Study on vitrification of MSWI fly ash with industrial solid waste
ZHAO Ang-ran1,2, REN Qiang-qiang2, TONG Hui-ling1
1. Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China; 2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Abstract：Industrial solid waste with high Si and Al content (coal gangue and blast furnace slag) was used as additive for thermal treatment of municipal solid waste incineration (MSWI) fly ash, to improve its fusibility and properties of products. With the increase of additive, main mineral composition of products were changed from chlorellestadite and wadalite containing Cl to mayenite, larnite, melilite and anorthite. Quaternary basicity (R4) was used to evaluate fusible composition. Alkaline MSWI fly ash (R4 > 1) can be neutralized by acidic industrial solid waste (R4 < 1), to form neutral mixed ash (R4 ≈ 1) which containd 30% coal gangue or 40% blast furnace slag. The fusibility temperatures of neutral mixed ash were the lowest and FT representing complete fusion was 1260 and 1200℃. At 1300℃ glass-ceramics with crystal phase of melilite were formed by vitrification during cooling. Within vitrification, more than 99% of chlorine was separated from the solid phase. By volatilization separation, solidification and stabilization, the leaching capacity of heavy metals Cr, Ni, Zn, Cd and Pb was reduced by more than 95%, while that of Cu was reduced by more than 85%.
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