Alkaline leaching mechanism of MSWI bottom ash:the pivotal role of Si(Al)chemical bonding environments  

作　　者：Ningning SHAO Zekun JIAO Weipeng FENG Yu JIN Fanlong KONG Zhijun DONG Zuotai ZHANG 

机构地区：[1]Institute of Technology for Marine Civil Engineering,Shenzhen Institute of Information Technology(SZIIT),Shenzhen 518172,China [2]School of Environmental Science and Engineering,Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Southern University of Science and Technology(SUSTech),Shenzhen 518055,China [3]Guizhou NASH Ecological Technology Co.,LTD,Guiyang 550016,China

出　　处：《Science China(Technological Sciences)》2025年第2期73-85,共13页中国科学(技术科学英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.52008265);the National Science Fund for Distinguished Young Scholars(Grant No.52225407);the Shenzhen Science and Technology Innovation Committee(Grant No.KCXFZ20211020174805008);supported by the Special Team Program for the research of new-generation alkali-activated low-carbon cement from SZIIT.

摘　　要：Municipal solid waste incineration bottom ash(MSWIBA)is a complex assemblage of aluminosilicate materials encompassing diverse solid wastes.Thus,its complexity poses great challenges to their resource utilization.For the sake of the alkali activation use of MSWIBA,this work focused on the characterizations and alkaline leaching experiments of various classified MSWIBA after sorting.Among the different categories of MSWIBA,waste glass(BA-G)and other unidentified slags(BA-O)were identified as potential precursors for alkali activation use.The alkaline leaching experiments proved that alkaline concentration,reaction temperature,reaction time,and raw material classification influenced the leaching process and results.Among these,the Si/Al chemical bonding environments from the material type played a pivotal role.When the materials had Q_(n)(n>2)as the primary bonding structure,steric hindrance by the chain frameworks affected the alkali dissolution process,resulting in gradual disintegration from the outer layers inward.For the materials dominated by Q1 frameworks,OH-could penetrate the frameworks,leading to their rapid depolymerization and outward dissolution.Overall,the Si/Al bonding environment played a crucial role in alkaline dissolution,providing theoretical guidance for classifying the alkali-activation utilization of MSWIBA and other aluminosilicate solid wastes.

关 键 词：municipal solid waste incineration bottom ash CLASSIFICATION alkaline leaching chemical bonding environments MECHANISM 

分 类 号：X705[环境科学与工程—环境工程]