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 ›› 2024, Vol. 56 ›› Issue (3): 98-104.doi: 10.19964/j.issn.1006-4990.2023-0421

• 环境·健康·安全 • 上一篇    下一篇

混合相磷石膏基胶结材制备与早期性能研究

王茹霆1,2(), 赵小蓉1,2,3, 黄绪泉1,2,3,4(), 王豪杰1,2,3, 薛菲1,2,3, 蔡家伟1,2   

  1. 1.三峡库区生态环境教育部工程研究中心, 湖北 宜昌 443002
    2.三峡大学水利与环境学院, 湖北 宜昌 443002
    3.固体废物处置与资源化利用宜昌市重点实验室, 湖北 宜昌 443002
    4.湖北省磷石膏资源化综合利用企校联合创新中心, 湖北 宜昌 443002
  • 收稿日期:2023-08-23 出版日期:2024-03-10 发布日期:2024-03-14
  • 通讯作者: 黄绪泉(1975— ),男,博士,副教授,主要研究方向为固体废物处置与资源化;E-mail:huangxuquan@126.com
  • 作者简介:王茹霆(1999— ),女,硕士,主要研究方向为固体废物处置与资源化;E-mail:1819373548@qq.com
  • 基金资助:
    三峡库区生态环境教育部工程研究中心开放基金课题项目(KF2022-11);宜昌市自然科学研究项目(A23-2-020)

Research on preparation and early performance of mixed phase phosphogypsum-based cementing materials

WANG Ruting1,2(), ZHAO Xiaorong1,2,3, HUANG Xuquan1,2,3,4(), WANG Haojie1,2,3, XUE Fei1,2,3, CAI Jiawei1,2   

  1. 1.Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,China
    2.College of Hydraulic & Environmental Engineering,China Three Gorges University,Yichang 443002,China
    3.Yichang Key Laboratory of Solid Waste Disposal and Resource Utilization,China Three Gorges University,Yichang 443002,China
    4.Hubei Province Enterprise-college Cooperation Innovation Center for Comprehensive Utilization of Phosphogypsum,Yichang 443002,China
  • Received:2023-08-23 Published:2024-03-10 Online:2024-03-14

摘要:

以混合相磷石膏为主要原料,掺入矿渣、赤泥、偏高岭土、熟料制备混合相磷石膏基胶结材,通过抗压强度、pH和浸出毒性测试研究其早期性能,采用X射线衍射(XRD)、扫描电镜(SEM)和傅里叶变换红外光谱(FT-IR)测试分析水化机理。结果表明:53.76%(质量分数,下同)混合相磷石膏、9.68%矿渣、9.68%赤泥、16.13%偏高岭土和10.75%熟料可制备出性能最优的混合相磷石膏基胶结材,其3、5、7 d抗压强度分别达到8.93、10.99、13.14 MPa,pH碱性低于传统水泥基材料,总磷、氟化物浸出浓度均满足污水综合排放标准要求;磷石膏在400 ℃下煅烧60 min形成半水-无水混合相磷石膏,其中半水石膏和无水石膏的相对含量分别为31.7%和68.3%。混合相磷石膏基胶结材水化生成的水化硅酸钙凝胶、钙矾石和透钙磷石等物质形成致密结构,提升材料强度,阻隔污染物F-、PO43-浸出。混合相磷石膏基胶结材具有良好的力学性能和环境相容性,可为磷石膏规模化消纳提供新途径。

关键词: 磷石膏, 混合相, 胶结材, 浸出毒性, 微观结构

Abstract:

Mixed phase phosphogypsum was used as the main raw material,and slag,red mud,metakaolin and clinker were added to prepare mixed phase phosphogypsum-based cementing material.Its early performance was studied by compressive strength,pH and leaching toxicity tests,and the hydration mechanism was elaborated by X-ray diffraction(XRD),scanning electron microscope(SEM) and Fourier transform infrared spectroscopy(FT-IR) tests.The results showed that 53.76%(mass fraction,the same below) of mixed phase phosphogypsum,9.68% of slag,9.68% of red mud,16.13% of metakaolin and 10.75% of clinker could prepare the mixed phase phosphogypsum cementing material with optimized performance,and its compressive strength at the 3,5 d and 7 d were 8.93,10.99 MPa and 13.14 MPa respectively.Its pH alkalinity was lower than that of traditional cement-based materials,and the leaching concentration of PO43- and F- were lower than the limit of the integrated wastewater discharge standard.The results of microscopic analysis showed that phosphogypsum was calcined at 400 ℃ for 60 min to form hemihydrate-anhydrate mixed phase phosphogypsum,in which the relative contents of hemihydrate and anhydrate gypsum were 31.7% and 68.3% respectively.The hydrated calcium silicate gel,ettringite and brushite generated by hydration of mixed phase phosphogypsum-based cementing materials formed dense structures,which would improve the strength of materials and block the leaching of pollutants.The mixed phase phosphogypsum-based cementing material had good mechanical properties and environmental compatibility,which provided a new potential way for the large-scale consumption of phosphogypsum.

Key words: phosphogypsum, mixed phase, cementing material, leaching toxicity, micro structure

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