磷酸刻蚀钢渣的形貌及矿物特性
作者:
作者单位:

1.东南大学 材料科学与工程学院,江苏 南京 211189;2.东南大学 江苏省土木工程材料重点 实验室,江苏 南京 211189;3.淮阴工学院 建筑工程学院,江苏 淮安 223001;4.淮安市 博彦土木工程科学研究院有限公司,江苏 淮安 223001;5.中国矿业大学(北京) 化学与环境工程学院,北京 100083

作者简介:

霍彬彬(1991—),男,江苏连云港人,东南大学博士生. E-mail: huobinbin@seu.edu.cn

通讯作者:

张亚梅(1968—),女,江苏如皋人,东南大学教授,博士生导师,博士. E-mail: ymzhang@seu.edu.cn

中图分类号:

TU528.01

基金项目:

国家自然科学基金资助项目(51778132,51972057);江苏省333工程项目(BRA2020221)


Morphological and Mineralogical Characteristics of Phosphoric Acid Etched Steel Slag
Author:
Affiliation:

1.School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;2.Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China;3.Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai'an 223001, China;4.Huai'an Boyan Civil Engineering Research Institute Co., Ltd., Huai'an 223001, China;5.School of Chemical and Environmental Engineering, China University of Mining and Technology(Bejing), Beijing 100083, China

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    摘要:

    为探究经磷酸刻蚀后钢渣粉比表面积增大及水化活性提高的根源,采用放电等离子体烧结法制备了致密钢渣片并进行了抛光,研究了其被磷酸刻蚀不同时间后的形貌及矿物特性.结果表明:经磷酸刻蚀后,钢渣表面出现片状产物团聚而成的磷酸钙刻蚀产物;随着刻蚀时间的延长,磷酸钙覆盖面积逐渐增大,刻蚀至30 s后覆盖面积增加减缓;磷酸钙优先覆盖区域为硅酸钙和Ca-Al-Mg-Si-O相,而RO相则至30 s后才被磷酸钙大量覆盖;钢渣中的硅酸钙表面出现裂纹;磷酸钙的生成和硅酸钙相中裂纹的出现可以显著提高钢渣表面粗糙度.

    Abstract:

    To find out the reasons for the improved specific surface area and hydraulic reactivity of phosphoric acid etched steel slag powder, a dense and polished steel slag surface was prepared by spark plasma sintering system, and then morphology and mineralogy of phosphoric acid anhydrous solution(PAA) etched steel slag were comprehensively investigated. It is found that lumpy calcium phosphate composed of plate-like etched products clinged to the steel slag surface is detected. With increasing etching time, the area covered by calcium phosphate increases significantly before 30 s and slows down after that time, and the area of calcium silicates and Ca-Al-Mg-Si-O phases is preferentially covered than RO phases before 30 s. Additionally, cracks appear on the surface of calcium silicates. The produced calcium phosphate and cracks of calcium silicate result in the improved roughness of PAA etched steel slag.

    表 2 图8中反应物相的EDX分析Table 2 EDX analysis of reacted phase in the area in Fig. 8
    表 1 图7中刻蚀产物EDX分析Table 1 EDX analysis of etching product in the area in Fig. 7
    图1 PAA溶液刻蚀钢渣示意图Fig.1 Schematic diagram of PAA solution etching steel slag
    图2 抛光后致密钢渣片表面物相分析Fig.2 Phases analysis of polished dense steel slag surface
    图3 不同刻蚀时间下钢渣片表面BSE图Fig.3 BSE images of etched steel slag surfaces at different etching times
    图4 不同刻蚀时间下钢渣片表面各物相面积比Fig.4 Area ratio of steel slag surfaces at different etching times
    图5 钢渣片表面粗糙度变化Fig.5 Roughness change of steel slag surface
    图6 钢渣片表面物相变化Fig.6 Phase change of steel slag surface
    图7 刻蚀产物SEM图Fig.7 SEM images of etching product
    图8 磷酸刻蚀钢渣片反应物相SEM图Fig.8 SEM images of reacted phases in PAA solution etched steel slag surface
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霍彬彬,李保亮,罗阳林,张亚梅,王栋民.磷酸刻蚀钢渣的形貌及矿物特性[J].建筑材料学报,2022,25(6):591-597

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  • 收稿日期:2021-04-22
  • 最后修改日期:2021-07-07
  • 在线发布日期: 2022-08-01
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