Hydrogen Dissolution in the CaF2–CaO–SiO2 System

Park, Jun Yong; Han, Jin Sou; Sohn, Il

doi:10.2355/isijinternational.51.1788

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…J-Y. Park, et al 29) is reported that the activation energy of hydrogen dissolution is 177 kJ, while the one in this study is 190 kJ which is in good agreement with the data of Park, et al The reaction mechanism of CH4 decomposition is evidently different between the graphite surface and the slag melt. The reaction in cooperation with slag melt must relate to the phenomena with the hydrogen dissolution into slag.…”

Section: Mechanism Of Ch4 Decomposition and Effect Ofsupporting

confidence: 82%

Kinetic Analysis of the Decomposition Reaction of CH4 Injecting into Molten Slag

Kashiwaya

Watanabe

2012

ISIJ Int.

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Utilization of heat of slag is key technology for the reduction of CO2 emission in steel industries. While hydrogen production is important for the society of aiming to the sustainable energy system, the green hydrogen must be produced for the actual CO2 reduction.In the present study, methane gas was injected into a molten slag and hydrogen was produced through the thermal decomposition reaction. CH4 = C + 2H2Kinetic analysis was performed using an graphite crucible both with empty and slag. The rate constants for the graphite crucible, kG and the slag, kS, were obtained separately.The rate constants for graphite surface and slag surface, kG and kS, respectively, are as follows:Using the obtained rate constants, the increase of the area of reaction surface during the CH4 injection was estimated. It was found that the slow soaking of the injecting lance could be utilized for the heat of molten slag. In addition, the slag shape can be a powder type through the injection of CH4.KEY WORDS: decomposition of CH4; kinetic analysis; rate constant; molten slag; injecting of methane.

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Section: Mechanism Of Ch4 Decomposition and Effect Ofsupporting

confidence: 82%

Kinetic Analysis of the Decomposition Reaction of CH4 Injecting into Molten Slag

Kashiwaya

Watanabe

2012

ISIJ Int.

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“…Thus, H 2 O can contribute to the silicate depolymerization or polymerization. These mechanisms have been substantiated by experimental correlations and spectroscopic investigations . The slags used in this study can be classified as moderately basic slags.…”

Section: Introductionmentioning

confidence: 58%

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Mohassab

Sohn

2014

steel research int.

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In an effort to develop a novel green ironmaking process with the potential of steelmaking in a single continuous process the chemistry of selected slag systems were investigated. The novel process uses gaseous fuels and reductants that help reduce energy consumption and minimize greenhouse gas emissions. Amongst the proposed reductants and fuels are H2, natural gas (NG), and coal gas (CG). In different ironmaking processes, the molten bath (iron–slag bath) is expected to be at equilibrium with gas atmospheres of mainly H2/H2O, and CO/CO2/H2/H2O corresponding to the use of H2 and NG/CG, respectively. CO/CO2 gas mixture was studied for comparison. Based on the FTIR‐RAS (reflection absorption spectroscopy) and Raman analyses, it is expected that H2O stabilizes the more polymerized silicates anions rather than the depolymerized monomers. For the investigated slag compositions, slags under H2 and NG/CG at 1550 °C had values of ψ = (Q0 + Q1)/(Q2 + Q3) (a measure of depolymerization) 75 and 55 less than slags under the CO/CO2 atmosphere. It was concluded that the higher the water content in the gas atmosphere the more polymerized the silicates in the slag. The results of this study will, for the first time, provide new insights into the slag chemistry under H2O containing atmospheres.

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“…(2) The Effect of the FeO t Content on the Slag Structure at Fixed CaO/SiO 2 Ratios Using FTIR Our previous work 55,56 showed that the dissolution of hydrogen in slag is affected by the degree of slag polymerization and the number of available reaction sites. This polymerization and slag networking effect was ascertained by FTIR and Raman spectroscopy, similarly to Mysen et al [47][48][49] and McMillan.…”

Section: Resultsmentioning

confidence: 99%

Effect of FeO_t Content and CaO/SiO₂ Ratio on Hydrogen Dissolution in CaF₂–CaO–SiO₂‐Based Welding Fluxes

Park

Park²,

Chang³

et al. 2012

J. Am. Ceram. Soc.

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The solubility of hydrogen in the CaF2–CaO–SiO2–FeOt slag system was studied to characterize the dependence of hydrogen dissolution behavior on the CaO/SiO2 ratio and the Fe3+/Fe2+ redox equilibrium at 1823 K. In an acidic slag composition, the dissolved hydrogen seems to exist as an incorporated hydroxyl, where the supplied water vapor reacts with the bridged oxygen (Oo) of the slag network. In a basic slag composition, hydrogen dissolves as a free hydroxyl in the molten slag by reacting with the free oxygen (O2−). Using FTIR (Fourier transform infrared) and Raman spectroscopy, the addition of FeOt depolymerized the slag structure in an acidic slag system, but polymerized the slag structure in a basic slag system as the FeOt content increased. Furthermore, the formation of γ‐ and δ‐FeO(OH) was controlled by the amount of Fe2O3 present in the flux and increased at higher concentrations of Fe2O3. At a fixed Fe2O3 content and with CaO/SiO2 ratios varying from 0.7 to 1.3, the hydrogen solubility curve was parabolic as a function of CaO/SiO2, with a minimum near the CaO/SiO2 ratio of 1.0 and rapidly increasing at CaO/SiO2 ratios above 1.0.

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Hydrogen Dissolution in the CaF2–CaO–SiO2 System

Cited by 6 publications

References 25 publications

Kinetic Analysis of the Decomposition Reaction of CH4 Injecting into Molten Slag

Kinetic Analysis of the Decomposition Reaction of CH4 Injecting into Molten Slag

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Effect of FeO_t Content and CaO/SiO₂ Ratio on Hydrogen Dissolution in CaF₂–CaO–SiO₂‐Based Welding Fluxes

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Hydrogen Dissolution in the CaF2–CaO–SiO2 System

Cited by 6 publications

References 25 publications

Kinetic Analysis of the Decomposition Reaction of CH4 Injecting into Molten Slag

Kinetic Analysis of the Decomposition Reaction of CH4 Injecting into Molten Slag

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H2H2OCOCO2 Mixtures Relevant to a Novel Green Ironmaking Technology

Effect of FeOt Content and CaO/SiO2 Ratio on Hydrogen Dissolution in CaF2–CaO–SiO2‐Based Welding Fluxes

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Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Effect of FeO_t Content and CaO/SiO₂ Ratio on Hydrogen Dissolution in CaF₂–CaO–SiO₂‐Based Welding Fluxes