不锈钢渣碳化影响因素及其机理研究

摘要/Abstract

摘要： 为开发γ-C₂S不锈钢渣碳储存的潜力,最大限度地提高不锈钢渣的综合利用率。通过研究主要碳化参数(如液固比、成型压力、CO₂分压)对不锈钢渣碳化性能的影响规律来评估不锈钢渣的CO₂储存能力,以期能够提供更佳的不锈钢渣碳化过程。利用XRD、SEM/EDS、DSC/TG分析对不锈钢渣碳化产物组成及微观形貌进行表征,并探索其碳化机理。结果表明,较佳碳化参数为成型压力为2.50 MPa,液固比为10%,CO₂分压为0.3 MPa。较佳碳化条件下每千克不锈钢渣可固化储存CO₂气体约123.6 g。不锈钢渣碳化过程以γ-C₂S碳化反应为主,碳化产物中出现了片状、颗粒状的CaCO₃,随碳化时间延长,晶体逐渐长大为团簇状。因此,利用不锈钢渣储备碳及制备碳化制品是可行的。

关键词: 不锈钢渣, 碳储存, 碳化活性, 抗压强度, 碳化机理, CO₂分压

Abstract: This study aim to develop the carbon storage potential of γ-C₂S stainless steel slag, and to maximize the comprehensive utilization rate of stainless steel slag. The impacts of several key parameters, such as molding pressure, liquid-solid ratio, CO₂ partial pressure on the carbonation performance were studied, and the CO₂ storage capacity of stainless steel slag was evaluated, so that a better carbonation process of the stainless steel slag could be offered. The composition and microstructure of the carbide products of stainless steel slag were characterized by XRD, SEM/EDS, DSC/TG to explore the carbonation mechanism. The results show that the optimal carbonation parameters are as follows: liquid-solid ratio 10%, molding pressure of 2.50 MPa, and CO₂ partial pressure of 0.3 MPa. In above mentioned conditions, about 123.6 g of CO₂ is stored in every kilogram of stainless steel slag. The γ-C₂S carbonation is main reaction during the carbonation progress. Flake and granular CaCO₃ are first observed, and then they gradually grow into clusters over time. Therefore, the storage and preparation of carbonized products using stainless steel slag are practicable.

Key words: stainless steel slag, carbon storage, carbonation activity, compressive strength, carbonation mechanism, CO₂ partial pressure

中图分类号:

X753

吴春丽, 陈哲, 谢红波, 麦俊明, 夏勇. 不锈钢渣碳化影响因素及其机理研究[J]. 硅酸盐通报, 2022, 41(4): 1369-1379.

WU Chunli, CHEN Zhe, XIE Hongbo, MAI Junming, XIA Yong. Influencing Factors and Mechanism of Stainless Steel Slag Carbonation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(4): 1369-1379.

参考文献

[1] 钱春香,张霄,伊海赫.微生物提升钢渣胶凝材料安定性和强度的作用及机理[J].硅酸盐通报,2020,39(8):2363-2371.
QIAN C X, ZHANG X, YI H H. Effect and mechanism of microorganism to improve the stability and strength of steel slag cementitious material[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(8): 2363-2371 (in Chinese).
[2] 姚恒山,陈思佳,陈德伟,等.加速碳酸化条件下钢渣块体体积安定性的研究[J].硅酸盐通报,2020,39(1):187-193.
YAO H S, CHEN S J, CHEN D W, et al. Study on soundness of steel slag block under accelerated carbonation[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(1): 187-193 (in Chinese).
[3] 史迪,叶家元,张文生,等.钢渣碳化砖的碱激发-碳化协同作用机制[J].钢铁研究学报,2021,33(11):1127-1133.
SHI D, YE J Y, ZHANG W S, et al. Synergistic mechanisms of alkali-activation and carbonation of carbonated steel slag bricks[J]. Journal of Iron and Steel Research, 2021, 33(11): 1127-1133 (in Chinese).
[4] 叶家元,张文生,史迪,等.钢渣碳化砖的碱激发-碳化协同效应影响因素[J].硅酸盐学报,2019,47(11):1582-1592.
YE J Y, ZHANG W S, SHI D, et al. Synergistic effect of alkali-activation and carbonation on carbonated steel slag bricks[J]. Journal of the Chinese Ceramic Society, 2019, 47(11): 1582-1592 (in Chinese).
[5] 张永胜,苏依林,詹其伟.微生物矿化技术制备不锈钢渣砖[J].新型建筑材料,2019,46(10):48-50+83.
ZHANG Y S, SU Y L, ZHAN Q W. Preparation of stainless steel slag bricks by microbial mineralization technology[J]. New Building Materials, 2019, 46(10): 48-50+83 (in Chinese).
[6] 李奇男.微波辅助铵盐浸出不锈钢渣中的钙及其碳酸化研究[D].武汉:武汉科技大学,2017:11-12.
LI Q N. Investigation on the microwave assisted leaching of calcium in the stainless steel slag by ammonium salts and its carbonation process[D]. Wuhan: Wuhan University of Science and Technology, 2017: 11-12 (in Chinese).
[7] 吕岩,那贤昭,齐渊洪,等.不锈钢AOD渣粉尘控制及其工程性能[J].钢铁,2015,50(4):76-83.
LYU Y, NA X Z, QI Y H, et al. Dust control and engineering performance of stainless steel AOD slag[J]. Iron & Steel, 2015, 50(4): 76-83 (in Chinese).
[8] GUAN X M, LIU S H, FENG C H, et al. The hardening behavior of γ-C₂S binder using accelerated carbonation[J]. Construction and Building Materials, 2016, 114: 204-207.
[9] 穆元冬,雪高瑞,赵思雪,等.γ型硅酸二钙的碳化研究进展[J].硅酸盐学报,2017,45(8):1197-1203.
MU Y D, XUE G R, ZHAO S X, et al. Development of carbonation of γ-dicalcium silicate[J]. Journal of the Chinese Ceramic Society, 2017, 45(8): 1197-1203 (in Chinese).
[10] 周雄,钟旷楠,穆元冬,等.0-3型γ-C₂S压电复合材料的制备及性能研究[J].武汉理工大学学报,2018,40(4):9-13.
ZHOU X, ZHONG K N, MU Y D, et al. Preparation and properties of 0-3 γ-C₂S piezoelectric composite[J]. Journal of Wuhan University of Technology, 2018, 40(4): 9-13 (in Chinese).
[11] 刘松辉,管学茂,邱满,等.通过加速碳化激发γ-C₂S矿物的活性[J].硅酸盐学报,2016,44(5):658-662.
LIU S H, GUAN X M, QIU M, et al. Activation of γ-C₂S mineral by accelerated carbonation[J]. Journal of the Chinese Ceramic Society, 2016, 44(5): 658-662 (in Chinese).
[12] 朱明,雪高瑞,穆元冬.γ-C₂S和β-C₂S的碳化与水化活性研究[J].硅酸盐通报,2017,36(9):3036-3040+3052.
ZHU M, XUE G R, MU Y D. Carbonation and hydration activity of γ-C₂S and β-C₂S[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(9): 3036-3040+3052 (in Chinese).
[13] 明心昭,刘志超,王发洲,等.Al₂O₃掺杂对γ-C₂S碳化性能的影响[J].硅酸盐通报,2021,40(6):2003-2010.
MING X Z, LIU Z C, WANG F Z, et al. Effect of Al₂O₃ doping on carbonation performance of γ-C₂S[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(6): 2003-2010 (in Chinese).
[14] FANG Y F, LIU Z C, WANG Q H, et al. Strength development and products evolution of β-C₂S and γ-C₃S induced by accelerated carbonation curing[J]. Journal of Wuhan University of Technology-Mater Sci Ed, 2020, 35(6): 1053-1060.
[15] 邱满,管学茂,刘松辉,等.用工业原料制备自粉化低碳水泥[J].硅酸盐通报,2016,35(12):3948-3951+3963.
QIU M, GUAN X M, LIU S H, et al. Preparation of self-pulverized low-carbon cement by industrial raw materials[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(12): 3948-3951+3963 (in Chinese).
[16] 吴昊泽,丁亮,郑文军,等.钢渣制品的最佳碳化制度[J].粉煤灰,2011,23(2):24-26.
WU H Z, DING L, ZHENG W J, et al. Optimum carbonization system of steel slag product[J]. Coal Ash, 2011, 23(2): 24-26 (in Chinese).
[17] 罗乃将,朱宝贵,顾红霞,等.碳化养护制备高强钢渣砖的研究[J].新型建筑材料,2020,47(5):71-74.
LUO N J, ZHU B G, GU H X, et al. Study on the preparation of high strength steel slag brick by carbonation curing[J]. New Building Materials, 2020, 47(5): 71-74 (in Chinese).
[18] 李刚林.碳化钢渣制备墙地建材制品[D].济南:济南大学,2015:35-36.
LI G L. Using steel slag to prepare building materials by carbonation technology[D]. Jinan: University of Jinan, 2015: 35-36 (in Chinese).
[19] CHANG J, FANG Y F, SHANG X P. The role of β-C₂S and γ-C₂S in carbon capture and strength development[J]. Materials and Structures, 2016, 49(10): 4417-4424.
[20] 常钧,吴昊泽.钢渣碳化机理研究[J].硅酸盐学报,2010,38(7):1185-1190.
CHANG J, WU H Z. Study on carbonation mechanism of steel slag[J]. Journal of the Chinese Ceramic Society, 2010, 38(7): 1185-1190 (in Chinese).
[21] CHEN Z X, CHU S H, LEE Y S, et al. Coupling effect of γ-dicalcium silicate and slag on carbonation resistance of low carbon materials[J]. Journal of Cleaner Production, 2020, 262: 121385.
[22] 管学茂,刘松辉,张海波,等.低钙硅酸盐矿物碳化硬化性能研究进展[J].硅酸盐学报,2018,46(2):263-267.
GUAN X M, LIU S H, ZHANG H B, et al. Carbonation and hardening properties of low calcium silicates minerals-a short review[J]. Journal of the Chinese Ceramic Society, 2018, 46(2): 263-267 (in Chinese).
[23] 杨南如,岳文海.无机非金属材料图谱手册[M].武汉:武汉工业大学出版社,2000:286-287.
YANG N R, YUE W H. The handbook of inorganic metalloid materials atlas[M]. Wuhan: Wuhan University of Technology Press, 2000: 286-287 (in Chinese).