Evaluation of Influence of Briquetted Synthetic Slags on Slag Regime and Process of Steel Desulphurization

Socha, Ladislav; Michalek, Karel; Bažan, Jiří; Gryc, Karel; Machovčák, Pavel; Opler, Aleš; Styrnal, Petr

doi:10.2478/amm-2014-0138

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Within the BOF process, the possibilities of desulfurization are significantly limited by the oxidation conditions. The sulfur distribution coefficient from the first ladle slag at the beginning of the secondary metallurgy process already has higher desulfurization potential, due to the reduction conditions within the slag phase caused by slag modifiers, synthetic slags and the deoxidation of the steel itself during tapping [20,21].…”

Section: Methodsmentioning

confidence: 99%

Deep Steel Desulfurization Practice

Buľko

Molnár

Demeter

et al. 2022

Trans Indian Inst Met

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This article is aimed to study theoretical knowledges related to deep steel desulfurization and their practical application in specific production conditions. The main goal of this study was to verify the efficiency of added CaSi to processed heats in two batches, i.e., first for deep desulfurization at the beginning of the secondary metallurgy and then in a second smaller batch at the end of that process for final modification. At the beginning of the secondary metallurgy process, it was crucial to prepare a suitable chemical composition of ladle slag with advantageous properties for good assimilation of sulfur-based inclusions from desulfurization reactions. Samples were taken of final basic oxygen furnace slag, ladle slag before the deep desulfurization process at the beginning of secondary metallurgy and ladle slag at the end of processing. Detailed cleanliness analyses of steel samples taken from mold during the casting were performed using the Automated Steel Cleanliness Analyses Tool. For better understanding and interpretation of the obtained cleanliness results and their relationship, the following defined parameters were used: ratio of “Ca/Al” oxide inclusions, percentage of “liquid” inclusions and area of CaS inclusions.

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Section: Methodsmentioning

confidence: 99%

Deep Steel Desulfurization Practice

Buľko

Molnár

Demeter

et al. 2022

Trans Indian Inst Met

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“…The parameters influencing the degree of desulphurisation during secondary steelmaking process are reported to be sulphur partition ration (L s ), basicity (B 2 ), Mannesmann index (MM), CaO/Al 2 O 3 ratio (C/A) in slag and easily reducible oxide content (ERO) [16]. Comparison of the above parameters indicated no significant difference between regular and trials heats (Table 7).…”

Section: Strategy To Recycle the Al-killed Steel Ladle Slagmentioning

confidence: 99%

From waste to wealth: recycling the secondary resource from steel ladle as a flux in Si-killed steelmaking process

Bharati

Basavaraja

Jagadeesha

et al. 2018

Ironmaking & Steelmaking

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With the regulations pertaining to the environment and waste disposal becoming stringent day by day, the steelmaking industry is being compelled to adopt a zero-waste-policy for sustainability. As a consequence, 3R (reduce, reuse and recycle) technique of waste handling has become the most favoured option among the industries. This paper focuses on recycling of slag generated after secondary refining process. Trials were conducted in two stages, namely (a) prevention of dusting phenomenon of Al-killed steel ladle slag to generate lump slag by suitably selecting the ladle covering compound and chemically modifying the slag, and (b) utilisation of the lump slag as a 100% replacement of synthetic slag in Si-killed steel ladles, leading to a reduction in its specific consumption from 1.2 kg/TLS to zero. As a process requirement, specific power consumption, arcing time and degree of desulphurisation were considered as the major parameters for comparing the results using hypothesis test statistical tool.

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“…Elimination of the non-metallic inclusions is one of the secondary refinery functions in the steel production process. This process is based on the non-metallic inclusions washout principle into the slag volume [24,25]. Elimination of the non-metallic inclusions is based on the liquid metal bubbling principle by inert gas in the bubbling and rinsing process [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Impact of Interstitial Aluminium Content on Occurrence of Non-Metallic Inclusions in Steel

Rega¹,

Molnár²,

Šolc³

et al. 2016

Acta Metall Slovaca

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This paper details the study of interstitial aluminium impact on non-metallic inclusion occurrence on the basis of individual samples examination taken during steel production and processing. The aim was to identify and describe the relation between the content of interstitial aluminium in metal volume and the concentration of non-metallic inclusions on Al x O y basis occurring in steel. The identification of the non-metallic inclusions occurring in liquid steel was within this study implemented by the (AES) method based on the atom emission spectrometry evaluating the presence of the respective elements in the metal volume. This method works on a principle of emitted light from the existing source with a high voltage spark. The results of this study indicate a correlation between the interstitial aluminium content and concentrations of non-metallic inclusions on the Al x O y basis.Keywords: steel cleanliness, secondary metallurgy, continuous casting, inclusions in steel 1 Introduction It is necessary to ensure and maintain a high purity of produced steel especially for those types designed for a specific application. Regulation of the non-metallic inclusion content, amount and distribution has an essential impact on the steel purity [1]. Development of packaging materials significantly relates to thin electrolytically tinned sheets, which are nearly irreplaceable in some branches of the packaging sector. They are mainly used in the food industry [2-5] thanks to their slim thickness, wide range of mechanical properties, high corrosion resistance and of course their harmlessness to health. The ability to regulate, respectively to control the concentration, morphology and composition of the non-metallic inclusions [6,7] represents one of the most important factors to the improvement of steel purity, respectively the quality improvement of steel products. It is important to study the increased concentration distribution of the nonmetallic inclusions due to its impact on steel product quality in the form of the resulting defects [8,9]. The priority is to decrease the number of defects inside the steel ingot that results from the non-metallic inclusions present in steel [10]. The non-metallic inclusions present in metal are of different origins, e.g. from deoxidation, refractory materials, slag entrainment, casting powders and entrainment of the clogged parts of the submerged entry nozzle into the metal volume [11][12][13][14][15][16]. According to professional literature, during the continuous casting of steel on the casting equipment, casting with stable speeds is preferred. Generally, changes of speed in the casting process in production are inevitable [17]. A negative impact on the non-metallic inclusions to

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Evaluation of Influence of Briquetted Synthetic Slags on Slag Regime and Process of Steel Desulphurization

Cited by 4 publications

References 3 publications

Deep Steel Desulfurization Practice

Deep Steel Desulfurization Practice

From waste to wealth: recycling the secondary resource from steel ladle as a flux in Si-killed steelmaking process

Impact of Interstitial Aluminium Content on Occurrence of Non-Metallic Inclusions in Steel

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