Investigation on the Dripping Behavior of Primary Slag Melt in the Cohesive Zone of the Blast Furnace Through Iron or Oxide Funnel

高炉粘性区一次炉渣熔体通过铁或氧化物漏斗滴落行为的研究

• 批准号: 09650801
• 负责人: NAGASAKA Tetsuya
• 金额: $ 1.79万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650801/
• 关键词: raw materials for ironmaking; slag; molten oxide; phase diagram of oxide; blast furnace operation; hold-up; surface tension; ironmaking technology; 融液酸化物; raw materials for ironmaking; slag; molten oxide; phase diagram of oxide; blast furnace operation; hold-up; surface tension; ironmaking technology; 融液酸化物

Alumina content in the iron ore imported to Japan is increasing year by year and some problems for the blast furnace operation due to the use of the high alumina containing sinter are reported. Since all of iron ore used in Japanese iron making companies is imported from overseas such as Australia, Brazil and so on, the problems caused by the lower grade ore should be solved as soon as possible. Though the true mechanism of harmful effect of alumina on the blast furnace operation is not known up till now due to the very complex phenomena in the blast furnace, it is generally considered that the alumina in the sinter would act the important role mainly on the behavior of primary melt formed in the sinter during the reduction. Keeping such background in view, this study aims to clarify the mechanism of harmful effect of alumina on the blast furnace operation. The behavior of primary melt, which is formed in the sinter at the cohesive zone of the blast furnace has been simulated by dripping molten slag through iron or oxide funnel. The effects of basicity, A12O3 and Fe_tO_<>O contents in the five kinds of slags on the dripping temperature) and hold-up on the funnel have been discussed. It was found that the eutectic melt formed in the sinter would play important role for the dripping behavior of slag melt in the blast furnace or hold-up phenomenon of slag melt among fine pore in reduced iron and ore particle. Al_2O_<>increases the hold-up degree of the slag melt on the funnel and its effect becomes much significant in the acidic and low Fe_tO_<>O containing slag. It was estimated that the increase of the slag hold-up by Al_2O_<> in the ore could result in the harmful effect on the permeability resistance and indirect reduction rate of the sinter in the blast furnace.

进口到日本的铁矿石中的氧化铝含量逐年增加，由于使用了含有高氧化铝的烧结物，因此由于使用了含有高氧化铝的燃料炉操作问题。由于日本制造公司中使用的所有铁矿石都是从澳大利亚，巴西等海外进口的，因此应尽快解决由低级矿石引起的问题。尽管由于爆炸炉中非常复杂的现象，氧化铝对燃炉操作的有害作用的真正机制尚不清楚，但通常认为，烧结物中的氧化铝将主要是在还原过程中主要取决于在锡罐中形成的原发性熔体行为的重要作用。该研究保持这种背景，旨在阐明氧化铝对爆炸炉操作的有害作用机制。通过通过铁或氧化物漏斗滴入熔融炉渣，已经模拟了在爆炸炉内聚区的烧结区中形成的主要熔体的行为。已经讨论了碱性，a12o3和fe_to _ <> o在滴水温度上的五种矿渣中的含量）和漏斗上的固定。发现在烧结物中形成的共晶熔体对于在爆炸炉中的滴熔熔体的滴注行为或矿渣现象在减少的铁和矿石颗粒中熔化的现象都起着重要作用。 Al_2o _ <>增加了漏斗上炉渣的固定度，其效果在酸性和低Fe_to _ <> o中变得非常重要。据估计，Al_2o _ <>在矿石中增加炉渣的增加可能会导致对爆炸炉中烧结物的渗透性抗性和间接降低率的有害影响。