Sulfide Capacities of Solid Oxides in Calcium-Aluminate Systems

Baba, Yuya; Gao, Xu; Ueda, Shigeru; Kitamura, Shin Ya

doi:10.2355/isijinternational.isijint-2019-793

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…1. Although the present results were slightly lower than those by Baba et al, 5) it was confirmed that solid C12A7(O, S) had higher C S 2− than the liquid with the corresponding composition, even when C S 2− decreased with increasing sulfur concentration.…”

Section: Resultscontrasting

confidence: 79%

“…Figure 2 shows the CaO-Al 2 O 3 binary phase diagram; Ca 12 Al 14 O 33 is the compound with CaO/Al 2 O 3 = 12/7 and melts congruently at about 1 688 K. 4) Ca 12 Al 14 O 33 was reported as a solid oxide that exhibited high sulfide capacity. 5) The reported values for C S 2− at lower temperatures than the melting point are also given in Fig. 1.…”

Section: Introductionmentioning

confidence: 94%

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Chemical Reaction between Inclusion Compound of Ca12Al14O33 and Sulfur in Gas Phase

et al. 2023

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where (i) slag denotes anion i in slag, K 1 represents the apparent equilibrium constant of Reaction (1), f S 2− and (%S 2 − ) are the activity coefficient and mass% concentration of S 2 − , respectively, and a O 2− is the activity of O 2 − . According to Eq. ( 3), the value for C S 2− increases in the conditions that slag basicity is high, i.e., a O 2− is high, and slag contains components with high chemical affinity for sulfur, i.e., f S 2−

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Section: Resultscontrasting

confidence: 79%

Section: Introductionmentioning

confidence: 94%

Chemical Reaction between Inclusion Compound of Ca12Al14O33 and Sulfur in Gas Phase

et al. 2023

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“…[22] Baba brought this study further into the metal-slag system. [23] Their study verified that the formation of CaS around 12CaO•7Al 2 O 3 particles was suppressed by the diffusion of sulfur in the solid oxide. However, the effect of Al on the formation of CaS during the solid reaction between Al-killed steels and calcium aluminate inclusions was rarely reported.…”

Section: Introductionmentioning

confidence: 85%

Effect of Al on the Solid Reaction between 3CaO·Al₂O₃ Oxide and Fe–S–O–Al Alloy at 1373 K

Wang

Zhang

Ren

et al. 2021

steel research int.

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Diffusion couples of 3CaO•Al 2 O 3 and Fe-S-O-(Al) alloys are prepared to investigate the transformation of calcium aluminate reacting with solid sulfurcontaining alloys. Diffusion behaviors and solid reaction between the alloy phase and the slag phase under 1373 K are studied. Product layers of 12CaO•7Al 2 O 3 and CaS are formed at the interface. After heating for 10 h, the average thickness of CaS layer in samples with and without Al in the alloy phase is 2.10 and 0.71 μm, respectively, while it increases to 3.76 and 1.75 μm after 50 h heating. Aluminum in the alloy makes the solid reaction at the interface easier to happen, meanwhile inhibits the formation of CaS layer by promoting the formation of 12CaO•7Al 2 O 3 layer and suppresses the diffusion of sulfur.

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“…The first one is the high-volume sulfur phase. According to the research by Baba et al [36], C3A possesses a higher sulfur capacity than C 12 A 7 , leading to an increase in Ls as the C 3 A content rises. However, despite A20 having the highest ratio of C 3 A phase, its Ls does not match that of A10 and A15, pointing to the second factor, which is the saturation of CaO precipitation.…”

Section: Analysis Of the Sulfur-tolerant Phasementioning

confidence: 99%

Effects of Different CaO/Al2O3 Ratios on the Phase Composition and Desulfurization Ability of CaO-Based Desulfurizers in Hot Metal

Shen,

Lin,

Chang

et al. 2024

Metals

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In response to the development of low-carbon smelting technology, reducing the use of fluor-containing materials in desulfurizers is an important research topic. The development of new-generation KR (Kambara Reactor) desulfurizers is shifting towards a higher Al2O3 content rather than CaF2, yet there is currently an absence of thorough and comprehensive mechanisms for desulfurization. Consequently, this research provides an extensive comparison using a specially constructed small-scale KR desulfurization hot model test, alongside FactSage simulation and SEM analysis (of desulfurization process). The findings indicate that at 1400 °C, for the desulfurization of molten iron, the capacity for desulfurization initially increases and then diminishes as the Al2O3 content in the KR desulfurizer rises. With Al2O3 content in the desulfurizer below 22 wt.%, the phase composition predominantly consists of C3A, employing a solid(slag)–liquid(metal) diffusion method for desulfurization. The optimal desulfurization capacity (Ls: 64.1) is observed when the Al2O3 content is 15 wt.%, attributed to the simultaneous presence of CaO particle precipitation and C3A. However, as the Al2O3 content reaches 20 wt.%, all the oversaturated CaO integrates into C3A, leading to a reduction in Ls from 64.1 to 10.7, thereby diminishing the desulfurization capacity by approximately sixfold. When Al2O3 exceeds 22 wt.%, the phase composition transitions from the C3A to C12A7 phase, and the desulfurization approach shifts from solid(slag)–liquid(metal) to liquid(slag)–liquid(metal) diffusion, with Ls decreasing to 23.4. This reduction is due to C12A7’s lower sulfur capacity compared to C3A and the absence of saturated CaO particle precipitation. Therefore, for Al2O3 to effectively replace fluorite in KR desulfurizers, a higher presence of C3A phases and CaO particle precipitation are essential. The desulfurizer must contain over 65 wt.% CaO and maintain Al2O3 levels at 10~16.2 wt.%.

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Sulfide Capacities of Solid Oxides in Calcium-Aluminate Systems

Cited by 6 publications

References 18 publications

Chemical Reaction between Inclusion Compound of Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> and Sulfur in Gas Phase

Chemical Reaction between Inclusion Compound of Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> and Sulfur in Gas Phase

Effect of Al on the Solid Reaction between 3CaO·Al₂O₃ Oxide and Fe–S–O–Al Alloy at 1373 K

Effects of Different CaO/Al2O3 Ratios on the Phase Composition and Desulfurization Ability of CaO-Based Desulfurizers in Hot Metal

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Sulfide Capacities of Solid Oxides in Calcium-Aluminate Systems

Cited by 6 publications

References 18 publications

Chemical Reaction between Inclusion Compound of Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> and Sulfur in Gas Phase

Chemical Reaction between Inclusion Compound of Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub> and Sulfur in Gas Phase

Effect of Al on the Solid Reaction between 3CaO·Al2O3 Oxide and Fe–S–O–Al Alloy at 1373 K

Effects of Different CaO/Al2O3 Ratios on the Phase Composition and Desulfurization Ability of CaO-Based Desulfurizers in Hot Metal

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Effect of Al on the Solid Reaction between 3CaO·Al₂O₃ Oxide and Fe–S–O–Al Alloy at 1373 K