Role and Enhancement Mechanism of Carbon Deposition in the Low‐Temperature CO Reduction of Bayan Obo Iron Concentrate Pellets
低温CO還元における炭素析出の役割と促進機構：バヤンオボ鉄精鉱ペレットの事例 (AI 翻訳)
Min Li, Fang Zhang, Jun Peng, Yongbin Wang, Hongtao Chang, Fan Yang, Qiushi Cui
🤖 gxceed AI 要約
日本語
本研究では、直接還元鉄（DRI）製造プロセスにおける低温CO還元時の炭素析出挙動を、熱天秤を用いて調査した。600°Cでは厚さ約2mmの炭素析出層が形成され、700°Cでは還元率90.53%を達成、800°C以上では自由炭素が消失しFe3Cが生成する。これらの知見は、高炉代替としてのDRIプロセス最適化に寄与する。
English
This study investigates carbon deposition during low-temperature CO reduction of Bayan Obo iron concentrate pellets for DRI production. At 600°C, a 2mm carbon layer forms; at 700°C, reduction reaches 90.53% with a thinner carbon layer; above 800°C, free carbon disappears and Fe3C forms. These findings help optimize DRI processes to reduce steelmaking emissions.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の鉄鋼業はCO2排出削減が急務であり、DRIは高炉法に代わる有望な低炭素技術である。本論文は特定の鉱石に基づくが、低温還元プロセスの理解を深める点で、日本の製鉄所がDRI導入を検討する際の基礎データとなり得る。
In the global GX context
DRI is a key decarbonization pathway for global steel production, offering shorter routes with lower emissions. This paper provides experimental insights into carbon deposition behavior during low-temperature reduction, which can inform process optimization for reducing energy consumption and CO2 output in shaft furnace operations.
👥 読者別の含意
🔬研究者:Provides detailed experimental data on carbon deposition kinetics and iron carbide formation under low-temperature CO reduction.
📄 Abstract（原文）
The production of direct reduced iron (DRI) by reducing pellets in a shaft furnace is an important pathway to lower carbon emissions, replacing the conventional blast furnace–converter process with a shorter shaft furnace–electric furnace route. Low‐temperature CO reduction of Bayan Obo iron ore concentrate pellets was investigated using a thermogravimetric analyzer (TGA) to understand the role of carbon deposition. Thermodynamic results indicate that the decomposition reaction of CO (2CO → C+CO 2 ) predominates below 644°C. At 703°C, Fe 3 C forms via the reaction between CO and FeO, while at 814°C, it is generated by the direct reduction reaction (3Fe+C → Fe 3 C). Experimental findings show that after 6 h of reduction, a carbon deposition layer about 2 mm thick with evident stratification forms on the pellet surface at 600°C. At 700°C, the free carbon layer decreases to around 1 mm with an indistinct stratified structure, and the reduction degree reaches 90.53%, meeting shaft furnace smelting requirements. At 800°C, both free carbon and the stratified structure disappear, and a small amount of Fe 3 C is formed. The amount of Fe 3 C increases at 900°C, but it disappears at 1000°C, where the reduction degree reaches 97.01%.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1002/srin.202501287first seen 2026-07-15 05:00:38
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