Rheological,Carbon Sequestration, and MechanicalProperties of Solid Waste-Based Carbon-Negative Backfill Materials:Effect of Reaction Temperature
石炭系固形廃棄物をベースとした炭素ネガティブ充填材のレオロジー特性、炭素固定量および力学特性に及ぼす反応温度の影響 (AI 翻訳)
Shihao Xing (22659505), Yuyang Xia (24378948), Meng Li (79487), Peng Huang (105814), Jixiong Zhang (5844656), Majid Sartaj (11355130), Zhibo Cui (4428277)
🤖 gxceed AI 要約
日本語
本研究は、石炭系固形廃棄物（CSW）を用いた炭素ネガティブ充填材について、反応温度（25～130℃）がレオロジー特性、炭酸固定量、力学特性に及ぼす影響を系統的に調査した。55℃で最大炭酸固定率5.23％、一軸圧縮強度7.08 MPaを達成。温度上昇に伴い降伏応力が増加し、85℃を超えるとポンプ圧送限界を超えることを明らかにした。これらの知見は、CSW充填材によるCO2固定プロセスの最適化に資する。
English
This study systematically investigates the effect of reaction temperature (25-130°C) on the rheological, carbon sequestration, and mechanical properties of coal-based solid waste (CSW) carbon-negative backfill materials. Maximum carbonation rate of 5.23% and UCS of 7.08 MPa were achieved at 55°C. Yield stress increases with temperature, exceeding industrial pumping limits above 85°C. Findings provide theoretical support for optimizing CO2 sequestration in CSW backfill.
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
日本では石炭火力発電所から排出される石炭灰等の有効利用とCO2削減が重要な課題であり、本研究成果は廃棄物充填による炭素固定技術の可能性を示すものとして、日本の鉱山や土木工事への応用が期待される。
In the global GX context
This paper contributes to global CCUS literature by demonstrating a waste-based carbon-negative backfill material, relevant for mining operations seeking to sequester CO2 while managing solid waste. Offers technical parameters for temperature optimization in industrial applications.
👥 読者別の含意
🔬研究者:Provides experimental data on temperature effects for carbonation of coal-based waste backfill, useful for modeling and optimization of CCUS processes.
🏢実務担当者:Offers key technical parameters (optimal temperature 55°C, pumping limits) for designing carbon-negative backfill operations in mining.
🏛政策担当者:Highlights the potential of solid waste utilization for carbon sequestration, supporting policies for waste-to-carbon solutions and CCUS in mining.
📄 Abstract（原文）
Utilizing coal-based solid waste (CSW) for carbon-negative backfill mining offers a promising pathway for CSW disposal and CO<sub>2</sub> sequestration. However, the influence of reaction temperature on the rheological, carbon sequestration, and mechanical properties of the CSW backfill material remains unclear. In this study, coal gangue, fly ash, slag, and cement were used, and a temperature-adjustable carbonation testing system was employed to prepare and carbonate the CSW backfill material. Experimental groups were tested at reaction temperatures from 25 to 130 °C. Through thermogravimetric analysis, rheological tests, unconfined compressive strength (UCS) tests, and microscopic characterization, the effects of reaction temperature on carbonation rate, rheological, and mechanical properties were studied. The results show that the rheological behavior conforms to the Herschel–Bulkley model, and the yield stress increases with reaction temperature due to accelerated hydration and moisture evaporation. Once the reaction temperature reaches 85 °C, the yield stress exceeds the industrial pumping limit. The maximum carbonation rate of 5.23% and UCS 7.08 MPa were attained at 55 °C. This is due to increased reactivity of alkaline minerals and accelerated hydration at higher reaction temperatures. These findings provide theoretical support and key technical parameters for the optimization and engineering application of the CO<sub>2</sub> sequestration process of CSW backfill material.
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