Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

Jiao, Kexin; Zhang, Jianliang; Liu, Zhengjian; Kuang, Shibo; Liu, Yanxiang

doi:10.2355/isijinternational.isijint-2016-419

Cited by 53 publications

(35 citation statements)

References 21 publications

(22 reference statements)

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“…For the softening zone, the results show that with the concentration of CO 2 in ABOFG increasing from 0% to 30%, T 4 decreased from 1187 to 1173 °C, T 40 decreased from 1271 to 1254 °C, and [ T 40 – T 4 ] reduced from 84 to 81 °C. These variations indicate that the softening process of HCVTM ore occurred even earlier, and the position and height of the softening zone declined, which were beneficial to the improvement of the gas permeability in the block‐softening zone . In addition, for the melting–dripping zone, as the concentration of CO 2 in ABOFG increased from 0% to 30%, T s was almost maintained at about 1322 ± 2 °C, and T d decreased from 1517 to 1500 °C.…”

Section: Resultsmentioning

confidence: 96%

“…The gas permeability index S is closely related to the pressure drop, and the higher S , the worse the gas permeability . Figure shows the burden pressure in temperature between T s and T d , and the gas permeability index S is calculated from Equation , in which Δ P s refers to the differential pressure in melting temperature T s and Δ P refers to the differential pressure drop in different test temperatures.

\int_{T_{s}}^{T_{d}} (Δ P - Δ P_{normals}) d T

…”

Section: Resultsmentioning

confidence: 99%

“…Jiao et al showed that considerable titanium compounds are formed in the eroded furnace wall below the taphole level, and the titanium carbonitride phase is formed within the hot metal, whereas the slag phase originates from the interaction between the mineral in coke and final slag in the BF hearth. Liu et al claimed TiC 0.3 N 0.7 proved to be formed on the protective layer of the hearth, which greatly affects the fluidity of the BF slag and the successful separation of slag and metal.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, Ti also forms a complex anosovite phase with O, Ca, Si, and Al in the slag phase. The higher the content of Ti in the anosovite, the greater the specific gravity and viscosity, which will make the separation of dripped slag and iron more difficult …”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Abandoned Basic Oxygen Furnace Gas Blowing on the Softening–Melting–Dripping Performance of Full High Cr‐Bearing Vanadia–Titania Magnetite Pellets

Song

Zhang

Cheng

et al. 2019

steel research int.

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It is inevitable to encounter increase in slag thickness, foaming slag, and high iron loss due to excessive formation of titanium carbonitride in blast furnace smelting of full high Cr‐bearing vanadia–titania magnetite (HCVTM). The effects of softening–smelting–dripping properties, the content variation of titanium carbonitride, and mineral element migration process of full HCVTM pellets with abandoned BOF gas (ABOFG) blowing are studied using X‐ray diffraction (XRD), X‐ray fluorescent (XRF), inductively coupled plasma‐atomic emission spectroscopy (ICP‐AES), X‐ray photoelectron spectroscopy (XPS), electron probe microanalysis‐wavelength‐dispersive spectrometer (EPMA‐WDS), and scanning electron microscope‐energy dispersive spectroscopy (SEM‐EDS). ABOFG is a type of neglected byproduct gas resource produced in the steelmaking process with high physical and chemical thermal energies and contains 20–40% CO, 20–30% CO2, 2–5% O2, and 30–50% N2. As the concentration of CO2 in ABOFG increases, the position and height of the cohesive zone decline, and the concentration of titanium carbonitride decreases from 1.424% to 1.035%, which are beneficial to the BF smelting process. In addition, the migration processes of Ti, V, and Cr are also affected, especially Ti tends to enrich in the dripped slag, whereas V and Cr tend to concentrate at the dripped iron.

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Section: Resultsmentioning

confidence: 96%

\int_{T_{s}}^{T_{d}} (Δ P - Δ P_{normals}) d T

…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Abandoned Basic Oxygen Furnace Gas Blowing on the Softening–Melting–Dripping Performance of Full High Cr‐Bearing Vanadia–Titania Magnetite Pellets

Song

Zhang

Cheng

et al. 2019

steel research int.

View full text Add to dashboard Cite

show abstract

“…26,27) It is difficult for blast furnace slag to dip below the taphole level directly because the considerable variation of density exists between the hot metal and liquid slag. However, blast furnace slag can enter the salamander indirectly.…”

Section: The Source Of Blast Furnace Slag Phase In Thementioning

confidence: 99%

Changes in Microstructure and Chemical Composition of Deadman Coke of a 2800 m<sup>3</sup> Industrial Blast Furnace

Niu

Cheng

et al. 2018

ISIJ Int.

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The paper examined the changes in microstructure and inorganic elements in their true mineral forms of the coke samples from various hearth locations using X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) after the blow out and cool down of a 2 800 m 3 industrial blast furnace. The results illustrate that all deadman coke samples from fines to lumps were confirmed to be highly graphitized. Furthermore, the deadman coke was filled up with the accumulated KAlSiO 4 during its descent process and the blast furnace slag which consisted of Ca 2 MgSi 2 O 7 -Ca 2 Al 2 SiO 7 system and Ca 2 ZnSi 2 O 7 phases. Besides the slag phases, the iron was also observed in the deadman coke soaked in the iron layer. Those cause that the mass of the deadman coke is about 1.62-2.82 times larger than that of the feed coke under the same conditions. Thus it may make the deadman which was designed to float sit on the hearth bottom as the permeation of the slag and the liquid iron into the deadman coke was not taken into consideration during the design process. We concluded that the slag phase below the taphole level is primarily derived from the blast furnace slag. Moreover, the deadman coke carrying final slag may come in contact with the hearth bottom and react with ceramic pad or carbon brick with a sitting deadman, thereby it results in degrading the hearth lining. Meanwhile, the slag phases below the taphole level can provide the material for the formation of skull to protect the hearth lining.

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Optimization of Ironmaking Blast Furnace Operations Using an Integrated Mathematical Model

Liu

Kuang

Guo

et al. 2022

Chemie Ingenieur Technik

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Ing. Joachim Werther on the occasion of his 80th birthdayOptimization of ironmaking blast furnaces (BFs) must consider bottom and top operations. This is done by a recently developed integrated BF model covering the BF below the burden surface. Key operating parameters are focused, viz. coal rate, oxygen enrichment, blast temperature, and burden central opening extent. Numerical orthogonal experiments are thus conducted. Fitting the simulation data yields a set of empirical correlations predicting BF performance indicators. After the fitting accuracy test, the correlations are used for multi-objective optimization and operatable zone identification.

show abstract

Dissection Investigation of Ti(C,N) Behavior in Blast Furnace Hearth during Vanadium Titano-magnetite Smelting

Cited by 53 publications

References 21 publications

The Effect of Abandoned Basic Oxygen Furnace Gas Blowing on the Softening–Melting–Dripping Performance of Full High Cr‐Bearing Vanadia–Titania Magnetite Pellets

The Effect of Abandoned Basic Oxygen Furnace Gas Blowing on the Softening–Melting–Dripping Performance of Full High Cr‐Bearing Vanadia–Titania Magnetite Pellets

Changes in Microstructure and Chemical Composition of Deadman Coke of a 2800 m<sup>3</sup> Industrial Blast Furnace

Optimization of Ironmaking Blast Furnace Operations Using an Integrated Mathematical Model

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