The soil having pH below about 7 is suitable for ground limestone and CaCO 3 amendment, because, when the pH is higher than 7.0, the effectiveness of limestone as a corrector is significantly reduced as its solubility decreases with increasing soil pH (Oster and Frenkel 1980). Some sodic soils which contain an excess of exchangeable sodium …
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 ...
Desulfurized rubber (DR) and low-density polyethylene (LDPE) were used to modify bitumen. The basic physical properties, rheological properties, chemical composition, thermogravimetric behavior, and morphological characteristics were determined and evaluated to analyze the performance and mechanism of DR and LDPE …
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 …
3,710 kg/h total limestone usage, which maximized the mass flow of low-grade limestone. The maximum blending quantity of low-grade limestone for 2,100 kg high-grade limestone that satisfied the constraints was ~1,610 kg. Keywords: Desulfurization, Limestone, Gypsum, Simulation, Flue Gas, Optimization INTRODUCTION
This paper details the main factors influencing the performance of limestone calcined clay cements (LC3). The kaolinite content plays a major role in the rheological properties as well as strength development. Even in the presence of secondary phases, kaolinite can be accurately quantified by thermogravimetric analysis. The performance …
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.
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 ...
A new wet limestone−gypsum process for flue gas desulfurization (FGD) has been developed. The main difference compared to a conventional wet FGD process is the ability of the new process to ...
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 …
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 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.
To reduce the cost of the current commercial desulfurization and eliminate effluents, the MgO-based desulfurizer fixed bed desulfurization tests were carried out in a dry environment. By means of X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, the absorption effects of the MgO-based desulfurizer on …
To solve the problems of difficult treatment of desulfurized gypsum and overmining of limestone, a kind of lime/gypsum flue gas desulfurization (FGD) …
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.
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 ...
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.
paper presents a comprehensive review of the state of the art in flue gas desulfurization (FGD) technologies for coal-fired boilers. Data on worldwide FGD applications reveal …
The most important controlled variable in a WLFGD plant is the SO2 concentration in the desulfurized gas because regulation SO2 emission limits must be fulfilled. ... With this control strategy the correct amount of limestone is added for the SO2 removal desired, keeping the residual limestone content low and the pH in a favorable range ...
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.
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].
Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft 3 (600 kN-m/m 3)) 1 This standard is issued under the fixed designation D 698; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
In this study, a desulfurization experiment was performed in a bubbling reactor to investigate the effects of adding organic acids, such as formic, acetic, …
Meanwhile, the annual demand for limestone in the world is about 1.2 billion tons and high-quality limestone has low natural resources and low production volume.
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 ...
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 …
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 …
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 …
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 …
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 …
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