Research on the Reactivity and Grain Size of Lime Calcined at Extra-high Temperatures via Flash Heat

来源 :第十届中国钢铁年会暨第六届宝钢学术年会 | 被引量 : 0次 | 上传用户:panjintao
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  In low-carbon energy-efficient basic oxygen furnace(BOF)steelmaking processes,limestone partly or completely replaces the active lime.The effects of limestone calcination temperature(1200~1500 °C)and time(5~15 min)on lime reactivity and CaO grain size were investigated.The reactivity was evaluated via titration with hydrochloric acid,and the CaO grain size was analyzed using SEM.The results revealed that the temperature exceeded 1300 °C,the reactivity decrease after an appearance of maximum.The higher temperature is,the earlier the peak of reactivity appears.The CaO grains grow with the increase of temperature and time,which leads to the decrease of reactivity.Notably,the effects of temperature on CaO grain size and reactivity are more remarkable than that of time.To obtain active lime calcined at ultra-high temperature by flash heating,the calcination condition should be at 1300~1400 °C for 10~15 min or at the temperature of 1400~1500 °C for 8~10 min.
其他文献
In view of its recognized potential in the improvement of as cast quality of slab,the interest for electromagnetic devices in slab casting has been steadily increasing over the years.By the applicatio
Electromagnetic stirring(ArcSave(R))is a potential and reliable solution for improving the EAF process and reducing the operation cost.Two ArcSave systems have been introduced by ABB in 2014.One ArcSa
高频感应焊(HFW)管线管焊缝冲击韧性存在不稳定现象,在进行同一组的三个试样夏比冲击试验中,焊缝冲击功值出现“两高一低”情况.通过扫描电镜分析了冲击试样残样的断面,冲击功低值的试样断面更平整且断面有残留氧化物夹杂.结合HFW焊管制管中焊接及热处理工艺特点,分析了焊缝冲击功不稳定的原因以及焊接过程中氧化物夹杂形成的原因,提出了控制氧化物夹杂的措施.
中间包电磁感应加热技术,可以有效地补偿钢液的热损失,利于实现低过热度恒温浇注,进而增加等轴晶的比率,改善铸坯质量.中间包感应加热技术越来越受到人们的广泛重视.本研究建立了感应加热电磁、流动和传热的三维数学模型,并对模型的可靠性进行了验证.研究表明,感应电流在注流室、分配室以及两个通道间形成了电流回路,通道内的电流密度远大于注流室与浇注室的电流密度.由于集肤效应与邻近效应,通道靠近线圈一侧的磁场比其
The concept and its characteristics of transverse flux induction heating(TFIH)were introduced,and several typical cases of TFIH development for wide rang size strip were mainly reviewed.Then,according
利用自主开发的多物理场计算程序,紧密结合电渣重熔(ESR)工艺过程特点,建立了适用于ESR过程数值模拟的数学模型,并开发了通用的数值模拟软件.目前,模型可以实现自电极熔化起始直至铸锭模冷结束的全过程的瞬态模拟计算,计算涵盖熔炼过程的电磁场、流动、传热、熔化及凝固多个物理过程,给出了熔炼过程温度及液相体积分数分布、熔池及两相区形状等工艺控制所关心的特征信息的变化过程,同时计算了铸锭质量密切关联的局部
本文针对近几年对于GB/T228.1(ISO6892)推荐方法A的理由的真实性存在很多争议,各方都发表了所依据的数据图表.而根据科学常识同样的材料同样的试验方法不可能得出如此矛盾的结果.《理化检验-物理分册》组织争论的相关方及关注争议的21个实验室共同试验得出了一致的数据.根据21个实验室的数据分析,发现支撑推荐应变控制方法的数据和图表存在一个共同的问题:实际的试验条件不是所报告的试验条件;本文还
One of the most fascinating microstructures found in martensitic steels is that of Fe-12Mn,which spontaneously produces an ultrafine-grained microstructure on quenching,with an effective grain size in
A V modified 12Cr2Mo1R steel plate for pressure vessel was developed to improve the strength of the plate.In this paper,the mechanical properties and microstructures of the newly developed steel plate
The reduction of waste gas losses is often the most effective and economic way to increase the efficiency of industrial furnaces.Regenerative burners achieve highest efficiency but one has accept a ce