New Evaluation Methods Discussion of Softening–<scp>M</scp>elting and Dropping Characteristic of <scp>BF</scp> Iron Bearing Burden

Wu, Shengli; Tuo, Biyang; Zhang, Lihua; Du, Kaiping; Sun, Yanhui

doi:10.1002/srin.201300061

Cited by 20 publications

(7 citation statements)

References 12 publications

(14 reference statements)

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“…For operational purposes, it is preferred to have a deep or low cohesive zone in the BF. It helps in preventing the gas flow close to the wall, which in turn minimizes the coke rate . This can be achieved by having a minimum temperature difference between the softening and melting of ferrous materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of High Temperature Interaction on the Softening and Melting Behaviors of Iron Bearing Materials in the Blast Furnace

Wang

et al. 2018

steel research int.

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The cohesive zone in the blast furnace is largely affected by the softening and melting behaviors of ferrous burden. The Visual High Temperature Method (VHTM) has been employed, in present work, to explore the softening and melting behavior of sinter, two different types of lump ores, and one acid pellet. All iron bearing materials are observed to swell before they shrink. This observation is more dominant in case of dense structured lump ore B. The shrinking temperature intervals are different from one another. This contributes to the gas permeability of ore layer in the cohesive zone because “ore window” is formed. In addition to this, the softening and melting behavior of mixed burdens (consist of sinter and other acid materials) have also been studied. Results display that the softening and melting behavior of all materials are improved. This observation is more dominant for lump ore A. It is attributed to high temperature interactions between sinter and acid iron bearing materials. The high temperature interactivity is largely influenced by the chemical compositions, pore structure, and contact condition. Experimental results of two groups of integrated burdens verify the importance of high temperature interaction for improving the softening and melting characteristics of iron bearing materials.

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Section: Introductionmentioning

confidence: 99%

Influence of High Temperature Interaction on the Softening and Melting Behaviors of Iron Bearing Materials in the Blast Furnace

Wang

et al. 2018

steel research int.

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“…1-4 of Table 3 are shown in Figure 4 As can be seen from the ternary phase diagram of FeO-SiO 2 -CaO(Figure 5), FeO and SiO 2 can well reduce the melting point of slag and form low melting point materials, such as 2FeO•SiO 2 (melting point 1217°C) and CaO x (FeO) 1.81 SiO 2 (melting point 1150 °C) [18]. Ferrous oxide affects the formation of primary slag to a great extent [19]. With the increase in hydrogen content in reduction gas, the reduction rate of iron ore increases, and the content of FeO is reduced, so that the formation temperature of primary slag increases and the formation slag amount decreases, which leads to the increase in initial softening temperature T 10 of furnace charge.…”

Section: Effect Of Hydrogen Content On Softening and Melting Performa...mentioning

confidence: 99%

Softening and melting performance of mixed burden under the simulated hydrogen-rich blast furnace atmosphere

Chen

Geng

et al. 2022

Ironmaking & Steelmaking

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The effects of the application of iron coke in hydrogen-rich blast furnace atmosphere on the softening and melting performance of burden were studied.The results indicated that with the increase in hydrogen content, the cohesive zone of mixed burden became narrower and the permeability of charge was improved, and the suitable hydrogen content was 10vol.-%. The application of iron coke could promote the iron ore reduction and carburizing of iron, decrease the melting temperature by 1-10°C, decrease the dripping temperature by 5-16°C, narrow the cohesive zone, improve the air permeability with S value decrease of 3.19-13.87 kPa °C, and reduce the dissolution loss of coke and ensure the skeleton function of coke. The suitable burden structure was confirmed as follows, i.e. the ratio of pellets and sinter is 4:6, and the ratio of iron coke and coke is 2:8.

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“…Coke-ore mixed charging improved the softening-dripping properties of packed bed, but the fluidity of slag and dropping behavior was bad when coke-ore mixing ratio was increased to 50% [15]. In order to better understand the softening-melting characteristic of iron-bearing burden, Wu et al investigated a new method for evaluating softening-melting behavior, and found that unit charge column maximum pressure drop, pressure drop range, and unit charge column pressure drop can better reflect the permeability and liquid fluidity of burden [16]. The composition of burden has an important effect on the softening and melting properties.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Reduction and Melting Mechanism of Sinter with Different MgO Content

Guo

Shen

Zhang

et al. 2019

Metals

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Adding MgO to sinter is considered to be a popular counter measure to cope with the use of high Al2O3 ores. The purpose of this paper is to investigate the effect of the MgO content on the reduction melting behavior in order to clarify the main mechanism of melting and dripping under simulated blast furnace (BF) conditions. It was found that reduction behavior was inhibited with an increased MgO content; the reduction mechanism was further investigated by means of XRD, SEM, and kinetic analysis. The influence of MgO on the melting mechanism of high basicity sinter was also studied. The softening start temperature and softening temperature increased, and the softening zone increased as a whole with the increased MgO contents from 1.3 to 2.0 wt%. The melting temperature was similar, because the MgO remained in an unslagged state and existed in wustite as FeO-MgO solid solution. The dripping temperature was increased; the main reason for this was that high melting-point slags appeared, and that it was more difficult for carburization to occur with increased MgO content. The most appropriate MgO content in the sinter was 1.3 wt% according to principal component analysis (PCA).

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New Evaluation Methods Discussion of Softening–Melting and Dropping Characteristic of BF Iron Bearing Burden

Cited by 20 publications

References 12 publications

Influence of High Temperature Interaction on the Softening and Melting Behaviors of Iron Bearing Materials in the Blast Furnace

Influence of High Temperature Interaction on the Softening and Melting Behaviors of Iron Bearing Materials in the Blast Furnace

Softening and melting performance of mixed burden under the simulated hydrogen-rich blast furnace atmosphere

High-Temperature Reduction and Melting Mechanism of Sinter with Different MgO Content

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