Preparation of Belite Sulfoaluminate Cement Using Phosphogypsum Reduced by Gaseous Sulphur as Sole Calcium Oxide Source
CHEN Yanxin
SU Jiahao
ZHAO Bo
SONG Qiang
NIE Jiao
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(C4A3(S)),Ca2SiO4(β-C2S)and Ca8Fe4Al4O20(C4AF),with small amounts of gehlenite(C2AS)and alpha'-Ca2SiO4·0.05Ca3(PO4)2(α'-C2S).When the calcination temperature and calcination time are increased,the content of C4A3(S) increases.However,above 1 300℃ and 90 min,the formation of C4A3(S) 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.
Keywords：phosphogypsumclinker firingmineral compositionbelite sulfoaluminate cement
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 1292-1302 )