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Coal dust explosion constitutes an ever-present hazard in underground coal mines worldwide. This study examines the effects of important parameters, such as, dust particle size, dust concentration and dust-dispersion-air pressure on rock dust inertant requirement for suppressing coal dust explosion using a Godbert-Greenwald (GG) furnace.
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To prevent coal dust explosions and limit the amount of inhaled dust particles to reduce injury, limestone powder is sprayed along the walls of mines on a regular basis. In the event of an explosion, the surface limestone …
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The coal dust explosion has been tested with various energies of the ignitor, i.e., 4.2 kJ, 6.3 kJ, and 8.4 kJ, to obtain the effect of ignitor energy on the coal dust's Minimum Explosion Concentration (MEC). The results show that the MEC for the 4.2 kJ, 6.3 kJ, and 8.4 kJ ignitor energy are 120 g/m 3, 100 g/m 3, and 70 g/m 3, respectively.
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26 rowsIf the concentration of dust is too low or too high, explosion will not happen. The …
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Limestone powder has increasingly been employed in the production of sustainable concrete. This research shows an optimal design framework for the design of low-CO 2 blended concrete with limestone, considering strength, workability, and carbonation durability in the context of global warming. First, the purpose of the optimal design, i.e., to reduce CO 2 …
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P. Ⅱ 42.5 Portland cement supplied by Anhui Conch Co. Ltd. was used for fabrication of concrete specimens, the Blaine fineness of which being 320 m 2 /kg. Limestone powder (LP) with a Blaine fineness of 732 m 2 /kg was blended in the cementitious system as a mineral admixture. The oxide compositions and particle size distributions of the two raw …
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minimum inerting concentration (MIC) from 1500 g/m3 to approximately 500 g/m3. The MIC is described as the least amount of inertant required to prevent an explosion regardless of fuel concentration. It is interesting to note that the authors report that inerting data in a larger-scale 1m3 test vessel (10 kJ igniter) is approximated by the 20
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Two methods of limestone dust hydrophobization as an antiexplosive agent are proposed: from stearic acid vapour and from silicone solution. A preliminary estimate of the …
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Since the lowest water demand, for a given workability of a binary limestone powder-Portland cement, was obtained for a limestone powder content lower than the one corresponding to the highest packing density, Jones et al. (2003) …
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Limestone (LS) is a sedimentary rock, which occupies around 15 % of the crust of the earth [1], [2].The LS is the almost common pattern of CaCO 3 which is used widely for cement manufacture. Part of CaCO 3 may turn into dolomite by replacement with MgCO 3 at levels up to 46 %. In spite of most of the available limestones are pure, they contain less than 5 % …
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A vertical combustion pipe with half-open was built to study the methane/coal dust deflagration at different concentrations of coal dust and different mass fractions of coal ash. ... According to the study of organic dust explosion, limestone has a significant effect on the minimum ignition temperature of dust layer and cloud, such as flour and ...
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Considering the nature of the substance and the use pattern, environmental concentrations (except on the treated trees) are expected to be too low to measure, consequently a definition of the residue in the environment for monitoring is considered unnecessary for limestone powder (calcium carbonate). ... Limestone powder (calcium carbonate) was ...
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Table 2 - Chemical composition of cement and limestone powder Compound formula Concentration of compound (%) Cement Limestone powder MgO 1.27 1.149 Al2O3 2.56 0.083 SiO2 15.05 0.166 P2O5 0.06 0.013 K2O 0.41 0.011 CaO 72.17 65.71 Fe2O3 4.00 0.057 Magnesium Oxide (MgO) that is contained in cement does not have much different which the …
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Gaetano Cacciatore Inc.-SDS for Limestone January 2024 SECTION VIII – EXPOSURE CONTROLS/PERSONAL PROTECTION Airborne OELs for Components of Limestone: COMPONENT(S) CHEMICAL NAME Limestone Silicon Dioxide, SiO 2 § Aluminum Oxide, Al 2 O 3 Ferric Oxide, Fe 2 O 3 Magnesium Oxide, MgO Calcium Oxide, CaO Sodium Oxide, Na 2 O (5)
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As shown in Fig. 4.2 most of the Portland limestone and composite cements conform to the 32.5 and 42.5 strength classes, although "very high strength" 52.5 Portland limestone cements are also produced. Most countries around the world specify similar chemical and physical requirements for the limestone that can be used, including a minimum CaCO 3 …
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In today's era of rapid infrastructure development, ensuring the durability and environmental sustainability of soil subgrades in road construction remains a critical concern. With recent advancements in non-traditional soil stabilizing binders, including environmentally friendly industrial waste materials such as fly ash and slag, there is growing recognition of the potential …
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Limestone powder (LS) is one of the mineral materials in concrete due to its wide availability and low cost. This paper discusses effects of LS on the workability, setting time, shrinkage, mechanical properties and durability of concrete. Such effects are mainly influenced by many factors, including the particle size and content of LS, the ...
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Limestone (LS) is a sedimentary rock, which occupies around 15 % of the crust of the earth [1], [2]. The LS is the almost common pattern of CaCO 3 which is used widely for cement manufacture. Part of CaCO 3 may turn into dolomite by replacement with MgCO 3 at levels up to 46 %. In spite of most of the available limestones are pure, they contain less than 5 % …
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"Dust explosion needs a very high concentration of dust suspended in the air, which is very hard to find in a mine environment," Luo explained. ... Limestone powder makes it more difficult for ...
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In cements with limestone powder, mono-carbonate is formed instead of mono-sulphate that causes ettringite not be formed and makes concrete more resistant against sulphate attack [10].Note that in temperatures lower than 15°C, thaumasite can be produced [10], [11].The addition of 5% limestone has resulted in a higher compressive strength after 28 days than …
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To study the effect of different concentrations of AlSi12 powder, explosion experiments were conducted with a 20 L spherical explosive device, and the results were shown in Fig. 3. With increasing concentration, the peak pressure produced by the AlSi12 explosion first ascended and then descended, hitting a maximum value of 0.71 MPa at ρ = 750 ...
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In this paper, ten kinds of low-quality coals such as high sulfur, high ash, and low metamorphic degree coals were investigated and the minimum ignition energy (MIE), lower explosion limit (LEL), and explosion intensity (EI) parameters under different particle sizes and coal powder concentration conditions were also analyzed combined with a 1.2 ...
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Dust Explosion Severity In order to assess dust explosion risks, both the severity of a possible explosion and the likelihood of ignition must be determined. To determine the dust explosion severity, the tester suspends a powder sample in a 20-liter spherical explosion chamber and a high-energy ignition source is introduced to cause an explosion.
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To demonstrate the heat sink effect of rock dusting, the entry is dusted with limestone powder at 0.00, 2.23 and 4.80 kg per meter of entry to …
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To demonstrate the heat sink effect of rock dusting, the entry is dusted with limestone powder at 0.00, 2.23 and 4.80 kg per meter of entry to create 0%, 65% and 80% rock dust concentrations, respectively. In an …
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Conversely, Figure (C) depicts the particles of the coal powder explosion product after the introduction of ABC powder. The blast suppression effect of ABC powder protected the coal powder, resulting in the absence of surface pores caused by substance volatilization. ... The mixed system shows the most substantial reduction in P max (33.38% ...
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One important way to stop dust explosions from spreading is to employ powder explosion suppressants [[7], [8], [9]].Wu et al. [10] prepared silica aerogel with diatomite as raw material, analyzed the pyrolysis process of pulverized coal and explosion suppressant by chemical kinetics, and proposed the explosion suppression mechanism.Jiang et al. [11] …
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SAFETY DATA SHEET (SDS) : LIMESTONE S E CT I O N I –I DE NT I F I I O N PRODUCT IDENTIFIER TRADE NAME OTHER SYNONYMS Limestone Crushed Stone Sweet Rock, Aggregate, Aglime, Barn Lime, Coverstone, Fluing Agent, Flexible Base, Manufactured Sand, Mineral Filler, Screenings, Limestone CTB RECOMMENDED USE AND RESTRICTION ON USE
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Rock dusting has been used for about 100 years by applying the inert rock dust (typically limestone or dolomite) to increase the total incombustible content of admixtures and effectively quench the flame propagation and coal dust explosion by acting as a thermal inhibitor or heat sink (Rice, 1914; Amyotte et al., 1995, Man and Teacoach, 2009 ...
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Limestone is abundantly available across the globe, for instance, 18 million, 21.2 million and 30 million tons per annum of LSP is generated in Greece, the UK, and Turkey, respectively [44]. Limestone powder dust constitutes an environmental and health hazards such as cancer and asthma [45].
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It causes the reduction of the system's explosion. So the limestone powder has a bigger efficacy than other anti-explosive agents. By implication, analysis of the thermal decomposition of ...
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For explosion five conditions must be met: • dust must be suspended in air or gas supporting combustion, • must have a particle size capable of propagating a flame, • dust concentration …
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The limestone powder cementitious material used in this experiment is based on a mixture of PII 52.5 Portland cement clinker and limestone powder, with a limestone powder content of 20 % and an average particle size of 13.06 μm. The particle size distribution of cement and limestone powder cement is shown in Fig. 1.
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This work aimed to evaluate the effects of limestone powder (LP) replacement fraction (8–24 wt%) on chloride diffusion and chloride threshold (Cth) for corrosion initiation.
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The effects of limestone replacement fraction, limestone specific surface area and water-to-binder (W/B) ratio on the threshold chloride concentration (TCC) for steel corrosion were evaluated. XRD and SEM analyses were conducted to examine the crystalline phases and microstructure of limestone-blended cement paste, respectively.The influence of pH value of …
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With higher limestone powder content, deviation from the fib equation (4) becomes higher, but strong correlation between these two inverse carbonation resistances exists for both the concrete mixes with 21%–35% limestone powder (R 2 = 0.8) and concrete mixes with 36%–70% limestone powder (R 2 = 0.92), Fig. 6 (b) and (c), and Table 6.
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