无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2025, Vol. 57 ›› Issue (10): 111-118.doi: 10.19964/j.issn.1006-4990.2024-0606

• 环境·健康·安全 • 上一篇    下一篇

钢渣优化石粉源钙基CO2吸附剂循环稳定性研究

彭兴华1,2,3(), 李国栋1,2,3, 谭靖1,2,3, 尤大海1,2,3, 张朝宏1,2,3, 张晋1,2,3, 张立1,2,3   

  1. 1.湖北冶金地质研究所(中南冶金地质研究所),湖北 宜昌 443000
    2.湖北省矿物材料及应用工程技术研究中心,湖北 宜昌 443000
    3.矿产资源综合利用宜昌市重点实验室,湖北 宜昌 443000
  • 收稿日期:2024-11-16 出版日期:2025-10-10 发布日期:2025-03-06
  • 作者简介:彭兴华(1987— ),男,硕士,助理研究员,主要研究方向为固废综合利用和CO2吸附剂的制备与性能优化;E-mail:wky1008pxh@163.com
  • 基金资助:
    宜昌市自然科学基金项目(A23-2-043)

Study on steel slag optimized cycle stability of calcium-based CO2 adsorbent from stone powder

PENG Xinghua1,2,3(), LI Guodong1,2,3, TAN Jing1,2,3, YOU Dahai1,2,3, ZHANG Chaohong1,2,3, ZHANG Jin1,2,3, ZHANG Li1,2,3   

  1. 1. Hubei Institute of Metallurgical Geology(Central South Institute of Metallurgical Geology),Yichang 443000,China
    2. Hubei Provincial Research Center of Mineral Materials and Applied Engineering Technologies,Yichang 443000,China
    3. Yichang Key Laboratory of Comprehensive Utilization of Mineral Resources,Yichang 443000,China
  • Received:2024-11-16 Published:2025-10-10 Online:2025-03-06

摘要:

循环稳定性差是制约钙基CO2吸附剂发展应用的主要瓶颈。以石粉和钢渣制备前驱体,运用响应曲面法确定前驱体制备吸附剂的适宜条件,并通过钙循环实验和SEM、XRD、BET检测,研究了钢渣对吸附剂循环稳定性的影响和机理。结果表明:制备吸附剂的优化条件是煅烧温度为860 ℃,煅烧时间为95 min,空气气氛,石粉、钢渣、水泥质量比为90:7:3,此时吸附剂有效分解值为94.06%;掺入钢渣的吸附剂经过35次钙循环后(GX35),CO2吸附量和碳酸化转化率分别为0.426 1 g/g和78.60%,优于未掺入钢渣的吸附剂经过20次钙循环后(SX20)的CO2捕集性能;GX35中含有较多的1~3 nm孔隙,呈疏松海绵状,而SX20中5 nm以下孔隙极少,呈致密团块状;掺入钢渣的吸附剂在钙循环过程中,晶粒生长和孔隙结构变化幅度均小于未掺入钢渣的吸附剂。钢渣可发挥加快分解、阻挡分隔、分散限域、骨架支撑和成核作用,抑制晶粒聚集和颗粒团聚,降低孔结构坍塌和堵塞幅度,增强吸附剂抗烧结能力和循环稳定性。

关键词: 钙基CO2吸附剂, 循环稳定性, 钢渣, 石粉, 烧结

Abstract:

Poor cycling stability is the main bottleneck restricting the development and application of calcium-based CO2 adsorbent.The precursors were prepared from stone powder and steel slag,and the optimum conditions for preparing adsorbent were determined by response surface method.The influence and mechanism of steel slag on the cyclic stability of the adsorbent were studied by calcium cycle testing and SEM,XRD,BET detection.The results showed that the optimum conditions for preparation of the adsorbent were calcination temperature of 860 ℃,calcination time of 95 min,in an air atmosphere,mass ratio of stone powder,steel slag and cement 90:7:3,and at this time the effective decomposition value of the adsorbent was 94.06%.After 35 calcium cycles(GX35),the CO2 adsorption capacity and carbonation conversion rate of the adsorbent with steel slag were 0.426 1 g/g and 78.60%,respectively,which were better than the CO2 capture performance of the adsorbent without steel slag after 20 calcium cycles(SX20).GX35 contained a relatively large number of pores with diameters ranging from 1 nm to 3 nm and it had a loose sponge-like structure overall,while SX20 contained few pores with diameters below 5 nm and it had a tight structure.The adsorbent with steel slag showed a smaller change in crystal growth and pore structure during the calcium cycle compared to the adsorbent without steel slag.Steel slag could play the role of accelerate decomposition,block separation,disperse limiting,skeleton support and nucleation,inhibited crystal aggregation and particle agglomeration,and reduced pore structure collapse and plugging amplitude,and enhanced the anti-sintering ability and cycle stability of the adsorbent.

Key words: calcium-based CO2 absorbent, cycle stability, steel slag, stone powder, sintering

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