Micro-Raman Spectroscopy Investigation of Crystalline Phases in EAF Slag

Abstract

Electric arc furnace (EAF) slags were investigated by micro-Raman spectroscopy. A slag sample characterised by well-developed crystalline phases was obtained. The EDXS elemental composition made it possible to recognize the grains corresponding to the brownmillerite, larnite and magnesioferrite phases, as identified by XRD in the same powdered sample. The grains were collected and analysed by µ-Raman spectra, and the results showed good reproducibility in each grain and good agreement with spectra of the phases reported in the literature. A Raman database devoted to crystalline phases of EAF slag identification was created to be used by portable Raman instruments, allowing the phase characterisation of the slag directly during steel production.

A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites

“…Microstructural analysis of polished SFS sections can be effective to better assess the phase distribution, such as with scanning electron microscopy (SEM) with backscattered electron (BSE) imaging and mapping with energy dispersive X-ray (EDX) spectroscopy [10,24,66,251,264,281,[313][314][315]. This technique has also proven to be effective in evaluating that the surface of SFS particles may be different from the particle interior [10,251], as exampled in Figure 1, which could be a contributing factor in how concrete with SFS aggregates behaves, as discussed in Section 4.…”

Magnetically recoverable steel slag/TiO2 visible‐light‐driven photocatalyst for paraquat degradation

“…For SCS@Fe‐TiO 2 , the Raman band at 708 cm −1 may be attributed to iron oxide in steel slag. In addition, brownmillerite (Ca 2 (AlFe) 2 O 5 ), magnesioferrite (Mg(Fe 3+ ) 2 O 4 ), and magnetite (Fe 3 O 4 ) phases, observed in steel slag, have strong bands at about 700 cm −1 42 . The bands in the range between 850 and 1100 cm −1 are attributed to the SiO bond, 43 as the Raman band at ~1083 cm −1 is attributed to SiO* bond stretching vibration of Si 2 O 5 2− of the SiOSi bond in SiO 2 44 …”

Investigation of the Impact of Biochar Application on Foaming Slags with Varied Compositions in Electric Arc Furnace-Based Steel Production

“…Additionally, merwinite occurs in samples with the lowest basicity it aligns with [49] All slag foam samples underwent qualitative assessment via XRD analysis, revealing different phases in each sample. Mainly, it detected such phases as silicates, namely, larnite Ca2SiO4 (00-033-0302) or dicalcium silicate (00-002-0843), gehlenite Ca2(Al(AlSi)O7) (01-079-2421), merwinite Ca3MgSi2O8 (01-074-0382), and monticellite CaMgSiO4 (01-084-1320); ferrite, namely, brownmillerite Ca2(Al,Fe)2O5 (00-030-0226); metal oxide, namely, wuestite FeO (00-046-1312); spinels, namely, magnesium iron oxide Fe2MgO4 (01-077-2367) and magnesium aluminum oxide Mg0.4Al2.4O4 (01-084-0378); and some presence of metallic iron (00-003-1050), which are the common phases [46][47][48].…”