Controlled sintering for cadmium stabilization by beneficially using the dredged river sediment

作     者：Yunxue Xia Dong Qiu Zhong Lyv Jianshuai Zhang Narendra Singh Kaimin Shih Yuanyuan Tang Yunxue Xia;Dong Qiu;Zhong Lyv;Jianshuai Zhang;Narendra Singh;Kaimin Shih;Yuanyuan Tang

作者机构：State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution ControlSchool of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Department of Civil EngineeringFaculty of EngineeringThe University of Hong KongHong Kong 999077China Environmental Science CenterDecarbonisation and Resource ManagementalBritish Geological SurveyNottinghamshireKeyworth NG125GGUK 

出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)

年 卷 期：2023年第17卷第5期

页      面：105-115页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：financially supported by the National Key R&D Program of China(No.2018YFC1902904) the National Natural Science Foundation of China(Nos.21707063 and 41977329) the Research Grants Council of Hong Kong(China)(Project T21-771/16R) Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control(China)(No.2017B030301012) The authors are sincerely grateful for the assistance of SUSTech Core Research Facilities(China) 

主　　题：Dredged river sediments Cadmium Sintering Stabilization Leaching 

摘      要：Cd-bearing solid wastes are considered to be a serious threat to the environment,and effective strategies for their treatment are urgently *** sintering has been considered as a promising method for efficiently incorporating heavy metal-containing solid wastes into various ceramic ***-rich dredged river sediment,especially Al and Si-containing oxides,can be treated as alternative ceramic precursors rather than being disposed of as solid *** examine the feasibility of using waste sediment for Cd stabilization and the phase transition mechanisms,this study conducted a sintering scheme for the mixtures of CdO and dredged river sediment with different(Al+Si):Cd mole *** investigations have been performed on phases transformation,Cd incorporation mechanisms,elemental distribution,and leaching behaviors of the sintered *** showed that Cd incorporation and transformation in the sintered products were influenced by the mole ratio of(Al+Si):*** the high-Cd series((Al+Si):Cd=6:1),CdSiO_(3),Cd_(2)SiO_(4),CdAl_(2)(SiO_(4))_(2) and Cd_(2)Al_(2)Si_(2)O_(9) were predominant Cd-containing product phases,while Cd2Al2Si2O9 was replaced by CdAl_(4)O_(7) when the mole ratio of(Al+Si):Cd was 12:1(low-Cd series).Cd was efficiently stabilized in both reaction series after being sintered at≥900℃,with5%leached ratio even after a prolonged leaching time,indicating excellent long-term Cd *** study demonstrated that both Cd-containing phases and the amorphous Al-/Si-containing matrices all played critical roles in Cd stabilization.A promising strategy can be proposed to simultaneously reuse the solid waste as ceramic precursors and stabilize heavy metals in the ceramic products.