Experimental study on alinite ecocement clinker preparation from municipal solid waste incineration fly ash

This paper presents the laboratory scale study on the preparation of ecocement clinkers, whose main mineral is alinite, from municipal solid waste incineration fly ash. X-ray diffraction technique was used to monitor the phase formation during the burning of raw mixes. Effects of compositions, firing time and firing temperature on the properties of clinkers have been investigated. The hydration behaviour of the ecocement obtained from the optimized clinkers was also studied. From the results it is observed that the characteristics of the clinkers are strongly dependent on the raw mix compositions and firing temperature but not so much on firing time. The desirable clinkers can be obtained by firing the raw mix at 1,200°C for 1 h and controlling the compositional parameters KH (lime saturation moduli) around 1.02, a (silica-alumina ratio) around 4.50, Cl (Chlorides content) around 7.6% and m (MgO content) around 1.40%. Results also show that the ecocement exhibit a faster hydration kinetics than Ordinary Portland Cement.