摘要
钢铁冶金渣湿法碳酸化封存CO_(2)作为新兴的碳捕集与封存技术(CCUS),因其原料资源化利用与碳封存的双重效益展现出显著的经济价值。本文探讨时间、温度及CO_(2)气流流量对Ca^(2+)萃取液碳酸化效率的影响规律,结合反应动力学模型解析其限制性环节;通过SEM与X射线衍射(XRD)表征产物的形貌特征。试验结果表明:随着温度和时间的增加,碳酸化程度呈现出先增大后减少的趋势;而随着气流量的增大,碳酸化程度先减小后增大。在CO_(2)气流流量为0.1 L/min、温度为60℃的最佳条件下反应22.5 min,此时碳酸化率为68.03%。结合阿伦尼乌斯方程,计算表观活化能为24.45 kJ/mol,说明该反应体系受表面化学反应与气液边界层扩散双重控制。产物表征显示合成碳酸钙的纯度达99.37%,并且其晶形结构主要为稳定的方解石与球霰石,碳酸钙产品<0.075 mm粒级占比为93.6%,符合工业沉淀碳酸钙(PCC)质量标准,可广泛应用于造纸、塑料及建筑材料领域。本研究可为冶金固废协同碳封存技术提供关键工艺参数与理论支撑。
As an emerging carbon capture and storage(CCUS)technology,wet carbonation and storage of CO_(2) from ferrous metallurgical slag has shown significant economic value due to its dual benefits of raw material resource utilization and carbon storage.This paper discusses the influence of time,temperature and CO_(2) airflow flow on the carbonation efficiency of Ca^(2+)extract,and analyzes its restrictive links in combination with the reaction kinetic model;the morphological characteristics of the product are characterized by SEM and X-ray diffraction(XRD).The experimental data show that with the increase of temperature and time,the degree of carbonation first increases and then decreases.With the increase of gas flow,the degree of carbonation decreases first and then increases.The optimal reaction conditions are 22.5 min at a CO_(2) gas flow rate of 0.1 L/min and a temperature of 60℃,and the carbonation rate is 68.03%.Combined with the Arrhenius equation,the apparent activation energy is calculated as 24.45 kJ/mol,which indicates that the reaction system is controlled by both surface chemical reaction and gas-liquid boundary layer diffusion.The product characterization shows that the purity of the synthetic calcium carbonate is 99.37%,and its crystal structure is mainly stable calcite and aragonite,and the proportion of calcium carbonate products<0.075 mm fraction is 93.6%,which meets the quality standards of industrial precipitated calcium carbonate(PCC)and could be widely used in papermaking,plastics and building materials.This study can provide key process parameters and theoretical support for synergistic carbon storage technology of metallurgical solid waste.
作者
李彦军
刘陈新
曹朝真
张雨晨
曹明汇
焦克新
徐润生
LI Yanjun;LIU Chenxin;CAO Chaozhen;ZHANG Yuchen;CAO Minghui;JIAO Kexin;XU Runsheng(Chengde Branch of HBIS Group Co.,Ltd.,Chengde 050000,Heibei,China;BHP Billiton Ltd.,Beijing 100081,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《烧结球团》
北大核心
2025年第3期141-148,共8页
Sintering and Pelletizing
基金
国家自然科学基金资助项目(52274316&U24A20102)
国家重点研发计划资助项目(2024YFE0208900&2022YFE0208100)
新疆维吾尔自治区重大科技专项(2022A01003)
山西省科技重大专项计划“揭榜挂帅”项目(202201050201011)
安徽省重点研究与开发计划资助项目(202210700037)。
关键词
封存CO_(2)
钢渣
氯化铵
碳酸钙
CO_(2)storage
steel slag
ammonium chloride
calcium carbonate
