Corrosion of Alumina-Spinel Refractory by Secondary Metallurgical Slag Using Coating Corrosion Test

Darban, Sina; Reynaert, Camille; Ludwig, Maciej; Prorok, Ryszard; Jastrzębska, Ilona; Szczerba, Jacek

doi:10.3390/ma15103425

Cited by 6 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the analysis of thermodynamic simulation, it can be found that the high melting point phase CaAl 4 O 7 is the critical point in enhancing the slag resistance of the crucible [ 37 , 38 , 39 , 40 ]. The maximum content of the CaAl 4 O 7 of the CA 6 , Al 2 O 3 , and CA 6 -Al 2 O 3 crucible is 49.04%, 34.18%, and 40.11%, respectively, through the thermodynamic simulation results, which the trend is consistent with the EDS results.…”

Section: Resultsmentioning

confidence: 99%

Reaction Mechanism of CA6, Al2O3 and CA6-Al2O3 Refractories with Refining Slag

Liu

Feng³

et al. 2022

Materials

View full text Add to dashboard Cite

In this study, to clarify the corrosion mechanism of CA6 based refractory by refining slag, the static crucible tests for CA6, CA6-Al2O3, and Al2O3 refractory, were carried out and the detail reaction processes were analyzed from the perspective of thermodynamic simulation and structural evolution. From the results, CaAl4O7 plays a vital role in the slag corrosion resistance of the three refractories. Regarding CA6 refractory, the double pyramid module in CA6 crystal structure was destroyed very quickly, leading to the rapid collapse of its structure to form the denser CaAl4O7 in high amounts. As a result, a reaction layer mainly composed of CaAl4O7 formed, which effectively inhibited the slag corrosion, so CA6 refractory exhibits the most excellent slag corrosion. Meanwhile, the formation of CaAl4O7 can also avoid CA6 particles entering the molten steel to introduce exogenous inclusions. For Al2O3 refractory, the generation of CaAl4O7 is much slower than that of CA6 and CA6-Al2O3 refractory, and the amount generated is also quite small, resulting in its worst slag corrosion among the three crucibles. Therefore, CA6 based refractory has excellent application potential in ladle refining and clean steel smelting.

show abstract

Section: Resultsmentioning

confidence: 99%

Reaction Mechanism of CA6, Al2O3 and CA6-Al2O3 Refractories with Refining Slag

Liu

Feng³

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…Darban et al [15] revealed the corrosion of an alumina-spinel refractory against secondary steel slag via a coating corrosion test at 1350 • C and 1450 • C. They summarized the study by showing the passive corrosion mechanism of the refractory, with the formation of CA, CA 2 and CA 6 layers around the Al 2 O 3 core and C 2 AS in the matrix.…”

Section: Corrosionmentioning

confidence: 99%

Design, Manufacturing and Properties of Refractory Materials

Jastrzębska,

Szczerba

2024

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Various types of calcium aluminate phases exist, such as C 3 A, C 12 A 7 , calcium monoaluminate (CA), calcium dealuminate (CA 2 ), and calcium hexaluminate (CA 6 ) [29,30], some of which can absorb sulfur. According to S. Kim et al [31], different calcium aluminate phases exhibit different sulfur capacities, with C 12 A 7 and C 3 A demonstrating superior performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different CaO/Al2O3 Ratios on the Phase Composition and Desulfurization Ability of CaO-Based Desulfurizers in Hot Metal

Shen,

Lin,

Chang

et al. 2024

Metals

View full text Add to dashboard Cite

In response to the development of low-carbon smelting technology, reducing the use of fluor-containing materials in desulfurizers is an important research topic. The development of new-generation KR (Kambara Reactor) desulfurizers is shifting towards a higher Al2O3 content rather than CaF2, yet there is currently an absence of thorough and comprehensive mechanisms for desulfurization. Consequently, this research provides an extensive comparison using a specially constructed small-scale KR desulfurization hot model test, alongside FactSage simulation and SEM analysis (of desulfurization process). The findings indicate that at 1400 °C, for the desulfurization of molten iron, the capacity for desulfurization initially increases and then diminishes as the Al2O3 content in the KR desulfurizer rises. With Al2O3 content in the desulfurizer below 22 wt.%, the phase composition predominantly consists of C3A, employing a solid(slag)–liquid(metal) diffusion method for desulfurization. The optimal desulfurization capacity (Ls: 64.1) is observed when the Al2O3 content is 15 wt.%, attributed to the simultaneous presence of CaO particle precipitation and C3A. However, as the Al2O3 content reaches 20 wt.%, all the oversaturated CaO integrates into C3A, leading to a reduction in Ls from 64.1 to 10.7, thereby diminishing the desulfurization capacity by approximately sixfold. When Al2O3 exceeds 22 wt.%, the phase composition transitions from the C3A to C12A7 phase, and the desulfurization approach shifts from solid(slag)–liquid(metal) to liquid(slag)–liquid(metal) diffusion, with Ls decreasing to 23.4. This reduction is due to C12A7’s lower sulfur capacity compared to C3A and the absence of saturated CaO particle precipitation. Therefore, for Al2O3 to effectively replace fluorite in KR desulfurizers, a higher presence of C3A phases and CaO particle precipitation are essential. The desulfurizer must contain over 65 wt.% CaO and maintain Al2O3 levels at 10~16.2 wt.%.

show abstract

Corrosion of Alumina-Spinel Refractory by Secondary Metallurgical Slag Using Coating Corrosion Test

Cited by 6 publications

References 23 publications

Reaction Mechanism of CA6, Al2O3 and CA6-Al2O3 Refractories with Refining Slag

Reaction Mechanism of CA6, Al2O3 and CA6-Al2O3 Refractories with Refining Slag

Design, Manufacturing and Properties of Refractory Materials

Effects of Different CaO/Al2O3 Ratios on the Phase Composition and Desulfurization Ability of CaO-Based Desulfurizers in Hot Metal

Contact Info

Product

Resources

About