Research on the preparation of high belite sulfoaluminate cement clinker from MSWI fly ash and heavy metal solidification
HAI Hong
LI Xiaohui
ZHU Zheng
HAN Dong
Abstract：This study developed a high-belite sulphoaluminate cement clinker using MSWI fly ash,carbide slag,and high-alumina coal gangue as primary raw materials in a mass ratio of 41∶41∶51.The raw mixture was calcined at 1300 ℃ for 45 min to produce clinker with dicalcium silicate(C2S)as the dominant phase.X-ray diffraction(XRD)and thermogravimetric(TG)analysis were employed to characterize the mineralogical composition and hydration behavior of the clinker.The results revealed that the main mineral phases in the clinker were C2S,C4A3(S),and a small amount of C4AF.The hydration products included C-(A)-S-H gel,AFm solid solution,and strätlingite.The 28-day compressive strength reached 50 MPa,meeting the mechanical performance requirements for 42.5-grade cement.Toxicity Characteristic Leaching Procedure(TCLP)tests showed that Cd,Zn,and Ni were below detection limits,while the highest leaching concentration of Cr was 0.068 mg/L,satisfying the regulatory limits.
Keywords：municipal solid waste incineration(MSWI)fly ashhigh-belite sulphoaluminate cementsolid wastemineral com-positionhydration performanceheavy metal solidificationenvironmental safetyresource utilization
Publication Date：2025-10-25
Online Publishing Date：2025-11-28(First online date of this platform, not the publication date of the document)
Pages：5( 10-14 )