Experimental study on preparation of lightweight low-silicon-aluminum ceramsite from municipal solid waste incineration fly ash in conjunction with bottom ash
Municipal solid waste incineration fly ash and municipal solid waste incineration bottom ash were co-disoposed for preparing lightweight low-silicon-aluminum ceramsite,effects of fly ash/bottom ash dosage and roasting conditions on the properties of ceramsite were studied,the phase transformation of minerals and the micro-morphology after thermal treatment were analyzed and the quality of the resulting product in terms of the leaching of heavy metals was assessed.The results showed that:(l)the optimal synthetic condition of lightweight ceramsite was a raw material ratio of 20.0％fly ash,40.0％bottom ash,40.0％tuff,preheating temperature of 500℃,roasting temperature of 1100℃ and roasting time of 10 min,and the resulting product exhibited a particle strength of 2 014 N,bulk density of 890 kg/m3 and 1 h water absorption rate of 8.60％.(2)New phases,such as diopside,hedenbergite and wollastonite were formed during the roasting process,and that a rich porous structure was formed inside ceramsite.(3)The leaching concentrations of heavy metals(Cr,Ni,Zn,As,Cd,Pb)in ceramsite were much lower than"Integrated wastewater discharge standard"(GB 8978-1996).
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