The cationic effect of ferrous ions on the sulfide capacity of CaO-FetO-Al2O3-SiO2 slags was studied from the viewpoint of the ionic structure in the slag using micro-Raman spectroscopy. In the cation-excess region (M2+/2(Fe3+ + Al3+) > 1.0), the sulfide capacity was directly proportional to the basicity of the slags, owing to the S2− stabilizing effect of excess cations. However, in the cation-deficient region (M2+/2(Fe3+ + Al3+) < 1.0), the sulfide capacity was independent of the basicity of the slags owing to the deficiency of cations required for charge compensation with Al3+ and Fe3+. The cation-substitution effect on the sulfide capacity of the CaO-rich slags (FetO/(FetO + CaO < 0.5) exhibited a linear relationship with the Fe2+ content because Fe2+ had a stronger affinity with S2− compared to that with Ca2+. However, in the FetO-rich slags (FetO/(FetO + CaO > 0.5), the sulfide capacity decreased with the increase of the Fe2+ content owing to the Qn unit affinity of the Fe2+ ion. The sulfide capacity was determined by the competition between the Qn unit affinity and stability of the S2− ion, depending on the type of cation. Therefore, the partial covalent bonding between the M2+ cations (M: Ca, Fe) and aluminosilicate affected the ionic interactions with the S2− ions.
|Number of pages||11|
|Journal||Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science|
|Publication status||Published - 2019 Dec 1|
Bibliographical noteFunding Information:
This work was supported by the Ministry of Trade, Industry and Energy under Project No. 10063488. It was also partially funded by Brain Korea 21. We would like to thank Editage (www.editage.co.kr) for English language editing.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry