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Wu D, Jing L, Li Y, Ran T, Peng S, Jing W. Enhancing Fatigue Performance of Coal Gangue Concrete (CGC) through Polypropylene Fiber Modification: Experimental Evaluation. Polymers (Basel) 2024; 16:1096. [PMID: 38675015 PMCID: PMC11054171 DOI: 10.3390/polym16081096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/09/2024] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
Coal gangue is a byproduct of coal mining and processing, and according to incomplete statistics, China has amassed a substantial coal gangue stockpile exceeding 2600 large mountains, which poses a serious threat to the ecological environment. Utilizing gangue as a coarse aggregate to produce gangue concrete (GC) presents a promising avenue for addressing the disposal of coal gangue; however, gangue concrete presents several challenges that need to be tackled, such as low strength and poor resistance to repeated loads. In this study, polypropylene fibers (PPFs) were incorporated into gangue concrete to enhance its utilization rate. Uniaxial compressive and repeated loading experiments were then conducted to investigate the uniaxial strength and fatigue properties of polypropylene fiber-reinforced gangue concrete (PGC) with varying gangue substitution rates (20%, 40%, and 60%) and different polypropylene fiber admixtures (0, 0.1%, 0.2%, and 0.3%). The findings indicate that incorporating gangue at a substitution rate of 40% could notably enhance the uniaxial compressive strength of PGC, resulting in a maximum increase of 19.4%. In the repeated loading experiments, the ductility of PGC was enhanced with the incorporation of PPFs, resulting in a reduction of 33.76% in the damage factor and 19.42% in residual strain for PGC-40-0.2 compared to PGC-40-0. A PPF content of 0.2% was found to be optimal for enhancing the fatigue performance of PGC. Scanning electron microscope (SEM) testing proved the improvement effect of polypropylene fiber on gangue concrete from a microscopic perspective. This study provides crucial experimental data and a theoretical foundation for the utilization of gangue concrete in complex stress environments.
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Affiliation(s)
- Di Wu
- School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232000, China
- School of Computing, Macquarie University, Sydney 2109, Australia
| | - Laiwang Jing
- School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232000, China
| | - Yan Li
- School of Computing, Macquarie University, Sydney 2109, Australia
| | - Tao Ran
- School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232000, China
- School of Computing, Macquarie University, Sydney 2109, Australia
| | - Shaochi Peng
- School of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610000, China
| | - Wei Jing
- School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232000, China
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Lv X, Yang S, Deng J, Lei J, Shu Z. Formulation of ferric/phosphorus composite coating on coal gangue as a novel fertilizer for enhancing slow-release of silicon and implication of As, Cr and Pb. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 354:120347. [PMID: 38359628 DOI: 10.1016/j.jenvman.2024.120347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 01/23/2024] [Accepted: 02/08/2024] [Indexed: 02/17/2024]
Abstract
Owing to the abundant silicon content in coal gangue, its conversion into fertilizer can help address large-scale storage. Nonetheless, the rapid release of silicon in coal gangue poses challenges for plants to fully utilize it. A slow-release fertilizer prepared by ferric/phosphorus composite coating on coal gangue (C@SP) was developed in the study. The findings revealed that the C@SP can facilitate slow release of Si and enhance the stabilization of As, Pb, and Cr in soil. C@SP can react with As and Cr to form stable Fe-As-PO4 and Fe-Cr-PO4 compounds. The -OH in C@SP can combine with Pb, transforming it into insoluble Pb, which was then integrated into the crystal structure with ferric/phosphorus composite or Fe(III)-oxyhydroxysulfate to create a more stable form. The silicon release was promoted by the conversion of the passivation film to iron oxides. Thus, the fertilizer holds promise for application in environmental activities.
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Affiliation(s)
- Xin Lv
- Inner Mongolia Research Institute, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China
| | - Sen Yang
- Inner Mongolia Research Institute, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China
| | - Jiushuai Deng
- Inner Mongolia Research Institute, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China; Engineering Technology Research Center for Comprehensive Utilization of Rare Earth, Rare Metal and Rare-Scattered in Non-ferrous Metal Industry, CUMTB, Beijing, 100083, China; Key Laboratory of Separation and Processing of Symbiotic-Associated Mineral Resources in Non-ferrous Metal Industry, CUMTB, Beijing, 100083, China.
| | - Jianlan Lei
- Jiangxi Gaiya Environ Sci & Technol Co. Ltd, Shangrao, Jiangxi, 334000, China
| | - Zigang Shu
- Jiangxi Gaiya Environ Sci & Technol Co. Ltd, Shangrao, Jiangxi, 334000, China
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Wang Q, Peng Y, Chen M, Xu M, Ding J, Yao Q, Lu S. Synthesis of layered double hydroxides from municipal solid waste incineration fly ash for heavy metal adsorption. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169482. [PMID: 38135065 DOI: 10.1016/j.scitotenv.2023.169482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/09/2023] [Accepted: 12/16/2023] [Indexed: 12/24/2023]
Abstract
The process of urbanization has resulted in a continuous growth of the production of municipal solid waste, consequently leading to the increase of municipal solid waste incineration fly ash (MSWI FA) over time. This has prompted the need for effective disposal and value-added utilization strategies for MSWI FA. In this study, a hydrothermal method was employed to synthesize CaAl layered double hydroxides (LDHs) using MSWI FA as the raw material. The main objective was to investigate how different synthesis parameters affect the crystallinity of the layered bimetallic hydroxides. Subsequently, the synthesized LDHs were characterized using various techniques such as BET, SEM, XRD, FT-IR, and XPS. The results revealed the presence of calcium and aluminum cations in the interlayer region of the synthesized material, with chloride ions, sulfate ions, and acetate ions being the predominant anions. Moreover, the formation of LDHs presents an effective approach for the self-purification of leachates derived from MSWI FA. The LDHs exhibited excellent adsorption capacity for Cd2+ and Cu2+ in wastewater, with maximum values of 730 mg·g-1 and 446 mg·g-1, respectively. The adsorption mechanisms involved isomorphous substitution, complexation, as well as the precipitation of hydroxides or interlayer anions. This method presents a novel approach for effectively utilizing MSWI FA to produce environmentally friendly value-added adsorbents.
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Affiliation(s)
- Qionghao Wang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yaqi Peng
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Min Chen
- Taizhou Institute of Zhejiang University, Zhejiang University, Taizhou 318000, China
| | - Mengxia Xu
- Department of Chemical and Environmental Engineering, and New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China; Key Laboratory of Carbonaceous Waste Processing and Process Intensification of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China
| | - Jiamin Ding
- Taizhou Institute of Zhejiang University, Zhejiang University, Taizhou 318000, China
| | - Qi Yao
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
| | - Shengyong Lu
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China; Taizhou Institute of Zhejiang University, Zhejiang University, Taizhou 318000, China
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