Kinetics of Carbon Dissolution of Coke in Molten Iron

The effect of temperature on the dissolution rate of carbon from coke in molten iron was investigated using a sampling technique in the temperature range of 1723?K to 1923?K (1450?°C to 1650?°C). The dissolution rate of carbon from coke in molten iron increased as the temperature increased. At 1923?K (1650?°C), the rate-determining step was the mass transfer of carbon in the boundary layer adjacent to the metal-carbon interface. At 1723?K (1450?°C), the rate-determining step changed from the mass transfer to the interfacial chemical reaction as the reaction proceeded. At 1823?K (1550?°C), both reaction steps affected the apparent reaction rates. Sulfur dissolution did not affect the carbon dissolution rates in molten iron, so it was considered that the sulfur adsorption at the metal/coke interface was not so significant. The apparent activation energy of the carbon dissolution of coke in molten iron was estimated to be 442?kJ/mol.     

Dissolution Equilibrium of Calcium Vapor in Liquid Iron

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Interfacial Reactions During Titanium Dissolution in Liquid Iron: A Combined Experimental and Modeling Approach

The dissolution behavior of Ti in liquid Fe has been investigated experimentally and theoretically within the framework of inclusion formation in steel. In the experimental study, Ti cylinders have been immersed into liquid Fe and, subsequently, water-quenched. Macroscopic observation of quenched samples shows the initial solidification of an Fe shell around the Ti. Microstructural analysis of the Fe-Ti interfacial area with a scanning electron microscope equipped with an energy dispersive X-ray spectrometer reveals that a reaction zone develops in a three-step process: formation of a first liquid eutectic layer rich in Ti, formation of a second eutectic layer rich in Fe, and then mixing of both layers. The reaction zone grows in thickness up to 40 pct of the original sample radius and dissolves both parts of the Ti sample and the Fe shell. A simplified, one-dimensional, implicit finite volume model has been used to describe these phenomena theoretically. Good qualitative agreement is achieved between experiment and model. The model has been used to estimate the influence of original addition size, preheating, convection, and superheating on the required melt-back time.     

Dissolution Behavior of Iron and Steel Materials in Liquid Magnesium

Metallurgical and Materials Transactions B - The dissolution of metallic elements from Fe and steel materials into pure liquid Mg was investigated with the aim of improving control of impurities in...     

焦粉粒度对铁矿石烧结过程的影响

铁矿石烧结中焦粉的燃烧过程取决于焦粉的粒度.通过烧结试验,研究了焦粉粒度对烧结性能和质量的影响(针对含10%MAC粉的配矿).通过降低细焦粉粒级(相似文献   

铁液中镁硫平衡

用密闭容器蒸汽法测定了1600℃下,纯铁液中镁硫平衡时的镁硫溶度积为K'_MgS=2.36×10^-4,求得平衡常数K_MgS=2.10×10^-4。     

Fe液中Bi蒸气溶解平衡及第三组元的影响

用密封反应室气液平衡法,测定了Bi蒸气在Fe液中的溶解平衡及第三组元Cr,Cu,C,Al和Si对Bi溶解量的影响,得到Fe液中Bi蒸气溶解反应标准溶解吉布氏自由能与温度的关系式,以及1873K温度下Fe液中第三组元与Bi的活度相互作用系数.     

Effect of Experimental Conditions on Cementite Formation During Reduction of Iron Ore Pellets

Metallurgical and Materials Transactions B - Experiments have been carried out to study the effect of temperature, gas composition, residence time, and type of iron ore pellets on formation of...     

Effect of Rare Earth on theFormation of Liquid ZincCorrosion ResistantChromium-carbide Layer

Effect of Rare Earth on theFormation of Liquid ZincCorrosion ResistantChromium-carbide Layer     

Effect of Mineral on Metallurgical Coke Solution Loss Reaction in Blast Furnace

Thecokesolutionlossreactionisoneofthemostimportanteffectsresultingincokepulverizinginblastfurnace .Thefactorswhichaffectreactionincludecokeporestructure ,micro crystalstructureonporewall ,thecontentandconstituentofminer als ,etc .Amongthesefactors ,theconstituentofmineralsisemphasizedallovertheworldinrecentyears .Buttheemphasisofmoststudieswasputontheeffectofalkalimetals (K ,Na)oncokesolutionlossreactionandtheeffectofotherelementswassel domreported[1-5] .Theeffectofthirteenmineralsoncokesolut…     

混装铁焦对人造富矿还原行为的影响

 高炉炼铁是资源、能源的消耗大户,节能潜力巨大。铁焦是一种高反应性焦炭,将合适粒度和数量的铁焦与含铁炉料混装入炉,从理论上说具有降低焦比,取得节约稀缺炼焦煤资源和降低生产成本的潜力。对混合试样的还原机理进行了分析,并对铁焦与人造富矿的耦合反应进行了实验室研究,证明混入铁焦对烧结矿和球团矿的还原反应有明显的促进作用,提高温度和增加铁焦用量对提高铁矿石的还原度有利。     

Model of Iron Ore Sintering Based on Melt and Mineral Formation

A model of iron ore sintering was built with consideration of fuel combustion,catalysis of sinter mixture as well as formation of melt and mineral,which was verified via sintering pot tests and showed a good fit to the experimental results.The effect of bed depth on temperature was reflected by the residence time in high-temperature zone,rather than the top value of the temperature,which was weakened by melt formation as well as hematite decomposition.Moreover,the effect of bed depth,fuel content and distribution on sintering process was different,which was reflected by temperature profiles and the rule of calcium ferrite formation.The formation of melt as well as magnetite was a process which was decided by kinetic factors,while the formation of calcium ferrite was related to fuel blending conditions,which is determined by thermodynamics when the fuel ratio inside sinter granules is low or fuel content is high,otherwise,it is determined by kinetics.     

Formation of Copper Sulfide Artifacts During Electrolytic Dissolution of Steel

Based on equilibrium considerations, copper sulfide is not expected to form in manganese-containing steel, yet previous workers reported finding copper sulfide in transmission electron microscope samples which had been prepared by electropolishing. It is proposed that copper sulfide can form during electrolytic dissolution because of the much greater stability of copper sulfide relative to manganese sulfide in contact with an electrolyte containing copper and manganese cations. This mechanism has been demonstrated with aluminum-killed steel samples.     

Influence of Iron Ore Characteristics on FeO Formation During Sintering

  The influence of iron ore characteristics on FeO formation during sintering was examined mainly in terms of chemical composition and the melting characteristics of iron ores. Statistical regression and X ray diffraction were used to further explain the specific effect of iron ore characteristics on FeO formation. The results indicate that LOI (loss on ignition) in iron ores have a positive influence on FeO formation by promoting the sintering process of Fe2O3 decomposing and reducing. Silica contents in iron ores play a determining role in final content of FeO in sinter. The melting characteristics of iron ores significantly affect FeO formation during sintering.     

粒度对石油焦硫含量分布及煅烧脱硫的影响研究

通过库伦滴定法分别测定不同粒度石油焦的硫含量及其煅烧后的硫含量。结果表明,粒度对不同硫含量石油焦中硫含量有影响,且差异较大,硫含量2.54%石油焦可筛分出硫含量2.25%石油焦(粒径-0.5mm),3.35%石油焦可筛分出硫含量2.33%石油焦(粒径-0.15mm),硫含量5.98%石油焦筛分的作用较小;粒度对石油焦脱硫具有明显差异,粒度+0.5mm的2.54%石油焦脱硫效果较好,粒度+1mm的3.35%石油焦脱硫效果较好,整个粒度范围内5.98%石油焦脱硫效果差异不大。     

铁液中Al_2O_3纳米颗粒溶解和熔化的热力学研究

与块体材料相比,纳米材料尺寸小、界面能大,导致其溶解和熔化过程的热力学不同于块体材料.从理论上推导了Al2O3纳米颗粒在铁液中的元素平衡溶度积以及熔化温度与颗粒尺寸之间的关系,结果表明,随颗粒尺寸减小,平衡溶度积逐渐增加,熔化温度逐渐下降,而且粒径越小,平衡溶度积和熔化温度的变化率越大.经计算,1873K铁液中Al2O3的质量分数为0.01%时,半径为0.1nm的Al2O3颗粒比块体Al2O3的平衡溶度积增加了11.71%;半径为1nm的Al2O3颗粒在空气和铁液中的熔化温度分别为1849K和1267K,比块体Al2O3的熔化温度分别下降了454K和1036K.