Abstract
In this study, the underlying mechanism of zinc (Zn) stabilization during the co-gasification of sewage sludge (SS) with Shenmu coal (SM) was investigated using an in-situ visual furnace to analyze the distribution of Zn species. The findings classified two distinct stages within the co-gasification process: the organic matter gasification stage, occurring below 1000 °C, and the inorganic mineral melting stage, occurring above 1000 °C. The addition of SM can extend the organic matter gasification phase, in which the porous carbon structure of the SM char aids in the capture of Zn released during the devolatilization of SS. However, a sustained reducing atmosphere promoted the formation of Fe3O4, causing Zn destabilization. Subsequently, during the inorganic mineral melting stage, the complete reaction of carbon released Zn, which was adsorbed onto the carbon surface. Furthermore, the ash from SM contributes to the melting of the co-gasification residues, enhancing Zn stabilization through encapsulation by the molten phase and stabilization within the spinel lattice. This study highlights the critical role of liquid encapsulation in Zn stabilization during co-gasification.
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