Desulphurization mechanism and engineering practice of carbide slag

Qi, Jiamin; Zhou, Pan; Yang, Dengfeng; Wang, Zixuan; Li, Bin

doi:10.1007/s11356-022-21894-4

Cited by 7 publications

(7 citation statements)

References 36 publications

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“…Shang et al [28] reported that the addition of 20.0% GBFS increased the drying shrinkage of FA-based geopolymer material due to its rapid hydration nature and large water absorption. Furthermore, the addition of 20.0% CSG led to a decreasing trend in the drying shrinkage of FA-based geopolymer material due to the main composition of Ca(OH) 2 and CaO [7]. In addition, the 20.0% SR reduced the shrinkage of FA-based geopolymer material owing to the chemical compositions of insoluble CaCO 3 , CaSO 4 , and Ca(OH) 2 in SR [13].…”

Section: Drying Shrinkage Analysismentioning

confidence: 93%

“…(2) High-calcium-based slags The production of the backfill paste requires the use of four distinct types of highcalcium-based slags, namely CSG, SR, GBFS, and BRS. The chosen CSG was obtained using a production process that is concentrated in the PVC manufacturing sector [7], and it was supplied by a chemical industrial plant located in Qinghai, China, that manufactures C 2 H 2 . The CaO content, 62.6%, of the CSG results in its classification as a category II industrial solid waste.…”

Section: Raw Materialsmentioning

confidence: 99%

“…In terms of CSG, increasing the CSG/GBFS ratio produces more crystal calcium hydroxide, which is detrimental to strength development, while adding LP offers more Ca(OH) 2 than CSG to accelerate GBFS hydration [2]. Previous research found that the addition of 20.0% CSG to FA-based geopolymer composites decreased fluidity and improved long-term strength [7]. Owing to their identical chemical components after the burning process, BRS should possess similar effects on the characteristics of pastes as CSG.…”

Section: Effects Of Raw Materials On Fresh and Hardened Propertiesmentioning

confidence: 99%

“…In addition, the treatment of solid wastes, such as fly ash (FA) in power plants and other slags in manufacturing-businesses, constitutes a significant environmental and social problem. The bulk of industrial solid wastes is still left in the open, endangering the local air, water, and land ecosystems, even though a lot of FA and slag have been recycled into cement, concrete, and geotechnical materials [6][7][8][9]. For industrial wastes such as FA and slag, amongst others, to be utilized as a replacement for Portland cement to the greatest extent feasible, research and development of novel cementitious materials are required to find solutions to the challenges described above.…”

Section: Introductionmentioning

confidence: 99%

“…Grouting backfill paste was created by combining SR and FA in experimental programs; the optimal paste, designated SFN6, had desirable properties such as a high stone ratio (98.6%), high fluidity (260 mm), and high compressive strength (3.70 MPa) [9]. Moreover, CSG was used to enhance the physical, mechanical, and microstructural characteristics of FA-based geopolymers [7] by long-term curing. Due to their comparable chemical components, the reuse of CSG as an alternative to hydrated lime was investigated for the activation of GBFS [2].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Stability and Microstructure of a One-Step Mixed Geopolymer Backfill Paste Derived from Diverse Waste Slags

Zhao

Wang²,

Han³

et al. 2023

Sustainability

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The advent of industrialization has produced an enormous amount of industrial waste slag, which drastically pollutes environmental resources. This study examines the production, stability, and microstructure of a novel backfill geopolymer paste derived from multiple industrial waste slags, including silica-alumina precursors (low-calcium composition) and waste slags (high-calcium composition), as well as two additives. The characteristics of self-hardening were discovered. The effects of low-calcium fly ash, granulated blast furnace slag, red mud, and lime powder on fluidity and compressive strength were then evaluated. To assess the stability, the resistances to drying shrinkage, permeability, and chemical attack by an optimized geopolymer backfill paste were investigated. Furthermore, SEM-EDS, XRD, FTIR, and TG-DSC tests were employed to reveal the microstructures, products, and thermal stability. The results show that the backfill paste hardens well and has no impact on alkalinity dissolution for adjacent soils and water. The optimum sample, P1, had a water-binder ratio of 0.70, resulting in 201 mm fluidity and 2.1 MPa 28-d compressive strength. In terms of drying shrinkage, permeability, and Na2SO4 and NaCl solution attack, sample P1 outperformed the conventional Ordinary Portland cement paste (OPC) for 90 days. The paste P1 containing about 46.0 wt% waste slags meets the fresh and hardened property requirements for goaf backfill, and the chemical binding of P1 is acquired from the mixture of (N,C)-A-S-H, C-S-H, and C-A-S-H gel products. These findings lay the groundwork for the scientific application of a wide range of waste slags in backfill engineering.

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Section: Drying Shrinkage Analysismentioning

confidence: 93%

Section: Raw Materialsmentioning

confidence: 99%