Utilization of municipal solid waste incineration fly ash in lightweight aggregates

Washing pre-treatment of municipal solid waste incineration(MSWI) fly ash blended with shale and sludge was utilized in the manufacture of light-weight aggregates and processed to form ceramic pellets.A formula uniform design was performed to arrange the mixture ratio of the materials.The optimal mixture ratio of the materials was determined by measuring the bulk density,granule strength,and 1 h water absorption of the pellets.It is shown that the optimal mixture ratios of materials,MSWI fly ash,shale,and sludge,are 23.16%,62.58%,and 14.25%(mass fraction),respectively.The performance testing indicators of light-weight aggregates are obtained under the optimum mixture ratio:bulk density of 613 kg/m3,granule strength of 821N,and 1 h water absorption of 11.6%,meeting 700 grade light-aggregate of GB/T 17431.2-1998 standard.The results suggest that utilization of MSWI fly ash in light-weight aggregates is an effective method and a potential means to create much more values.