Utilizing blast furnace slags (BFS) to prepare high-temperature composite phase change materials (C-PCMs). (20th July 2018)

• Record Type: Journal Article
• Authors: Zhang, Yuanbo; Liu, Jicheng; Su, Zijian; Liu, Bingbing; Lu, Manman; Li, Guanghui; Anderson, Corby; Jiang, Tao
• Is Part Of: Construction & building materials. Volume 177(2018)
• Page Start: 184
• Page End: 191
• Publication Date: 2018-07-20
• Subjects: Blast furnace slag -- Composite phase change materials -- Thermal energy storage -- NaNO3; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.05.110
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: Utilization of BFS to prepare high-temperature C-PCMs was proposed. Porous structure and thermostability of BFS were characterized. Excellent chemical compatibility between NaNO3 and BFS was demonstrated. NaNO3 /BFS C-PCMs have good thermal stability. Abstract: Blast furnace slag (BFS) is a typical solid waste generated in the steel production. Most of previous investigations have reported that the BFS has been used as traditional construction materials (cement, roadbed filling, concrete). In this study, a novel use route for BFS was proposed to prepare high-temperature composite phase change materials (C-PCMs) for thermal energy storage. Three typical inorganic PCMs (NaNO3, Al and Na2 SO4 with different operating temperature) were blended with the pre-ground BFS to fabricate BFS-based C-PCMs by means of a mixing and sintering process. The results showed that NaNO3 had excellent chemical compatibility with BFS and the prepared C-PCMs had perfect phase change performance. The enthalpies of NaNO3 /BFS C-PCMs was 65.53 J/g with melting point 300.5 °C and the super-cooling was only 0.1 °C. Furthermore, the NaNO3 /BFS C-PCMs could retain good thermal reliability after 100 thermal cycles, which presented a potential application in the thermal energy storage system. In addition, the morphological structure, thermal reliability and heat transfer property of the NaNO3 /BFS C-PCMs were characterised by using SEM, TGA and TG-DSC.