Study of a New Operating Practice for Refining High Silicon Hot Metal in a BOF Converter

Barella, Silvia; Cecca, Cosmo Di; Mapelli, Carlo; Gruttadauria, Andrea; Bondi, Enrico; Marinari, Andrea

doi:10.1002/srin.201500283

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…Specifically, silicon concentration and the hot metal temperatures influence the thermodynamics of the process. In the heats featured by the highest Si concentration the formation of the phosphoric anhydride can be suppressed by the high temperatures increase due to the exothermic Si oxidation (805 kJ mol −1 ) that can lead to temperature about of 1750 °C at tapping . In the same way, high temperature of hot metal at the beginning of conversion step reduces the efficiency of phosphorous removal.…”

Section: New Blowing Pattern Design and Validationmentioning

confidence: 99%

Model for Phosphorus Removal in LD Converter and Design of a Valuable Operative Practice

Mombelli

Mapelli

Barella

et al. 2018

steel research int.

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In the primary ironmaking production process, the use of iron ores featured by a high concentration of phosphorus leads to a greater difficulty to manage the refining period of the hot metal by the Basic Oxygen Furnace. Recently, the phosphorus concentration in the hot metal can reach 0.08–0.11 wt% resulting in operative practice troubles for achieving a final P concentration lower than 0.015 wt%. In this study, a kinetic‐thermodynamic model for dephosphorization is proposed and a more efficient dephosphorization procedure of the hot metal in LD converters (350 t) have been developed. The model is a valuable tool to predict the dephosphorization evolution and allows the implementation of a new blowing pattern, able to reach a final P concentration at the end‐point lower than the threshold value of 0.015 wt% with only a slightly increase in lime (+10%) and oxygen consumption (+3%).

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Section: New Blowing Pattern Design and Validationmentioning

confidence: 99%

Model for Phosphorus Removal in LD Converter and Design of a Valuable Operative Practice

Mombelli

Mapelli

Barella

et al. 2018

steel research int.

Self Cite

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“…Refining of high Si hot metal in Basic Oxygen Furnace (BOF) poses several difficulties like high refractory wear, high slopping tendency, high lime consumption, high slag volume, productivity losses, etc. [1,2]. Reduction in hot metal silicon before refining in BOF can be achieved by different ways such as external hot metal desiliconization, which is very often combined with dephosphorization, while other could be achieved through improved blast furnace practices [3].…”

Section: Introductionmentioning

confidence: 99%

Production of low phosphorous steel from low silicon high phosphorous hot metal in BOF

Gupta

Kumar

Babu

et al. 2023

Ironmaking & Steelmaking

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Production of low phosphorous (≤0.015%) steel in Basic Oxygen Furnace (BOF) using high phosphorous (average 0.17%) and low silicon (≤0.5%) hot metal with Si/P ratio <3 is a challenging task. In addition to temperature, slag basicity and FeO, the quantity of slag becomes important which is achieved by higher lime addition. However, how much lime is appropriate need to be understood. A detailed analysis of plant data indicated that a scope exists for lowering lime addition from existing level. Accordingly, systematic trials were conducted with reduction in lime which showed that lowering 12% lime had no effect while 19% reduction increased end blow (EB) P by 20 ppm. SEM-EDX studies of slag samples revealed chemical and morphological changes in trial heats. Lime addition pattern was also found to impact EB P. Addition of lime in a small batch during 10-25% of the oxygen blow resulted lower EB P.

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“…When Si content is higher than 1.0 mass%, double slag method can adopt, but have to pour slag many times to avoid excessive slag spills. It is worth noting that the viscosity of slag increases with the increase of SiO 2 content [12–14]. And the separation of slag and iron is influenced by the viscosity of slag.…”

Section: Introductionmentioning

confidence: 99%

Two-converter steelmaking process for high silicon hot metal

Dai

Shi

et al. 2019

Ironmaking & Steelmaking

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The Corex furnace can produce hot metal without using coke, but the silicon content of the hot metal is abnormal within a week of reopening the furnace. The silicon content of the abnormal hot metal is 2-5.0 mass%. In order to produce with the high silicon hot metal, a new converter steelmaking process is developed. Two converters are used in the operation process. The first converter is used to remove a large amount of silicon of hot metal, and the second converter is used to carry out the decarburization and dephosphorization process. The new converter refining process can treat the high Si content hot metal. But it also brings some new problems. The biggest problem is to control the heat balance of the molten bath. By establishing a regression model and calculation of material and heat balance of BOF 1, the addition amount of slag material and scrap can be obtained under the different conditions of hot metal. After optimization of the new operation, the end point temperature of semi steel is about 1500°C, and the scrap ratio of the whole process is higher than before. The quantity of iron bead taken by per 100 g slag is about 2.3 g, and the T.Fe of slag is less than 5 mass%. On the basis of the same processing time, the optimized new method is more accurate at temperature control of semi steel, more efficient and more reliable.

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Study of a New Operating Practice for Refining High Silicon Hot Metal in a BOF Converter

Cited by 6 publications

References 9 publications

Model for Phosphorus Removal in LD Converter and Design of a Valuable Operative Practice

Model for Phosphorus Removal in LD Converter and Design of a Valuable Operative Practice

Production of low phosphorous steel from low silicon high phosphorous hot metal in BOF

Two-converter steelmaking process for high silicon hot metal

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