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| Co-hydrothermal processing for stabilize of different waste incinerator fly ash and its mechanism |
| RUAN Yu1, ZONG Da2, CHEN Zhi-liang1, ZHANG Han-wei2, HUANG Qun-xing1, LU Sheng-yong1, CHI Yong1, YAN Jian-hua1 |
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;
2. Everbright Green Environmental Protection Institute, Nanjing 211100, China |
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Abstract MSWI fly ash is rich in heavy metals which is easily leached to pollute the environment. By studying the physical and chemical characteristics of fly ash in fluidized bed and grate furnace, it was found that hibschite and tobermorite could be co-hydrothermally synthesized by the fluidized-bed fly ash and grate-furnace fly ash without any additives. The fluidized-bed fly ash is used as a source of silicon and aluminum while the grate-furnace fly ash is used as an alkali activator. Heavy metals were stabilized in the crystal. The mechanism of hydrothermal synthesis was analyzed based on the hydrothermal products and the surface morphology of fly ash. The mechanism of adsorption of heavy metals was explained by the crystal structure of tobermorite. There was almost no heavy metal in the liquid phase after the hydrothermal reaction. The leaching toxicity of heavy metals was quantitatively evaluated with heavy metal leaching rate. Heavy metal leaching rate of fly ash after hydrothermal reaction was significantly lower than that of fluidized bed fly ash. When the mass ratio of fluidized bed fly ash to grate furnace fly ash added by the hydrothermal reaction was 7:3, the leaching rates of Cd, Cr, Cu, Pb, and Zn after hydrothermal heating were the lowest. The leaching rates were 0.073%, 0.006%, 0.107%, 0.006%, 0.326%, respectively.
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Received: 29 December 2018
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