gas. The CaCO 3 content is also higher …
In contrast, higher amount of FGDG applied for amendment might be bad for improving soil quality, because higher FGDG amount would diminish the magnitude of decreases in soil bulk density (Table 1). The bulk density of saline-sodic soil is usually high (1.33–1.86 g cm −3 ), which hinders plant rooting and the vertical transport of water and ...
Desulfurization wastewater is industrial wastewater with a high salt content, high metal ions, and high hardness produced by flue gas desulfurization of the limestone-gypsum method in coal-fired power plants. This paper summarizes the source of desulfurization wastewater, water quality characteristics, water quality impacts, and …
Limestone is the most commonly used FGD scrubber due to its easy availability and relatively low cost. Limestone used in wet or spray dried scrubbers is able to remove 95%-99% of the sulfur in the ...
Introduction. Fluoride-related human health hazards are a major environmental issue worldwide. The presence of trace amount of fluoride dissolved from surrounding geological materials are considered advantageous for preventing dental caries while an excess uptake is linked to chronic dental and skeletal fluorosis …
The Portoro "marble" is a fine variety of black limestone from the La Spezia area, in Liguria (North-western Italy), which consists of a Liassic limestone with limonite and calcite veins.
Semi-dry sintering flue gas desulfurized ash (SSFGDA) is a powder mixture of desulfurized products, unreacted desulfurized sorbents and ashes. It mainly consists of CaSO 3 (CaSO 3 ·1/2H 2 O), CaSO 4, CaCO 3, Ca(OH) 2 and CaO, with CaSO 3 accounting for 30–60% of the total content [5], [6]. However, the amount of …
ABSTRACT With the rapid development of desulfurization process, how to efficiently utilize sintered desulfurized dust in the desulfurization process has always been a problem faced by a steel industry. In this paper, the physicochemical properties of Kubasi anthracite coal (RU), Shangwan bituminous coal (SW), and desulfurized dust (TL) were systematically …
Comparative analysis of limestone sludge in recycled water and desulfurization limestone is made in the chemical composition, reaction activity, crystallization properties and pH of Slurry.
A Thermo Scientific ARL OPTIM'X XRF spectrometer has been used to derive limits of detection and precision for the analysis of lime/ limestone. The ARL OPTIM'X is a …
In order to protect national grain safety and ecological safety and develop a sustainable economy,it is important to improve alkaline land with desulfurized gypsum from coal fired power plants.Representative lightly alkalized soil,medium-alkalized soil and seriously alkalized soil in Xidatan of Ningxia Province were selected in the research and used in …
In this study, a desulfurization experiment was performed in a bubbling reactor to investigate the effects of adding organic acids, such as formic, acetic, …
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 ...
From an innovative view point, i.e. the chemical and mineral constituents of desulfurized ash, an analytical study was made. It has been further verified that the dry-method and semi-dry-method ...
Xia et al. prepared a wet desulfurization agent using CDA as a comprehensive replacement for traditional calcium carbide slag and limestone, which …
1. Introduction. Flue gas desulfurization gypsum (FGDG) is an industrial byproduct produced by limestone-gypsum wet desulfurization to treat SO 2 produced by thermal power plants and coal-fired plants, whose main component is CaSO 4 ·2H 2 O. In wet desulfurization, 1 t of SO 2 produces about 2.7 t of FGDG [1], [2].Some 130 million …
XRD, SEM and elemental characterization of FGD gypsum. X-ray diffraction analysis revealed that the characteristic peaks at 2θ value of 11.8, 20.8 and 23.5 (Fig. 2a) of the FGD gypsum 1 suggested ...
The influences of the addition amount of water vapor and humid air as well as the desulfurized flue gas temperature were analyzed based on the property analysis of PM2.5 and SO3 acid mist.
The analysis of limestone gives 60% CaCO3, 33.5% MgCO3, and rest inerts. It is treated with 12% aqueous sulphuric acid (by mass) to obtain pure CO2. An excess of 15% of acid over the stoichiometric amount is used to ascertain that the reaction goes to completion.
Petroleum is an essential source of energy for our daily life. However, crude oil contains various kinds of sulfur-containing compounds that will form sulfur oxides upon combustion and cause severe environmental problems. To …
2017), and limestone dissolution (Carletti et al. 2015), have been comprehensively studied and shown good agreement with experimental and industrial results. At the same time, data-driven models, based on the large amount of operating data and machine learning plat-forms, are also generated using various methods such