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In the case of the production of fluxed pellets, preliminary (prior to dosing) flux components, for example, limestone, also undergo preparation. Limestone with a particle size of 0–80 mm is crushed to a particle size of 0–25 mm and then is pulverized (with simultaneous drying); size of crushed limestone 90–95% fraction—0.05 mm.
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The present work illustrates the effect of limestone and dolomite as flux material in pelletization of an Indian goethetic-hematite iron ore with 59.75% Fe, 4.52% …
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The cohesive zone is a region of low permeability in a blast furnace. This study shows the impact of the chemical composition of pellets on the metallurgical processes occurring in this region during the iron ore reduction process. Sixteen pellets containing varying contents of MgO, CaO, and SiO2 were investigated. The results …
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Effect of limestone and dolomite flux on the quality of pellets using high LOI iron ore | Semantic Scholar. DOI: 10.1016/j.powtec.2020.10.063. Corpus ID: 226333476. Effect of …
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An in-depth study of the consolidation behaviour of high-silica fluxed pellets will help promote the development of a high-proportion pellet smelting process suitable for China ... and the suitable calcium-containing additives were lime and limestone. Compared with acid pellets, the suitable preheating temperature of high-silica fluxed pellets ...
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In limestone-fluxed pellets with bentonite as a binder, although formation of calcium ferrite was noted at the basicity of 0.8, its formation in appreciable quantities was delayed until the basicity of 1.6. For the pellets produced with a combination of dolomite and limestone, even at the basicity of 1.6, only minor amounts of this phase were ...
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Deposit formation in the coal-fired rotary kiln is frequently found in the production of fluxed iron ore pellets by the grate-kiln process and affects normal production. In this paper, the effects of pellet basicity (CaO/SiO2 mass ratio) on the simulated deposit formation were investigated. The results show that the porosity of deposits samples increases from 30.8 …
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The iron and steel manufacturing sector directly accounts for 7–9% of global CO2 emissions. Raw material preparation, such as iron ore sintering, pelletizing, and cock making, is the major CO2 emitter. As climate change becomes a bigger concern, steel manufacturers need to lower CO2 emissions without hindering efficiency or increasing …
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Limestone fluxed pellets were prepared at varying basicity (0 to 0.8) and pyroxenite fluxed pellets at varying MgO contents (0 to 3%) to study their effect on the metallurgical properties. Fired pellets were tested for their strength, RDI, reducibility and swelling. Microstructural studies, optical and SEM-EDS were carried out to quantify ...
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23.24 (not regulated) Distinctive characteristics and properties. Non-flammable, non-explosive. Hazard class 3. Produced from iron ore concentrate with Fe content less than 69.5% . Characterised by high content of useful elements and low content of harmful impurities. Non-flammable, non-explosive, non-toxic.
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Lime, slaked lime, and limestone were used as calcium-containing additives to prepare high-silica fluxed pellets, and the suitable calcium-containing additives were lime and limestone. Compared ...
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Limestone fluxed iron ore pellets are reduced in CO-rich atmosphere generally accompanied by swelling behavior. If the reduction swelling index (RSI) exceeds the normal range (≥20%), it will ...
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commercial blast furnace pellets. One set of pellets was fluxed slightly with limestone (CaCO 3) and was labelled "non-fluxed", while the other one was highly limestone-fluxed and was labelled "fluxed". The CaO content of the pellets was 0.51 wt% and 3.20 wt%, respectively. Chemical analyses of the pellets are presented in Table 1. The ...
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Limestone fluxed pellets are highly porous and therefore very reducible but physically weaker than non-fluxed ones. The CCS distribution (see Fig. 13) is broad and the standard deviation is high for both pellet grades; therefore, the average CCS value alone is not a proper indicator of the mechanical properties of the pellets.
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A laboratory study was carried out to characterize the physical, chemical and mechanical properties of lime fluxed (varying basicity 0–2) hematite iron ore pellets. Lime was used as additive as well as fluxing agent for making iron ore pellets. The effect of additives on different properties of pellets was studied. The findings show that on …
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The CS of high MgO fluxed pellets didn't change significantly when basicity increased from 0.6 to 1.0, on the other hand the CS increased from 2800 N to 3500 N with the basicity increasing from 1.0 to 1.3. Figure 3 displays the effect of the basicity on the porosity of the fluxed pellets. The porosity was gradually decreasing with increasing ...
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Abstract In order to produce high-quality pellets with good reducibility and superior softening and melting properties, certain additives are important. One of the most common fluxing materials for iron ore pellet production is limestone, which is mainly calcium oxide (CaO). In this study, the effect of adding limestone on the metallurgical properties …
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Limestone fluxed pellets. Table 7 shows the chemical analysis of limestone fluxed fired pellets with varying basicity. Conclusions. The following conclusions can be drawn from this work: 1. In the limestone fluxed pellets, with increasing basicity the amount of silicate melt, which acts a bonding phase, found to increase in the fired pellets.
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In limestone fluxed pellets, reduction degradation index dropped considerably with increasing CaO content due to the formation of more amount of bonding phase. Dolomite–pyroxenite pellets, on the other hand, showed lower reduction degradation index up to 0.4 basicity, and beyond that, higher degradation was observed due to the …
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DR Pellet Size Exceeds BF Pellet Size. DR pellets: >50 % + 12.5 mm vs. BF: 9.5 x 12.5 mm target. Benefits of larger pellets : Increase in permeability, increased yield ( fewer smaller pellets degrading into fines), reduced clustering tendency (with a decrease in contacting surface area) Drawbacks of larger pellets :
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An in-depth study of the consolidation behaviour of high-silica fluxed pellets will help promote the development of a high-proportion pellet smelting process suitable for China's resource structure. ... and the suitable calcium-containing additives were lime and limestone. Compared with acid pellets, the suitable preheating temperature of ...
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Improved pellet quality could be attributed to the formation of sufficient amount of silicate melt in basic pellets and high melting point slag in MgO pellets. Limestone fluxed pellets at 0.8 ...
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Utilization of Hydrated Lime as Binder and Fluxing Agent for the Production of High Basicity Magnesium Fluxed Pellets. Deqing ZHU, Dingzheng WANG,* Jian PAN, …
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Improving the Pelletization of Fluxed Hematite Pellets by Hydrated Lime. Deqing ZHU, Deqing ZHU. School of Minerals Processing and Bioengineering, Central …
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Fluxed Pellets were made from the mix of pretreated iron fine ores, binder and limestone in a disc pelletier of 0.8z m in diameter and 0.2 m rim depth, rotational speed at 38 rpm and inclined at ...
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Q.J. Gao et al., Gas-solid reduction kinetic model of MgO-fluxed pellets 13 2. Experimental 2.1. Raw materials For the purpose of improving the quality of oxidized pel-lets and meeting the request for MgO content in BF slag, MgO-fluxed pellets have been widely applied recently. Generally, the MgO content of MgO-fluxed pellets is about 2.0wt%-2 ...
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For the purpose of producing high-quality fluxed pellets, many studies have indicated that additives have prominent effect on the pellet properties [10,11,12,13]. ... and the particle size fractions of limestone and magnesia less than 74 µm were 92.97% and 96.37%, respectively.
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@article{Wang2022DegradationMO, title={Degradation mechanism of high alumina refractory bricks by reaction with deposits in a rotary kiln for fluxed iron ore pellets production}, author={Shuai Wang and Yu-Feng Guo and Jian-jun Fan and F. Chen and Zhuang Yang and Yajing Liu and Lingzhi Yang}, journal={Ceramics International}, …
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Optimized use of limestone–dolomite (1:1) improved the physical and metallurgical properties of the fluxed pellets. Abstract Owing to the depletion of high …
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Optimized use of limestone–dolomite (1:1) improved the physical and metallurgical properties of the fluxed pellets. Abstract Owing to the depletion of high-grade iron ore quality, many steel plants over the world are now using pellets after beneficiation of low grade ores as blast furnace feed.
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