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学者姓名：周永祥
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Abstract ：
Introduction: In order to promote the comprehensive utilization of iron and steel solid waste, steel slag (SS), granulated blast furnace slag (GBFS), and flue gas desulfurization gypsum (FGDG) were used as rawmaterials to replace cement to prepare the full solid waste premixed solidified agent (PSA). Then PSA, iron ore tailings (IOTs), and water were mixed to prepare building foundation pit backfilling materials (BFPBM). Methods: Various tests were conducted to investigate the effects of SS fineness, SS content and mixing ratio of PSA on the properties of PFPBM, including mechanical property test, X-ray diffraction (XRD), scanning electronic microscopy (SEM), energy dispersive spectrometry (EDS) and synthetic precipitation leaching procedure (SPLP). The stability of the BFPBMwas tested and the hydrationmechanism of the PSA was analyzed. Results: The results show that when the specific surface area (SSA) of SS is 457m(2).kg(-1), the paste mass concentration (PMC) is 79%, themixing ratio of PSA is 20%, and themix proportion of PSA is SS: FGDG: GBFS = 58:10:32. In this case, water-reducing agent (WRA) accounting for 0.18% of the total amount of PSA is added. The 28d compressive strength of BFPBM is greater than 0.40MPa with the maximumvalue of 6.22 MPa, and the mixture slump of BFPBM is greater than 215mm, which meets the index requirements of Chinese National Standard T/CECS 1037-2022 Technical Standard for Backfilling Project by Using Premixed Fluidized Solidified Soil. Discussion: According to the mechanismstudy, themineral phases of the PSA after hydration are: C2S, C3S, Ca (OH)2, ettringite (AFT), C-S-H gel, and RO phase. C2S, C3S, CaSO4 and other substances gradually disappeared with the hydration, while the content of AFt and C-S-H gel substances increased. BFPBM prepared from iron and steel waste has high strength and environmental friendliness, making it have good application prospects in foundation pit backfilling and mine filling.
Keyword ：
building foundation pit backfilling materials (BFPBM) building foundation pit backfilling materials (BFPBM) ettringite (AFt) ettringite (AFt) steel slag (SS) steel slag (SS) iron and steel solid waste iron and steel solid waste granulated blast furnace slag (GBFS) granulated blast furnace slag (GBFS) premixed solidified agent (PSA) premixed solidified agent (PSA) mixture slump mixture slump
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| GB/T 7714 | Zhang, Hongze , Qi, Yang , Jing, Jianlin et al. Properties and environmental impact of building foundation pit backfilling materials containing iron and steel solid waste [J]. | FRONTIERS IN EARTH SCIENCE , 2023 , 11 . |
| MLA | Zhang, Hongze et al. "Properties and environmental impact of building foundation pit backfilling materials containing iron and steel solid waste" . | FRONTIERS IN EARTH SCIENCE 11 (2023) . |
| APA | Zhang, Hongze , Qi, Yang , Jing, Jianlin , Wang, Changlong , Zhou, Yongxiang , Zhang, Kaifan et al. Properties and environmental impact of building foundation pit backfilling materials containing iron and steel solid waste . | FRONTIERS IN EARTH SCIENCE , 2023 , 11 . |
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Abstract ：
Introduction: In our study, various test methods were adopted to explore the mineralogical characteristics, grindability, particle morphology, particle size distribution, and environmental leaching toxicity of iron ore tailings (lOTs).Methods: The methods include petrographic analysis, X-ray diffraction (XRD), scanning electronic microscopy (SEM), synchronous thermal analyzer (DSC-TGA), electron probe X-ray microanalyser (EPMA), and synthetic precipitation leaching Procedure (SPLP).Results: The results show that the used IOTs contained 14.54% iron which was mainly stored in magnetite and pyrite. The content of iron silicate accounted for 11.82% of the total iron content. Most of it existed in silicate minerals, including grunerite and hornblende. A small amount of iron was contained in biotite, chlorite and augite. Besides, the grindability of lOTs was much better than that of granulated blast furnace slag (GBFS). After grinding for 140 min, the mass fraction of lOTs particles with the particle size less than 5 um was 44.19%. These particles could be used to fill in the voids in the cement-powder-packed structure. lOTs also contained a large number of submicron and nanoscale particles.Discussion: With great strength and environmental friendliness, the composite cementitious material (CCM) prepared from lOTs can be well applied to the building material field and environmental remediation.
Keyword ：
iron ore tailings (IOTs) iron ore tailings (IOTs) grindability grindability particle morphology particle morphology Particle size distribution Particle size distribution mineralogical characteristics mineralogical characteristics composite cementitious material (CCM) composite cementitious material (CCM)
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| GB/T 7714 | Wang, Changlong , Jing, Jianlin , Qi, Yang et al. Basic characteristics and environmental impact of iron ore tailings [J]. | FRONTIERS IN EARTH SCIENCE , 2023 , 11 . |
| MLA | Wang, Changlong et al. "Basic characteristics and environmental impact of iron ore tailings" . | FRONTIERS IN EARTH SCIENCE 11 (2023) . |
| APA | Wang, Changlong , Jing, Jianlin , Qi, Yang , Zhou, Yongxiang , Zhang, Kaifan , Zheng, Yongchao et al. Basic characteristics and environmental impact of iron ore tailings . | FRONTIERS IN EARTH SCIENCE , 2023 , 11 . |
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Abstract ：
Introduction: In order to improve the utilization efficiency of industrial waste discharged in the process of iron and steel metallurgy, a kind of material that can replace cement for mine filling is sought. In the test, steel slag (SS) and vanadium-titanium slag (VTS) were used as the primary raw materials to prepare cementing agents (CA). Then, combine it with vanadium-titanium iron ore tailings (VTIOTs) to make mine cemented paste backfill material (CPBM).Methods: The composition, properties and hydration mechanism of CPBM are studied through various tests, in-cluding mechanical property test, hydration heat test, X-ray diffraction (XRD), scanning electronic mi-croscopy (SEM), and fourier transform-infrared spectroscopy (FT-IR).Results: The results show that when the following conditions are met, the slump is 216 mm, and the 28-day flexural strength and compressive strength of CPBM reach 4.25 and 9.41 MPa, respectively, which meets the requirements of Chinese National Standard GB/T 39489-2020 Technical specification for the total tailings paste backfill: the mass percentage SS: VTS: phosphogypsum (PG): dicyandiamide waste slag (DWS) = 31:59:6:4; the content of compound phosphoric acid (CPA) accounts for 4% of the dry material; the cement sand ratio of CPBM is 1:4; the paste mass concentration (PMC) is 80%; and the content of water reducing agent (WRA) is 0.18%.Discussion: Mechanism studies show that the hydration product of the CA is mainly ettringite (AFt) and C-S-H gel. The addition of CPA promotes the hydration of active minerals in SS and VTS. The existence of PG pro-motes the formation of AFt, and the formation of AFt further promotes the fracture of [AlO4](5-) and [SiO4](4-) along the bridge oxygen in VTS and SS.
Keyword ：
cemented paste backfill material (CPBM) cemented paste backfill material (CPBM) vanadium-titanium slag (VTS) vanadium-titanium slag (VTS) steel slag (SS) steel slag (SS) cementing agent (CA) cementing agent (CA) ettringite ettringite
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| GB/T 7714 | Wang, Changlong , Qi, Yang , Jing, Jianlin et al. Properties and microstructure of total tailings cemented paste backfill material containing mining and metallurgical solid waste [J]. | FRONTIERS IN EARTH SCIENCE , 2023 , 11 . |
| MLA | Wang, Changlong et al. "Properties and microstructure of total tailings cemented paste backfill material containing mining and metallurgical solid waste" . | FRONTIERS IN EARTH SCIENCE 11 (2023) . |
| APA | Wang, Changlong , Qi, Yang , Jing, Jianlin , Ma, Jintao , Zhou, Yongxiang , Ping, Haoyan et al. Properties and microstructure of total tailings cemented paste backfill material containing mining and metallurgical solid waste . | FRONTIERS IN EARTH SCIENCE , 2023 , 11 . |
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