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Influences of Friedel's Salt Produced by CaO-Activated Titanium-Extracted Tailing Slag on Chloride Binding.
Tang, Song; Peng, Tongjiang; Sun, Hongjuan; Ding, Wenjin; Luo, Liming; You, Hao; Yao, Xiaoman.
Afiliación
  • Tang S; School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China.
  • Peng T; Institute of Mineral Materials and Application, Southwest University of Science and Technology, Mianyang 621010, China.
  • Sun H; School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China.
  • Ding W; Institute of Mineral Materials and Application, Southwest University of Science and Technology, Mianyang 621010, China.
  • Luo L; Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Mianyang 621010, China.
  • You H; School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China.
  • Yao X; Institute of Mineral Materials and Application, Southwest University of Science and Technology, Mianyang 621010, China.
Materials (Basel) ; 16(7)2023 Apr 03.
Article en En | MEDLINE | ID: mdl-37049137
Titanium-extracted tailing slag (TETS) has high activity, but the content of chloride ions is high. To effectively bind the chloride ions, CaO was used to activate the TETS, and the solidified cementitious material of CaO-activated TETS was prepared. The effects of CaO content and curing age on the strength of solidified samples, chloride binding capacity, and chloride binding mechanism were studied. By means of XRD, FTIR, SEM, and EDS, the hydration reaction products, microstructure, morphology, and micro-components of the solidified sample were characterized. The results show that the chloride ions can be effectively bound by using CaO to activate TETS with higher mechanical strength. When the CaO content is 10 wt%, the strength of the 28-day-cured body can reach more than 20 MPa, the chloride ion binding amount is 38.93 mg/g, and the chloride binding rate is as high as 68%. The new product phases of the solidified sample are mainly Friedel's salt (FS) and calcite, in which the amount of FS production and the degree of crystal development are affected by the CaO content and curing age. The chloride binding ions in the solidified sample are mainly the chemical binding by FS. The FS diffraction peak strength increases with the increase of CaO content and curing age, but the calcite diffraction peak strength is less affected by them. FS mainly accumulates and grows in the pores of the solidified sample. It can optimize the pore structure of the solidified sample and improve the strength of the solidified sample while binding chloride ions. The results can provide useful information for the resource utilization of chlorine-containing TETS, the improvement of durability of Marine concrete, and the application of sea sand in concrete.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Materials (Basel) Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Materials (Basel) Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza