Kinetics and Mechanisms of Dolime Dissolution in Steelmaking Slag

Cheremisina, Elizaveta; Schenk, Johannes; Nocke, Ludwig; Paul, Alexander; Wimmer, Gerald

doi:10.1007/s11663-019-01560-w

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…Moreover, the basic slag former additions enable the stable electric arc furnace (EAF) treatment operation based on the foamability of the slag. [ 1–11 ]…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneously, the specific surface area of the dolomite‐based mineral increases because the molar volumes of the oxides are lower than those of the carbonates, resulting in pores after the calcination. [ 5,9,12–21 ]…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the basic slag former additions enable the stable electric arc furnace (EAF) treatment operation based on the foamability of the slag. [1][2][3][4][5][6][7][8][9][10][11] Dolomite is composed of calcium magnesium carbonate (ideally CaCO 3 .MgCO 3 ) and its calcination proceeds gradually. At temperatures of 600-700 C in air atmosphere, MgCO 3 decarbonates first.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneously, the specific surface area of the dolomite-based mineral increases because the molar volumes of the oxides are lower than those of the carbonates, resulting in pores after the calcination. [5,9,[12][13][14][15][16][17][18][19][20][21] Conventionally, the energy-intensive calcination of additives is carried out in rotary or shaft kilns, followed by cooling and transport to the steelmaking industry. Even though the handling, transport, and charging performance increase due to higher strength and abrasion resistance of calcined materials, the direct applicability of unburnt material may provide advantages regarding the costs, environmental aspects, and dissolution behavior.…”

Section: Introductionmentioning

confidence: 99%

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Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Lesiak¹,

Cheremisina²,

Rieger³

et al. 2022

steel research int.

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The addition of basic additives in steelmaking processes is essential because these lead to slag adaptation and enable refining reactions. In calcination treatment, the process parameters temperature and dwell time influence the decomposition of dolomite as a magnesium‐containing lime substitute. It results in specific properties such as varying residual fractions of carbonates CaCO3·MgCO3 and porosity. The properties affect the dissolution kinetics, and the fast and complete dissolution is of interest. Hence, the static high‐temperature dissolution tests using dolomite‐based samples in diverse conditions (raw, modified, soft‐burnt, and hard‐burnt) are executed to determine the impact of the calcination state. The specimens are immersed in synthetic electric arc furnace slag, including 10 wt% Al2O3, 25 wt% SiO2, 25 wt% CaO, 8 wt% MnO, and 32 wt% FeO. The dolomite or dolime dissolves in the stagnant oxidic melt within the reaction time of 10 min at 1450 °C. The resulting chemistries of quenched slags, representing the current dissolution status, are examined by scanning electron microscopy using energy‐dispersive X‐ray spectroscopy analysis on metallographically prepared cross‐sections and via X‐ray fluorescence analysis of mechanically extracted slag fractions. The dissolution performance is characterized and compared for the different additive materials.

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“…Moreover, the basic slag former additions enable the stable electric arc furnace (EAF) treatment operation based on the foamability of the slag. [ 1–11 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Lesiak¹,

Cheremisina²,

Rieger³

et al. 2022

steel research int.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, the consumption of refractory materials is one of the main costs of BF smelting. Thus, inhibiting the interaction between slag and refractory materials is expected to be an effective means to reduce the consumption of refractory materials [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Erosion Behavior of FeO-CaO-SiO2-MgO-Al2O3 Blast Furnace Primary Slag on Al2O3 Substrate

et al. 2021

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Al2O3 substrate is widely used as a lining refractory material throughout the blast furnace (BF) process. Accordingly, the erosion of Al2O3 refractory by molten slag has a negative influence on the running cost and smooth operation of BFs. The effect of the erosion behavior of BF primary slag containing FeO-CaO-SiO2-MgO-Al2O3 on Al2O3 substrate refractory was fundamentally investigated using the high-temperature contact angle method and FactSage thermodynamic software based on the composition of BF primary slag in a typical iron and steel enterprise of China. The results showed that the primary slag mentioned above was easily wetted with Al2O3 substrate, and the observed contact angles were 24.5° and 22.0°, when the FeO mass fraction (w(FeO)) was maintained at 10% and 15% of the primary slag, respectively. Moreover, the starting melting temperature of the primary slag with high FeO content, of 1263 °C, was lower. The erosion thickness between the slag and Al2O3 substrate increased from 19.23 to 23.17 μm as the added w(FeO) increased from 10% to 15%. In addition, it was observed via SEM-EDS analysis that the interface layer was formed, and high-melting-point compounds were generated during the wetting process. This was attributed to the interaction between the molten slag and Al2O3 existing in the substrate, which may have inhibited the continuous dissolution of the Al2O3 in the substrate into slag. Good surface wettability and the dissolution of the Al2O3 substrate refractory into the primary slag of the BF are two dominant factors leading to the erosion of the refractory.

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Numerical Treatment of Oxide Particle Dissolution in Multicomponent Slags with Local Gibbs Energy Minimization

Ogris

Gamsjäger

2022

steel research int.

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Herein, a diffusion model for the dissolution of oxide particles in multicomponent slag systems is developed. It is assumed in this model that a sharp-interface separates the solid particle from the liquid slag. Minimization of the Gibbs energy provides the conditions at the interface. The differential equations for multicomponent diffusion in the liquid slag are solved numerically via a finite-difference scheme. It is indicated via parameter studies that the diffusion controlled dissolution kinetics may result in strongly different dissolution profiles depending on the initial conditions. It is demonstrated that the rate-controlling dissipative process is the diffusion of components for cases where earlier investigations claimed that a coupled diffusion-reaction process is in charge of the dissolution kinetics. Eventually, the numerical results are compared to data obtained from high-temperature laser scanning confocal microscopy (HT-LSCM) experiments.

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Kinetics and Mechanisms of Dolime Dissolution in Steelmaking Slag

Cited by 6 publications

References 14 publications

Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Calcination Condition of Dolomite‐Based Materials Influencing Static Dissolution in Synthetic Electric Arc Furnace Slag

Effect of Erosion Behavior of FeO-CaO-SiO2-MgO-Al2O3 Blast Furnace Primary Slag on Al2O3 Substrate

Numerical Treatment of Oxide Particle Dissolution in Multicomponent Slags with Local Gibbs Energy Minimization

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