垃圾焚烧飞灰研制硫铝酸盐水泥及其水化特性

以城市垃圾焚烧飞灰(以下简称焚烧飞灰)为主要原料,在实验室电炉里成功烧成了硫铝酸盐水泥熟料.研究了硫铝酸盐水泥熟料的烧成过程、组成及其形貌特征,并分析掺加适量石膏的硫铝酸盐水泥水化及重金属浸出特性.结果表明:将焚烧飞灰作为主要原料可以煅烧出以C4A3(-S)和C2S为主要矿物的硫铝酸盐水泥熟料,焚烧飞灰在生料中的掺量不...

Preparation of Sulphoaluminate Cement from Municipal Solid Waste Incineration Fly Ash and Its Hydration Properties

Municipal solid waste incinerator(MSWI) fly ash was successfully used as a raw material in sintering sulphoaluminate cement clinker in the laboratory. The clinkerization process, morphology and compositions of the clinker were investigated. The hydration properties of sulphoaluminate cement and the toxicity leaching characteristics of heavy metals were also studied. The results show that the good quality clinkers in which C4A3S and C2S are presented as major phases can be sintered by using the MSWI fly ash as raw material, and the optimal amount of MSWI fly ash in the raw mix is about 30%. Microstructure of produced clinker was loose and lacunary and it appeared to be irregular tiny crystal. The sulphoaluminate cement with reasonable strength can be prepared by grinding the clinker with appropriate amount of gypsum. Porosity and mean pore diameter of harden cement paste decrease with the curing age. The results also indicate that the concentrations of all the investigated elements in the leachates are far below the regulatory limit up to 28 d, and the produced cements would not present a leaching hazard to environment.