About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fundamentals of Sustainable Metallurgy and Materials Science
|
| Presentation Title |
Influence of Na₂SO₄ and CaSO₄ Additions on MgO-C Refractory Corrosion in Nickel Refining Ladle Slag |
| Author(s) |
Dahye Han, Yuri Kim, Min Seok Seo, Jong Ho Kim, Il Sohn |
| On-Site Speaker (Planned) |
Dahye Han |
| Abstract Scope |
With increasing nickel demand, upgrading laterite-derived ferronickel is important for producing high-value nickel feedstocks, including high-nickel matte. Na₂SO₄ and CaSO₄ generated in downstream hydrometallurgical leaching processes, has been proposed as a recyclable sulfur-bearing reagent. However, the formation of basic oxides through Na₂SO₄ and CaSO₄ decomposition may modify slag properties and threaten operating conditions by accelerating MgO-C refractory corrosion. In this study, the effects of Na₂SO₄ and CaSO₄ additions on MgO-C refractory corrosion were investigated using ferronickel ladle slag at 1550°C under an Ar atmosphere. Refractory corrosion was evaluated based on MgO content in the slag and cross-sectional morphological analyses. Both Na₂SO₄ and CaSO₄ additions accelerated slag penetration and MgO dissolution, resulting in severe corrosion and spalling. In particular, Na₂SO₄ caused more severe refractory corrosion than CaSO₄. Therefore, additive additions should be controlled within a specific operating window to balance nickel refining efficiency and refractory stability. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Pyrometallurgy, Recycling and Secondary Recovery, Other |