Limestone dissolution and decomposition in steelmaking slag

Mao, Wenwen; Li, Chenxiao; Lu, Haifei; Li, Hong; Xie, Wei Min

doi:10.1080/03019233.2017.1326549

Cited by 9 publications

(15 citation statements)

References 17 publications

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“…Rather, the gas bubbles, while charging raw dolomites and modified dolomites, observed to a lower extent for the latter ones, promoted the slag contact with the newly generated sample surface-without reaction retarding high-melting phases-and facilitated the dissolution of the additives, resulting in the highest amounts of dissolved MgO and CaO for the raw dolomite specimens. Similar improvements of dissolution behavior by in situ calcination of limestone were observed by Mao et al [35] The lower amounts of dissolved hard-burnt dolime might be explained by the sintering of particles during rougher calcination and consequently, lower slag penetration and contact area.…”

Section: Sem/edx Analysis and Concentration Profile Generationsupporting

confidence: 79%

“…The importance of such dissolution models for basic slag additives in steelmaking has been justified by the endeavors of many researchers. [3,[5][6][7]15,22,30,31,[34][35][36][37][38][40][41][42][43][44][45] Finally, trials under dynamic conditions with the tested materials will indicate the transformability of the results to the industrial process.…”

Section: Discussionmentioning

confidence: 99%

“…Several researchers [2,6,15,22,27,[30][31][32][33][34][35][36][37] have paid attention to the interfacial reaction layers that form between the bulk slag and the CaO-or MgO-containing additive or refractory material, whereas Guo et al [31] observed that the interlayer on CaO particles disappeared in the presence of MgO in slag. However, as stated by Liu et al, [34] the local equilibrium at the slag-sample interlayer with some present phases gives no information about the overall slag chemistry.…”

Section: Sem/edx Analysis and Concentration Profile Generationmentioning

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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Section: Sem/edx Analysis and Concentration Profile Generationsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Sem/edx Analysis and Concentration Profile Generationmentioning

confidence: 99%

See 1 more Smart Citation

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 reactions are shown in Equation (4)–(6). [ 12–16 ]

\text{CaO+} \left(\right. \text{FeO} \left.\right) \rightarrow \text{(CaO} \cdot \text{FeO)}

$$\text{CaO+} \left(\right.

…”

Section: Discussionmentioning

confidence: 99%

Evolution of Interface Characteristic between Quicklime and CaO–SiO₂–Fe_tO–MgO Melt during Slag‐Forming Procedure in Converter under Different Times

Zhang

Jia

et al. 2023

steel research int.

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In 2022, China produced 1.018 billion tons of crude steel, with steel slag accounting for 10–15% of the output. The presence of 10–20% f‐CaO in steel slag causes volume instability, hindering comprehensive utilization. The generation of f‐CaO is closely associated with the dissolution of quicklime during the converter slag‐forming procedure. This study focuses on investigating the evolution of the lime–slag interface and the variations in lime dissolution rate under different slag conditions using the electron probe microanalyzer and ImageJ. The results reveal that the formation of the CaO–FeO solid solution, (Ca, Mg, Fe) olivine, and low‐melting point (Ca, Mg) olivine at 1400 °C. As the FeO content decreases, a dense and high‐melting‐point 2CaO·SiO2 layer is formed. A maximum thickness of the 2CaO·SiO2 layer is precipitated at a dissolution time of 180 s. Additionally, the average dissolution rate of lime in different slags shows an initial increase followed by a subsequent decrease. Among the slag studied, the highest average dissolution rate is in slag A3 at 2.24 × 10−6 m s−1, while the lowest rate is in slag A4 at 1.49 × 10−6 m s−1. The presence of the 2CaO·SiO2 layer hinders the mass transfer, thereby further inhibiting the reaction.

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“…At present, Magang sintering layer thickness can reach 900 mm, 18) and the sintering layer thickness of Baosteel and Shougang Jingtang steel can reach 800 mm. 19,20) According to statistical data of SiO 2 content of sinter used in Chinese super-large blast furnaces in 2013, Baosteel and Tisco were less than 5%, the rest were mainly concentrated in 5.0-5.5% except for Wisco (average SiO 2 content of sinter was higher than 6.0%).…”

Section: Low Sio 2 Content and High Reducibility Sintermentioning

confidence: 99%

Low Carbon Operation of Super-Large Blast Furnaces in China

2015

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There are 19 super-large blast furnaces more than 4 000 m 3 running in China currently, and significant progresses of low carbon operation were obtained in recent years. In this paper, low carbon operation technologies of Chinese super-large blast furnaces were illustrated in the two aspects of raw materials preparation and blast furnace operation. Firstly in terms of raw materials preparation, low carbon operation technologies include producing low SiO 2 content and high reducibility sinter to reduce slag volume and improve sinter metallurgical properties; optimizing coal blending structure for coking to guarantee coke quality; implementing blending yard technology to stabilize blast furnace operation; controlling harmful elements load to reduce their damage to coke; adopting screening technology to reduce dust amount; recycling small size sinter, nut coke and CDQ dust to improve ironmaking energy efficiency. Secondly in terms of blast furnace operation, low carbon operation technologies include improving gas utilization efficiency by upper adjustment and lower adjustment, the upper adjustment including charging mode, batch weight and stock line level, lower adjustment including the control of blast volume and blast kinetic energy; implementing comprehensive blast technology of high blast temperature, dehumidified blast and high top pressure, promoting economic coal injection concept; conducting low silicon smelting, but should pay attention to its impact on campaign life of blast furnace; controlling thermal load to reduce heat loss, emphasizing middle-part management of blast furnace; development and application of blast furnace visualization technology to guarantee long-term smooth operation of blast furnace.KEY WORDS: super-large blast furnace; low carbon operation; fuel rate; gas utilization efficiency; economic coal injection; blast furnace visualization technology.

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Limestone dissolution and decomposition in steelmaking slag

Cited by 9 publications

References 17 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

Evolution of Interface Characteristic between Quicklime and CaO–SiO₂–Fe_tO–MgO Melt during Slag‐Forming Procedure in Converter under Different Times

Low Carbon Operation of Super-Large Blast Furnaces in China

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Limestone dissolution and decomposition in steelmaking slag

Cited by 9 publications

References 17 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

Evolution of Interface Characteristic between Quicklime and CaO–SiO2–FetO–MgO Melt during Slag‐Forming Procedure in Converter under Different Times

Low Carbon Operation of Super-Large Blast Furnaces in China

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Evolution of Interface Characteristic between Quicklime and CaO–SiO₂–Fe_tO–MgO Melt during Slag‐Forming Procedure in Converter under Different Times