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首页> 外文期刊>ISIJ international >Effects of 2CaO?SiO2 and 2CaO?Al2O3?SiO2 on Primary Slag Melting of Sinters in the Cohesive Zone of a Blast Furnace
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Effects of 2CaO?SiO2 and 2CaO?Al2O3?SiO2 on Primary Slag Melting of Sinters in the Cohesive Zone of a Blast Furnace

机译：2CaO？SiO 2 和2CaO？Al 2 O 3 ？SiO 2 对烧结矿初熔的影响在高炉内聚区

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To investigate the relation between Al_(2)O_(3) and the gas permeability resistance in a blast furnace, the effect of Al_(2)O_(3) on the increment in the slag melt volume and the decrement in the temperature of the slag melt formation has been elucidated by comparing the reactions between liquid olivine and solid 2CaO?SiO_(2) and between liquid olivine and solid 2CaO?Al_(2)O_(3)?SiO_(2) at the constant temperature of 1240°C, and eutectic reactions between FeO and 2CaO?SiO_(2) and between FeO and 2CaO?Al_(2)O_(3)?SiO_(2) at the constant heating rate of 10°C/min. The reaction temperature of 1240°C has been chosen because the effect of Al_(2)O_(3) on the gas permeability is markedly observed at that temperature. The heating rate has been set to be 10°C/min as it is considered to be the approximate heating rate of burden in a blast furnace. The fraction of the liquid phase decreases from 38.3% to 30% for olivine-2CaO?SiO_(2) system, while it increases from 23.5% to 27.4% for olivine-2CaO?Al_(2)O_(3)?SiO_(2) system in 10 min after the onset of heating. It is considered that the increment in the Al_(2)O_(3) content of iron ores raises the amount of olivine-like slag melts around 1240°C. The onset temperature of eutectic reaction for mixed FeO and C2AS powders is almost equal to that for mixed FeO and C2S powders when the temperatures are compared for powders with the average particle size smaller than around 40 μ m. This implies that a negative effect of Al_(2)O_(3), that is, lowering the temperatures of slag melt formation could be eliminated when the microstructures of sinters are fine enough.
机译：为了研究高炉中Al_（2）O_（3）与透气阻力之间的关系，研究了Al_（2）O_（3）对炉渣熔体体积增加和温度降低的影响。通过比较液态橄榄石和固体2CaO？SiO_（2）之间以及液态橄榄石和固体2CaO？Al_（2）O_（3）？SiO_（2）之间的反应在1240°C恒定温度下的熔渣形成并且，在恒定的10℃/ min的升温速度下，FeO和2CaO·SiO_（2）之间以及FeO和2CaO·Al_（2）O_（3）→SiO_（2）之间发生共晶反应。选择反应温度为1240℃是因为在该温度下明显观察到Al_（2）O_（3）对气体渗透性的影响。加热速度设定为10℃/ min，因为它被认为是高炉中炉料的近似加热速度。橄榄石2CaO2SiO_（2）体系的液相分数从38.3％降低到30％，而橄榄石2CaO2Al_（2）O_（3）？SiO_（2）液相份额从23.5％增至27.4％ ）系统在加热开始后的10分钟内。据认为，铁矿石的Al_（2）O_（3）含量的增加增加了约1240°C的橄榄石状熔渣的熔化量。当比较平均粒径小于约40μm的粉末的温度时，混合的FeO和C2AS粉末的共晶反应开始温度几乎等于混合的FeO和C2S粉末的温度。这意味着当烧结体的微观结构足够细时，可以消除Al_（2）O_（3）的负面影响，即降低熔渣形成温度的负面影响。

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