偏高岭土
粉煤灰
钙矾石
胶凝的
硅酸钠
抗压强度
废物管理
焚化
材料科学
浸出(土壤学)
城市固体废物
水泥
冶金
化学工程
硅酸盐水泥
环境科学
复合材料
工程类
土壤科学
土壤水分
作者
Jun Liu,Lei Hu,Luping Tang,Jun Ren
标识
DOI:10.1016/j.jhazmat.2020.123451
摘要
The proper treatment on hazardous municipal solid waste incineration fly ash (MSWIFA) is important. The application of alkali-activation technology to prepare alkali-activated MSWIFA (AAFA) material provides a potential not only to immobilise the heavy metals, but also to trigger its pozzolanic property in manufacturing building material. In this study, in addition to investigate the feasibility of alkaline activation technology in preparing AAFA with sodium silicate activator, the effect of metakaolin in AAFA (AAFM) was also explored to enhance its performance. The results showed that, compared to the AAFA, blending 10 % metakaolin in AAFA significantly improved both 28-day and 90-days compressive strengths, which was almost 200 % higher than that of AAFA. The compressive strength was increased with increasing the dosage of sodium silicate. The C-S-H gel was observed as the main hydration product of AAFA and AAFM. Moreover, the ettringite was observed in AAFM due to the reaction between the CaSO4 in MSWIFA and aluminate phase from metakaolin. Finally, the 28 and 210-day leaching behaviours of AAFM on Zn, Cu, Pb, Cd, Cr and Ni were successfully suppressed to less than 1 % of that originally from MSWIFA, which can meet the requirement from Chinese standards.
科研通智能强力驱动
Strongly Powered by AbleSci AI