Efficient use of steel slag in alkali-activated fly ash-steel slag-ground granulated blast furnace slag ternary blends

Song, Wei; Zhu, Zhiduo; Pu, Shaoyun; Wan, Yu; Huo, Wangwen; Song, Shigong; Zhang, Jun; Yao, Kai; Hu, Lele

doi:10.1016/j.conbuildmat.2020.119814

Cited by 87 publications

(28 citation statements)

References 63 publications

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“…As shown in Figure 8 b, the XRD patterns of COSGB with curing age of 28 days are compared with those of OSR, SS and GGBS before mixed curing. From Figure 8 b, the crystalline peaks, including calcium sulfate (CaSO 4 ) and ferric oxide (Fe 3 O 4 ) that are originally present in OSR and the magnesium hydroxide (Mg(OH) 2 ) and calcium hydroxide (Ca(OH) 2 ) that are originally present in SS, disappeared [ 38 ]. This shows that these components dissolve due to the alkali activation reaction after mixing.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Cemented Oil Shale Residue–Steel Slag–Ground Granulated Blast Furnace Slag Backfill and Its Environmental Impact

Sun

et al. 2021

Materials

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A new environmentally friendly cemented oil shale residue–steel slag–ground granulated blast furnace slag backfill (COSGB) was prepared using oil shale residue (OSR), steel slag (SS) and ground granulated blast furnace slag (GGBS) as constituent materials. Based on univariate analysis and the Box–Behnken design (BBD) response surface method, the three responses of the 28 days unconfined compressive strength (UCS), slump and cost were used to optimize the mix ratio. Using a combination of scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP), the reaction products, microscopic morphology and pore structure of the specimens with the optimal mix ratio at different curing ages were analyzed. The influence of heavy metal ions from the raw materials and the COSGB mixtures on the groundwater environment was studied by leaching tests. The research demonstrates that the optimal mix ratio is GGBS mixing amount 4.85%, mass ratio of SS to OSR 0.82, and solid mass concentration 67.69%. At shorter curing age, the hydration products are mainly calcium alumino silicate hydrate (C-A-S-H) and calcium silicate hydrate (C-S-H) gels. With the increase of curing age, ettringite (AFt) and C-S-H gels become the main source of the UCS. Meanwhile, the porosity of the filler decreases continuously. The leaching concentration of heavy metal ions from the COSGB mixtures is all lower than the leaching concentration of raw materials and meet the requirements of the Chinese groundwater quality standard (GB/T 14848-2017). Therefore, this new COSGB cannot pollute the groundwater environment and meets backfill requirements. The proposed technology is a reliable and environmentally friendly alternative for recycling OSR and SS while simultaneously supporting cemented paste backfill (CPB).

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Section: Resultsmentioning

confidence: 99%

Preparation of Cemented Oil Shale Residue–Steel Slag–Ground Granulated Blast Furnace Slag Backfill and Its Environmental Impact

Sun

et al. 2021

Materials

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“…e optimum content of GBFS-steel slag was found to be 40% [61]. e setting time, initial flow, and early and later compressive strength of paste increased due to the presence of steel slag [61]. In addition, the brittleness decreased by adding steel slag [61].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 92%

“…e setting time, initial flow, and early and later compressive strength of paste increased due to the presence of steel slag [61]. In addition, the brittleness decreased by adding steel slag [61]. More gel products formed by hydration of GBFS-steel slag refined the pore structure, which was the main reason for the improvement of strength [61].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 96%

“…It is also expected to be an effective way to use steel slag. In alkali-activated fly ash-GBFS-steel slag ternary system by Song et al [61], water glass with a modulus of 1.6 was used as activator, and composite additive of GBFS-steel slag varied from 10% to 50%. e optimum content of GBFS-steel slag was found to be 40% [61].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 99%

“…In alkali-activated fly ash-GBFS-steel slag ternary system by Song et al [61], water glass with a modulus of 1.6 was used as activator, and composite additive of GBFS-steel slag varied from 10% to 50%. e optimum content of GBFS-steel slag was found to be 40% [61]. e setting time, initial flow, and early and later compressive strength of paste increased due to the presence of steel slag [61].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 99%

See 2 more Smart Citations

Advances in Understanding the Alkali‐Activated Metallurgical Slag

Liu

Zhang

Sun

2021

Advances in Civil Engineering

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This paper summarized and reviewed the mechanism and macro-performance of alkali-activated metallurgical slag, including steel slag, copper slag, ferronickel slag, and lead-zinc slag. Better activated method and alkali-activator are still needed to be developed to improve the performance of the metallurgical slag with low reactivity. Besides, the chemical components’ variation of these metallurgical slags from different regions will lead to unpredictable performance, which needs further study.

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Preparation and Application of Slag‐Based Catalyst for Steelmaking

Zhang,

Wang,

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et al. 2024

steel research int.

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This study focuses on utilizing ground granulated blast furnace slag (GGBS) from a steel plant as the main raw material, with water and calcium‐based montmorillonite as binders, with manganese and alkali metal nitrates (Na, K, Mg, Ca). A series of supported denitration catalysts are prepared using the equal volume impregnation method. These catalysts are then employed in the selective catalytic reduction process to investigate their impact on denitration effectiveness. Furthermore, the mechanism of low‐temperature denitration in selective catalytic reduction is analyzed by combining catalyst activity tests and characterization techniques. The activity of catalysts is assessed through Fourier transform infrared spectrometer (FT‐IR), X‐Ray diffraction (XRD), and search engine marketing (SEM) characterization tests, along with examining its denitration and sulfur resistance capabilities to determine the denitration mechanism. Experimental results indicate that Mn–Mg/GGBS exhibit the most efficient low‐temperature denitrification effect, and it demonstrates certain sulfur resistance with a 5% Mn loading and a 3% second active component. Introducing Ce as the third active component further enhances the sulfur resistance of Mn–Mg–Ce/GGBS when loaded at 1%.

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Efficient use of steel slag in alkali-activated fly ash-steel slag-ground granulated blast furnace slag ternary blends

Cited by 87 publications

References 63 publications

Preparation of Cemented Oil Shale Residue–Steel Slag–Ground Granulated Blast Furnace Slag Backfill and Its Environmental Impact

Preparation of Cemented Oil Shale Residue–Steel Slag–Ground Granulated Blast Furnace Slag Backfill and Its Environmental Impact

Advances in Understanding the Alkali‐Activated Metallurgical Slag

Preparation and Application of Slag‐Based Catalyst for Steelmaking

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