共查询到16条相似文献,搜索用时 62 毫秒
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通过对预直炼法前后期总物料平衡计算,得出总石灰耗量、总渣量、总氧气消耗量和渣中铁吹损量。计算结果发现,总石灰消耗、总渣量、铁吹损量随半钢中磷的增加存在最小值,且随中间倒渣量的增加而减小。总耗氧量则随半钢磷的增大有减小趋势。中磷铁水最佳倒渣点应控制前期脱磷率为87%~91%。 相似文献
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通过对预直炼法前后期总物料平衡计算,得出总石灰耗量、总渣量、总氧气消耗量和渣中铁吹损量。计算结果发现,总石灰消耗、总渣量、铁吹损量随半钢中磷的增加存在最小值,且随中间倒渣量的增加而减小。总耗氧量则随半钢磷的增大有减小趋势。中磷铁水最佳倒渣点应控制前期脱磷率为87%~91%。 相似文献
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研究了300t顶底复吹转炉1:10几何相似比的水模型顶枪枪位(150~230mm)和流量(44~48m3/h)对钢液混匀时间的影响。模拟结果得出,最佳枪位为170mm,最佳流量为45m3/h。钢厂300t顶底复吹转炉应用结果表明,顶吹流量60000m3/h和底吹流量1000m3/h时,当顶枪枪位由1900mm改进为1700mm时,碳氧积平均值由原来的27.94降为23.49,提高了转炉内熔池的搅拌效果,吹炼时间由原15.8min降低至15.5min,降低了生产成本。 相似文献
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为研究复吹参数对脱磷转炉混匀行为和脱磷效果的影响,根据相似原理,针对300 t双联脱磷转炉进行实验室的水模拟试验,研究了21种不同底吹元件数量和布置方式,顶吹强度、氧枪枪位以及底吹强度对熔池混匀效果的影响,利用数值模拟方法进行了进一步的分析比较。结果表明,采用8支底吹元件的对称集中布置方式,同时保持较大流量的底吹强度可加强对熔池的搅拌效果。通过工业试验得出,半钢平均磷质量分数由试验前的0.024 9%降低到0.017 3%,半钢脱磷率由试验前的75.3%提高到85.4%,提高了熔池整体的搅拌效率和脱磷效果。 相似文献
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Based on the analysis of reaction mechanism between CO2 and molten pool elements at the steelmaking temperature, and on the calculation of materials and heat balance during converter steelmaking process with blowing CO2, a new technology which uses CO2‐O2 as top gas and CO2 as bottom gas in a converter was proposed and experimented in a 30 t converter. It is found that the new technology is feasible absolutely, the amounts of smoke dust and T‐Fe are reduced by 11.15% and 12.98% on average, the contents of nitrogen and phosphorus are decreased by 50% and 23.33% respectively, iron loss of slag is lowered by 3.10% and oxygen consumption is reduced remarkably. This research will provide a new blowing method for BOF steelmaking process, which can save steelmaking energy consumption and reduce smelting cost. 相似文献
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In order to examine the possibility of recycling BOF slags as dephosphorization and desulphurization fluxes, experiments were performed in a system with liquid iron and artificially prepared fluxes comprising BOF slags, lime and/or sinter ore in a Al2O3 crucible at 1623 and 1673K. The phosphorus and sulphur content in liquid iron were expressed as a function of reaction time in the form of exponential decay of first order. CaF2‐free fluxes comprising BOF slags, lime and/or sinter ore showed very high capacities of dephosphorization and desulphurization, which means that BOF slags could largely be recycled in the hot metal pretreatment processes. 相似文献
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Hong‐Li Zhu Ji‐He Wei Guo‐Min Shi Jie‐Hui Shu Qing‐Yuan Jiang He‐Bing Chi 《国际钢铁研究》2007,78(4):305-310
Mathematical modeling of stainless steelmaking in an AOD (argon‐oxygen decarburisation) converter with side and top combined blowing has been preliminarily investigated. The actual situations of the side and top combined blowing AOD process were analysed. A mathematical model for the whole refining process of stainless steel has been proposed and developed. The model is based on the assumption that one part of the oxygen blown through a top lance reacts with CO escaping from the bath, another part of the oxygen oxidizes the elements in the molten steel droplets splashed by the oxygen jet, and the remaining oxygen penetrates and dissolves into the molten steel through the pit stroked by the jet. All the oxygen entering into the bath oxidizes C, Cr, Si, and Mn dissolved in the steel and also the Fe of the steel melt, but the FeO generated is also an oxidant of C, Cr, Si, and Mn in the steel. During the process, all possible oxidation‐reduction reactions occur simultaneously and reach their equilibria, respectively their combined equilibrium, in competition at the liquid/bubble and liquid/slag interfaces. In the simple side blowing after the top blowing operation is finished, the possible reactions take place simultaneously and reach a combined equilibrium in competition at the liquid/bubble interfaces. The overall decarburization rate in the refining process is the sum of the contributions of both the top and side blowing processes. It is also assumed that at high carbon concentrations, the oxidation rates of elements are mainly dependent upon the supplied oxygen rate, and at low carbon contents, the rate of decarburisation is primarily related to the mass transfer of carbon from the molten steel bulk to the interface. It is further assumed that the non‐reacting oxygen blown into the bath does not accumulate in the steel and will escape from the bath and react with CO in the atmosphere above the bath. The study presents calculations of the refining rate and the mass and heat balances of the system for the whole process. Additionally, the influences of the operating factors, including addition of slag materials, scrap, and alloy agents, the non‐isothermal conditions, the changes in the amounts of metal and slag during the whole refining process, and others have all been considered. 相似文献