Encapsulation of red mud with ultra-high performance concrete (UHPC) for immobilization of alkaline and heavy metals: Experiments and simulations

Wu, Di1; Xu, Qingqing2; Hou, Dongshuai1,3; Yu, Rui4,5; Wang, Muhan1; Zhu, Yaguang1; Zhang, Yue1; Sui, Shiyu1; Zhang, Minghui1; Song, Qiulei6,7; Wang, Xinpeng1

2023-09-01

10.1016/j.cemconcomp.2023.105152

CEMENT & CONCRETE COMPOSITES   影响因子和分区

0958-9465

1873-393X

To alleviate the storage of red mud (RM) and the resulting pollution, this study presented an encapsulation-based strategy for the safe management of RM, and adopted ultra-high performance concrete (UHPC) as an encapsu-lating material due to its superior impermeability and chemisorption properties. It is noteworthy to find that encapsulated material suffered from a selective chemisorption and density functional theory (DFT) calculations were innovatively employed to investigate the selective chemisorption mechanism. The simulation results sug-gested that distinct bonding forms lead to the selective chemisorption of heavy metals, with Pb being adsorbed by Si-O-Pb chemical bonds and a strong Si-O-Pb-O-Si long chain, while As and Cr only form relatively weak As-O and Cr-O bonds through their attraction to O atoms. With the thickness of the encapsulating material increases, the synergistic effect of chemical solidification and physical package is provided to achieve a stronger stabili-zation effect. The leaching results indicated that the encapsulated RM exhibited exceptionally low concentrations of hazardous components (i.e., Na at 1.580 mg/L, As at 0.003 mg/L, Cr at 0.027 mg/L, and undetected levels of Pb in encapsulated RM with a thickness of 1.5 mm), far below the limits set by the United States Environmental Protection Agency (EPA). This study opening a new window for the sustainable and efficient management of hazardous solid waste.

Red mud Immobilization Encapsulation UHPC Selective chemisorption Density functional theory (DFT) calculation

SCI ; EI

英语

其他

National Natural science foundation of China["U2006224","U21A20149","51978352","52008220"] ; National key research and development project[2022YFE0133800] ; Natural science foundation of Shandong Province["ZR2020JQ25","ZR2020QE045"] ; Natural science foundation of Jiangsu Province[BK20220254] ; Shandong Provincial Education Depart- ment, Taishan Scholars[tsqn.201812090] ; null[19-3-2-13-zhc]

Construction & Building Technology ; Materials Science

Construction & Building Technology ; Materials Science, Composites

WOS:001023656800001

ELSEVIER SCI LTD

20232714352702

Alkalinity ; Bond strength (chemical) ; Chromium ; Environmental Protection Agency ; Hazards ; Heavy metals

Environmental Impact and Protection:454.2 ; Metallurgy and Metallography:531 ; Chromium and Alloys:543.1 ; Chemistry, General:801.1 ; Physical Chemistry:801.4 ; Accidents and Accident Prevention:914.1 ; Probability Theory:922.1 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

MATERIALS SCIENCE

Web of Science

1.Qingdao Univ Technol, Dept Civil Engn, Qingdao 266033, Peoples R China
2.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
3.Collaborat Innovat Ctr Engn Construct & Safety Sha, Qingdao 266033, Peoples R China
4.Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
5.Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
6.Suzhou Concrete & Cement Prod Res Inst Co Ltd, Suzhou 215026, Peoples R China
7.Jiangsu High Durabil Concrete Engn Res Ctr, Suzhou 215026, Peoples R China

Wu, Di,Xu, Qingqing,Hou, Dongshuai,et al. Encapsulation of red mud with ultra-high performance concrete (UHPC) for immobilization of alkaline and heavy metals: Experiments and simulations[J]. CEMENT & CONCRETE COMPOSITES,2023,142.

Wu, Di.,Xu, Qingqing.,Hou, Dongshuai.,Yu, Rui.,Wang, Muhan.,...&Wang, Xinpeng.(2023).Encapsulation of red mud with ultra-high performance concrete (UHPC) for immobilization of alkaline and heavy metals: Experiments and simulations.CEMENT & CONCRETE COMPOSITES,142.

Wu, Di,et al."Encapsulation of red mud with ultra-high performance concrete (UHPC) for immobilization of alkaline and heavy metals: Experiments and simulations".CEMENT & CONCRETE COMPOSITES 142(2023).