Immobilization of MSWI Fly Ash by High Temperature Self-propagating Method
Abstract：High temperature self-propagating method was used for the disposal of MSWI fly ash (FA).The maximum content of FA in the Mg-Fe2O3-FA system was investigated.Moreover,the effectiveness of non-hazardous process was evaluated and the transfer behavior of heavy metals in FA during the process was studied.The immobilization mechanisms of heavy metal elements were also explored based on XRD and SEM analysis.The results showed that the maximum content of FA is up to 65％,and the leaching concentrations of Pb,Cd,Cu and Cr drop from 21.51,0.19,0.18 and 0.58 mg/L to less than 0.53,0.12,0.06 and 0.07 mg/L respectively.Heavy metals such as Pb,Cd,and Zn volatilize heavily in the process of self-propagating reaction,and the amounts of evaporation is 92.24％,88.66％ and 40％ respectively while the FA content is 40％,while Cr in the form of cuprous oxide and Cu in the form of chromium minerals are immobilized in the products.XRD/SEM analyses showed that products exist as glass phase for the main body.Residual heavy metals in the system with low melting point materials form solid-liquid phase and cool rapidly to form close-grained solidified body subsequently.Heavy metals are immobilized by chemical bonding and physical encapsulation.
Keywords：MSWI fly ashhigh-temperature self-propagating methodheavy metalsimmobilization
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 56-59,128 )