High Temperature Corrosion Mechanisms of Refractories and Ferro-Alloy Slags

Luidold, Stefan; Wenzl, Christine; Wagner, Christoph; Sagadin, Christoph

doi:10.1007/978-3-319-48769-4_5

Cited by 1 publication

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the manufacture of ferronickel, temperatures of more than 1650°C and high acidic slags are typical for the smelting process, which stresses the ceramic magnesia refractory despite its high melting point, good mechanical properties at elevated temperatures and ability to withstand hostile conditions. [2][3][4][5][6][7][8] According to Hu,9 basic magnesia refractory material has a higher resistance performance than acidic refractories in the ferronickel process despite the acidic slags. In detail, FeO and MgO form a substitution solid solution resulting in a decreased FeO content in the slag system.…”

Section: Introductionmentioning

confidence: 99%

Phase Reactions Between Refractory and High-Acidic Synthetic CaO-Ferronickel Slag

Sagadin

Luidold

Wagner³

et al. 2017

JOM

Self Cite

View full text Add to dashboard Cite

Interactions between high melting synthetic ferronickel slags with acidic character and MgO as refractory were investigated. In order to facilitate the complex composition of real ferronickel slag, a synthetic slag of SiO 2 -MgOFe 2 O 3 -CaO was used. The practical corrosion tests of the MgO refractory were performed in a hot-stage microscope at temperatures of 1650°C under a CO/ CO 2 atmosphere for process-oriented conditions. The formed phases between slag and magnesia substrate were analyzed by scanning electron microscope analysis. The results show that, by penetrating the slag into the refractory, the melt dissolves the magnesia and forms Mg-and Ca silicates. Furthermore, a diffusion of Fe from the slag into the magnesia grains can be observed and a transformation to magnesiowustite occurs. Thermodynamic phase calculations using FactSage software confirmed the generation of these minerals. The combination of practical testing and thermodynamic calculations should ultimately provide a path for improving the refractory lifetime and performance.

show abstract