Testing Method of High-temperature Properties of Blast Furnace Burdens

Yamaoka, Yojiro; Hotta, Hirohisa; Kajikawa, Shuji

doi:10.2355/isijinternational1966.22.164

Cited by 5 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slag formation temperature depends on the amount of residual wustite present in the furnace. [19][20][21][22] The iron ore reduction rate (d R/d t) 40 is good and ranges between 0 . 40 and 1 .…”

Section: Discussionmentioning

confidence: 99%

Iron ores, fluxes and tuyere injected coals used in the blast furnace

Cores¹,

Babich²,

Muñiz³

et al. 2007

Ironmaking & Steelmaking

View full text Add to dashboard Cite

Iron ores, fluxes and tuyere injected coals used as burden materials in the blast furnace have been characterised by chemical and granulometric analysis, moisture, density and porosity, softening and melting temperatures, reductibility, X-ray diffraction, electronic microscopy and thermoanalysis. Theoretical calculations on the influence of both the chemical composition and ash content of coals on some aspects of the blast furnace operation have been carried out. The combustion behaviour of pulverised coals in a pilot plant equipped with a combustion chamber has been studied to indicate what the behaviour of each type of coal will be, when injected in blast furnace tuyeres.

show abstract

Section: Discussionmentioning

confidence: 99%

Iron ores, fluxes and tuyere injected coals used in the blast furnace

Cores¹,

Babich²,

Muñiz³

et al. 2007

Ironmaking & Steelmaking

View full text Add to dashboard Cite

show abstract

“…The composition of the gases is changed dynamically during the test and the test ends when the pressure difference over the sample increases to 7 kPa simulating the conditions in the cohesive zone where the reducing gases have major difficulties to penetrate through the material layer. The permeability of a packed bed in the reductionsoftening test decreases drastically before the complete Yamaoka et al 24) 120 mm 50 −100 mm 19) Gustavsson et al 20) 80 mm 70 mm~640 g 30% melting of the iron burden material, and hence only the early stages of the softening and melting can be considered. The final reduction degree and the temperature at the end of the test provide data for comparative studies between different iron burden materials.…”

Section: Borinder and Bimentioning

confidence: 99%

“…Another weakness is that some softening studies comprise only an individual pellet 16,17) or a couple of pellets 2,3,[9][10][11][12][13][14][15]18) instead of a packed bed of pellets. 7,8,[19][20][21][22][23][24][25][26][27][28][29][30] Studies 2,7,[21][22][23][24][25][26][27][28][29] have been carried out for iron ore pellets under load dynamically from ambient temperature to elevated temperatures using a simulated BF gas. Recently, Guha and Sinha 29) presented a modified softening-melting test with a possibility to use a gas composition varying with temperature/time to better simulate the actual conditions in a BF.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Reduction-Softening Behaviour of Blast Furnace Burden with an Advanced Test

et al. 2016

View full text Add to dashboard Cite

A ferrous burden loses its permeability in the cohesive zone of a Blast Furnace (BF), where the iron burden materials soften and melt. A tailor-made, high-temperature furnace named ARUL (Advanced Reduction under Load) was used here to study the reduction-softening behaviour of acid and olivine pellets and basic sinter under simulated BF gas, temperature and pressure conditions.The ARUL test showed the best reduction-softening properties for the basic sinter. The sinter sample resisted up to 1 329°C and achieved a reduction degree of 90.2% until a gas-impermeable structure was formed in a packed bed, whereas the acid pellet lost its permeability at 1 160°C and only reduced to a reduction degree of 48.7%. The olivine pellet had intermediate reduction-softening properties with a final temperature of 1 252°C and a final reduction degree of 68.7%. The differences between the test materials were assessed as being caused mainly by different chemistry, but it was also revealed that the sinter sample remained its macro-porosity markedly better in relation to the pellets, providing routes for reducing gases.The experimental results were compared to the phase diagrams calculated with the computational thermodynamic software FactSage. Phase diagrams for the 5-component FeO-SiO 2 -CaO-MgO-Al 2 O 3 systems with constant CaO, MgO and Al 2 O 3 contents were used to estimate the formation of liquid phases in the test materials. The computed phase diagrams gave an estimate of the liquid formation; however, some limitations were also found in the utilization of the computations because of the need to define the system in certain simplicity.

show abstract

“…22) The sample was first heated to the desired temperature in N 2 . After stabilization of both the temperature and its corresponding thermal expansion, the reduction gas was led into the chamber.…”

Section: Figmentioning

confidence: 99%

Influence of Artificially Induced Porosity on Strength and Reduction Behavior of Hematite Compacts

Higuchi

Heerema

2005

ISIJ Int.

View full text Add to dashboard Cite

With the objective to gain more fundamental understanding of the influence of pore structure on the lowtemperature reduction behavior of iron ore agglomerates, laboratory-scale induration experiments were performed using pure hematite compacts doped with naphthalene as a porosity-generating agent. The pore structure was thus controlled up to 60 % porosity and 1.4 mm pore diameter, and no mineralogical changes were observed in these ranges after induration. The cold strength of indurated compacts was higher with pores smaller than 0.125 mm in diameter, as well as with pores larger than 1 mm. Changes in the cold crushing behavior of indurated compacts are discussed based on matrix length and distribution theory. Reduction tests in CO-CO 2 -N 2 gas at temperatures in the range of 350-800°C revealed high strength after reduction of compacts with fine pores less than 0.125 mm in diameter. Reasons for this high strength were the isotropic stress distribution within the compacts, as well as lower expansion due to development of a complex reduction front.

show abstract

Testing Method of High-temperature Properties of Blast Furnace Burdens

Cited by 5 publications

References 0 publications

Iron ores, fluxes and tuyere injected coals used in the blast furnace

Iron ores, fluxes and tuyere injected coals used in the blast furnace

Evaluating the Reduction-Softening Behaviour of Blast Furnace Burden with an Advanced Test

Influence of Artificially Induced Porosity on Strength and Reduction Behavior of Hematite Compacts

Contact Info

Product

Resources

About