以气态硫磺还原磷石膏作全钙源制备贝利特硫铝酸盐水泥
作者:
作者单位:

西安建筑科技大学 材料科学与工程学院,陕西 西安 710055

作者简介:

陈延信(1974—),男,安徽合肥人,西安建筑科技大学教授,博士生导师,博士. E-mail: yx_ch@126.com

通讯作者:

陈延信(1974—),男,安徽合肥人,西安建筑科技大学教授,博士生导师,博士. E-mail: yx_ch@126.com

中图分类号:

TQ172.4

基金项目:

“十三五”国家重点研发计划项目(2016YFB0303400, 2017YFB0309903-03);陕西省重点研发计划项目(2020GY-260, 2021GY-203);陕西省教育厅重点科研项目(20JS079, 20JY040);陕西省科技创新团队(2021TD-53)


Preparation of Belite Sulfoaluminate Cement Using Phosphogypsum Reduced by Gaseous Sulphur as Sole Calcium Oxide Source
Author:
Affiliation:

College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

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    摘要:

    以气态硫磺还原磷石膏(PG)作为全钙源,采用分段煅烧制度制备了贝利特硫铝酸盐水泥,并采用X射线衍射仪、傅里叶红外光谱仪等研究了其矿物相组成与水化性能.结果表明:贝利特硫铝酸盐水泥的主要矿物相为Ca4Al6(SO4)O12(C4A3S¯)、Ca2SiO4(β-C2S)和Ca8Fe4Al4O20(C4AF),同时含有少量的钙铝黄长石(C2AS)和alpha'-Ca2SiO4·0.05Ca3(PO42(α'-C2S);随着煅烧温度和煅烧时间的增加,C4A3S¯的含量增加,但煅烧温度超过1 300 ℃,煅烧时间超过90 min后会对C4A3S¯的形成产生不利的影响;过度煅烧熟料各龄期的强度都会降低,对其早期强度的发展产生了不利的影响,但对其后期强度的发展有利.

    Abstract:

    Belite sulfoaluminate cement was prepared by the segmental calcination system using phosphogypsum (PG) reduced by sulfur gas as the sole calcium oxide source. The mineral phase composition and hydration properties were studied by X-ray differaction and Fourier infrared spectrum. The results show that main mineral phases of the clinker are Ca4Al6(SO4)O12(C4A3S¯),Ca2SiO4(β-C2S) and Ca8Fe4Al4O20(C4AF), with small amounts of gehlenite(C2AS) and alpha'-Ca2SiO4·0.05Ca3(PO42(α'-C2S). When the calcination temperature and calcination time are increased, the content of C4A3S¯ increases. However, above 1 300 °C and 90 min, the formation of C4A3S¯ is adversely affected. Excessive calcination will reduce the strength of the clinker at each age, which is disadvantageous for its early strength development and is beneficial to its later strength development.

    表 6 在1 300 ℃下煅烧不同时间的贝利特硫铝酸盐水泥熟料中的游离CaO含量Table 6 Free CaO content in belite sulfoaluminate cement clinkers at different times at 1 300 °C
    表 3 煅烧制度Table 3 Calcination regimes
    图1 不同煅烧制度制备的贝利特硫铝酸盐水泥熟料的XRD图谱Fig.1 XRD patterns of belite sulfoaluminate cement clinkers prepared by different calcination systems
    图2 不同煅烧温度煅烧90 min的贝利特硫铝酸盐水泥熟料的NMR图谱Fig.2 NMR patterns of belite sulfoaluminate cement clinkers calcined at different calcination temperatures for 90 min
    图3 不同煅烧温度下煅烧90 min的贝利特硫铝酸盐水泥熟料的FTIR图谱Fig.3 FTIR spectra of belite sulfoaluminate cement clinkers at different calcination temperatures for 90 min
    图4 不同煅烧温度下煅烧90 min的贝利特硫铝酸盐水泥水化产物的XRD图谱Fig.4 XRD patterns of the hydration products of belite sulfoaluminate cements calcined at different calcination temperatures for 90 min
    图5 1 300 ℃下煅烧不同时间的贝利特硫铝酸盐水泥产物的XRD图谱Fig.5 XRD patterns of the hydration products of belite sulfoaluminate cements calcined at 1 300 °C for different time
    图6 不同煅烧温度煅烧90 min的贝利特硫铝酸盐水泥水化产物的FTIR图谱Fig.6 FTIR spectra of the hydration products of belite sulfoaluminate cements calcined at different calcination temperatures for 90 min
    图7 1 300 ℃下煅烧90 min的贝利特硫铝酸盐水泥水化1、3 、7、28 d的TG-DSC曲线Fig.7 TG-DSC curves of hydration of 1, 3, 7, 28 d hydration of belite sulfoaluminate cement calcined at 1 300 °C for 90 min
    图8 不同煅烧制度下水泥净浆的抗压强度Fig.8 Compressive strength of cement pastes under different calcination systems
    表 1 原材料的化学组成Table 1 Chemical compositions of raw materials
    表 2 生料的配合比Table 2 Proportion of raw meal
    表 5 不同煅烧温度下煅烧90 min的贝利特硫铝酸盐水泥熟料中游离CaO的含量Table 5 Free CaO contents in belite sulfoaluminate cement clinkers at different temperatures for 90 min
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陈延信,苏嘉豪,赵博,宋强,聂娇.以气态硫磺还原磷石膏作全钙源制备贝利特硫铝酸盐水泥[J].建筑材料学报,2023,26(12):1292-1302

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  • 收稿日期:2022-12-27
  • 最后修改日期:2023-02-12
  • 在线发布日期: 2024-01-08
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