Testing Method of High Temperature Properties of Blast Furnace Burdens

Yamaoka, Yojiro; Hotta, Hirohisa; Kajikawa, Shuji

doi:10.2355/tetsutohagane1955.66.13_1850

Cited by 16 publications

(11 citation statements)

References 1 publication

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“…6,7) Since, the softening, melting, and dripping of ore are comprehensively evaluated during the softening test under loading, it was not possible to clarify each phenomenon and their causal relationships. In order to reduce the thickness of the cohesive zone, researchers have proposed to increase the liquid phase formation temperature of the ore. 9,10) However, the studies that have been conducted on the high temperature softening and low temperature dripping of iron ore are insufficient.…”

Section: (Received On May 19 2015; Accepted On June 22 2015)mentioning

confidence: 99%

“…The ore layer exhibits a solid-liquid coexistence at the cohesive zone, and the permeability decreases. The loss of pressure in the furnace is considerably owed to the softening of the ore in the cohesive zone; 6,7) for a lower coke rate operation, an improvement in the permeability of the cohesive zone is required. The loss of pressure in the whole furnace can be decreased by decreasing the thickness of the cohesive zone in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

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Softening, Melting, and Permeation Phenomena of CaO–FeO–SiO<sub>2</sub> Oxide on a Coke Bed

Ueda

Kon

Miki³

et al. 2015

ISIJ Int.

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Section: (Received On May 19 2015; Accepted On June 22 2015)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Softening, Melting, and Permeation Phenomena of CaO–FeO–SiO<sub>2</sub> Oxide on a Coke Bed

Ueda

Kon

Miki³

et al. 2015

ISIJ Int.

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“…The second step is of particular importance in practice because the reaction rate at higher temperatures dominates the overall reduction efficiency of a blast furnace. [4][5][6] There are two types of wüstite in reduced sintered ores: one is wüstite (donated as FeO) reduced from hematite containing less impurities and the other is calcio-wüstite (donated as CW) reduced from CF: both FeO and CW have the rock-salt structure. CW contains CaO and other gang components such as MgO, SiO 2 and Al 2 O 3 as solutes, and thus its reducibility could be different from that of FeO.…”

Section: Introductionmentioning

confidence: 99%

Reducibilities of Wüstite and Calcio-wüstite in Terms of High Temperature X-ray Diffraction Analysis

et al. 2017

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Reducibilities of wüstite and calcio-wüstite have been examined using high temperature X-ray diffraction analysis including the effect of hydrogen on the reducibility. Fe 2 O 3 reagent powders and hematite ore powders were used for reduction of wüstite (denoted as FeO) and sintered ore powders were used for reduction of FeO and calcio-wüstite (denoted as CW). High-temperature X-ray diffraction was applied to these samples in a flow of CO-CO 2 -He mixtures with and without 3.9 vol% of hydrogen during the heating cycle which simulates a blast furnace condition. The diffraction angle was scanned in the range from 33° to 55°. In experiment on sintered ore powders without hydrogen, the main peak around 48.5° shifted to lower angles with increasing temperature. This shift also continued while temperature was kept at 1 000°C where wüstite was saturated with iron; on the contrary, the peak shift did not take place for hematite ore powders. This main peak is associated with wüstite (200), which is actually composed of peaks due to FeO and CW for sintered ore powders. The peak shift reflects that the peak intensity of CW increases relative to that of FeO, which suggests that the reduction of FeO proceeds faster than that of CW, and the reducibility of FeO is higher. In contrast, the peak shift did not take place in experiment on sintered ore powders with hydrogen additions. This suggests that the reducibility of CW is comparable to that of FeO in the presence of hydrogen.

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“…3,[6][7][8] The apparent softening viscosity is a value representing the shrinking resistance of an overall packed bed, and is defined in Eq. The apparent softening viscosity calculated from the experimental results is shown in Fig.…”

Section: Evaluation Of Shrinking Behavior According Tomentioning

confidence: 99%

“…And testing methods for high temperature properties' estimation of blast furnace burden materials have been developed and thus are now extensively diffused and actively exploited. [2][3][4] However, while various indexes 4,5) are presented regarding elucidation of the relation between the softening and melting behavior of respective raw materials for a blast furnace and operation result of blast furnaces, no satisfactory knowledge has been acquired concerning the effect of diverse factors such as composition and reduction behavior affecting the softening and melting behavior of raw materials for a blast furnace. In particular, concerning shrinking behavior, while many trials 3,[6][7][8] have been conducted to organize data according to softening viscosity, no synthetic evaluation of various blast furnace burden materials has been available.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Softening, Shrinking and Melting Reduction Behavior of Raw Materials for Blast Furnace

et al. 2011

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To evaluate influences on the softening and melting behavior of blast furnace raw materials, the examinations of high temperature properties in various types of raw materials for blast furnaces were executed. Shrinking behavior before reaching approximately 1 300°C is estimated by using softening viscosity taking into consideration pores of particles, and void ratio as well as liquid phase ratio of the layer. The softening viscosity of the solid phase of approximately 10 10 Pa·s was obtained and the influence of the mineral species of the solid phase or temperature is small. Melting reduction sharply progresses through expanding the liquid phase deriving from FeO and gangue. And this behavior is affected with position of the reduction curve and the liquidus curve. Sinter forms a solid phase from FeO and gangue due to a rise of reduction degree according to melting reduction. This solid obstructs contact of the liquid phase including FeO with coke, which restricts the progress of melting reduction. On the other hand, with lumpy ore and pellet, melting reduction rapidly progresses without interruption, since no solid phase is formed even when FeO decreases due to melting reduction.

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Testing Method of High Temperature Properties of Blast Furnace Burdens

Cited by 16 publications

References 1 publication

Softening, Melting, and Permeation Phenomena of CaO–FeO–SiO<sub>2</sub> Oxide on a Coke Bed

Softening, Melting, and Permeation Phenomena of CaO–FeO–SiO<sub>2</sub> Oxide on a Coke Bed

Reducibilities of Wüstite and Calcio-wüstite in Terms of High Temperature X-ray Diffraction Analysis

Evaluation of Softening, Shrinking and Melting Reduction Behavior of Raw Materials for Blast Furnace

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