Core-shell structured CaO aggregate prepared by granulating with Al chelating compound and its hydration resistance. Issue 8 (1st June 2020)

• Record Type: Journal Article
• Authors: Wang, Jinhu; Wei, Yaowu; Li, Bingrong; Li, Mengrui; Li, Nan
• Is Part Of: Ceramics international. Volume 46:Issue 8(2020)Part A
• Page Start: 10788
• Page End: 10796
• Publication Date: 2020-06-01
• Subjects: Core-shell structured CaO aggregate -- Hydration resistance -- Al chelating compound -- Granulation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.01.089
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A preparation method of core-shell structured CaO aggregates and its hydration resistance were investigated in this paper. Ca(OH)2 granules were obtained by granulation method and then soaked in Al chelating compound (hereinafter called ACC) ethanol solution, after that Ca(OH)2 granules were fired at different temperatures. The obtained CaO granules were characterized by measurements of crystalline phase formation, bulk density, apparent porosity, hydration resistance, pore size distribution, cylindrical crushing strength and microstructural analysis. It can be seen from the results that core-shell structured CaO granules with excellent hydration resistance can be prepared after treated with ACC and a protective shell layer was found on the surface of the granules. The ACC promoted the liquid phase sintering of CaO granules, which led to the grain growth and increased the density of granules. CaO grains were bonded by the tricalcium aluminate (C3 A) and the apparent porosity of the aggregate was reduced after heating, that decreased the contact area of CaO with water vapor.