Wang Ya-Jun, Li Jun-Guo, Tao Meng-Jie, Zhang Xi, Zhang Jian-Bao, Qin Song, Liu Shao-Hua, Peng Li-Jie, Zhang Xiao-Pei, Zeng Ya-Nan
College of Metallurgy and Energy, North China University of Science and Technology, 21 Bohai Street, Tangshan 063210, China.
College of Metallurgy and Energy, North China University of Science and Technology, 21 Bohai Street, Tangshan 063210, China.
Sci Total Environ. 2023 Dec 15;904:166750. doi: 10.1016/j.scitotenv.2023.166750. Epub 2023 Sep 1.
This study presents a novel method for producing acicular aragonite using argon oxygen decarburization (AOD) slag while controlling the reaction temperature, reaction time, stirring speed, and the magnesium-to‑calcium stoichiometric ratio. This approach provides steel plants with an opportunity to decrease their CO emissions and promote efficient resource utilization and CO storage through the production of high-quality value-added products. The experimental results showed that reaction temperature was the most significant factor affecting the carbonation efficiency of AOD slag, followed by reaction time, stirring speed, CO partial pressure, and the liquid-to-solid ratio (L/S). The study also found that elevated temperature and prolonged reaction duration favored the preferential precipitation of aragonite. Additionally, raising the temperature and the magnesium-to‑calcium stoichiometric ratio was shown to enhance the formation of aragonite, affecting its crystal growth orientation and dimensions. The optimal combination of reaction parameters for the preparation of acicular aragonite was found to be the reaction time of 8 h, the magnesium-to‑calcium stoichiometric ratio of 0.8, the reaction temperature of 120 °C, and the stirring speed of 200 r·min. Under these conditions, the resulting acicular aragonite exhibited excellent overall uniformity, a large aspect ratio, and a smooth crystal surface, with a content of 91.49 %, a single crystal length ranging from 9.86 to 32.6 μm, and a diameter ranging from 0.63 to 2.15 μm. This study provides valuable insights into the efficient production of acicular aragonite from steel slag while reducing CO emissions and promoting the sustainable use of resources.
本研究提出了一种利用氩氧脱碳（AOD）炉渣生产针状文石的新方法，同时控制反应温度、反应时间、搅拌速度以及镁钙化学计量比。这种方法为钢铁厂提供了一个机会，通过生产高质量的增值产品来减少其二氧化碳排放，并促进资源的高效利用和二氧化碳封存。实验结果表明，反应温度是影响AOD炉渣碳酸化效率的最显著因素，其次是反应时间、搅拌速度、二氧化碳分压和液固比（L/S）。该研究还发现，升高温度和延长反应持续时间有利于文石的优先沉淀。此外，提高温度和镁钙化学计量比可增强文石的形成，影响其晶体生长取向和尺寸。制备针状文石的反应参数的最佳组合为反应时间8小时、镁钙化学计量比0.8、反应温度120℃和搅拌速度200r·min。在这些条件下，所得针状文石表现出优异的整体均匀性、较大的长径比和光滑的晶体表面，含量为91.49%，单晶长度范围为9.86至32.6μm，直径范围为0.63至2.15μm。本研究为从钢渣中高效生产针状文石提供了有价值的见解，同时减少了二氧化碳排放并促进了资源的可持续利用。
