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Inhibition of Cr6+ in calcium aluminate cement bonded refractory castables using chrome-hibonite, Ca(Al,Cr)12O19 raw materials.
- Source :
-
Ceramics International . May2024:Part B, Vol. 50 Issue 9, p15561-15568. 8p. - Publication Year :
- 2024
-
Abstract
- The addition of Cr3+-oxides in a refractory provides unmatched corrosion resistance at high temperatures but generates toxic and water-soluble Cr6+ compounds, particularly in oxygen-rich and alkaline conditions. In this paper, a Cr3+ raw material (chrome-hibonite) was synthesized by the solid oxide reaction route and was used to make different calcium aluminate cement bonded alumina-based refractory castables. The castables (chrome-free and Cr3+ oxides containing) were compared regarding corrosion resistance against municipal waste slag at 1500 °C under air atmosphere. The relative Cr6+ formation within the castables containing Cr3+ oxides (Cr 2 O 3 and Ca(Al,Cr) 12 O 19) upon heat treatment at 500–1500 °C were investigated using X-ray diffraction (XRD), and Cr6+ leaching test, etc. Compared to castables without Cr3+ oxides, the corrosion resistance increases at least 5 times upon Cr3+-oxides addition, irrespective of their forms (Cr 2 O 3 or Ca(Al,Cr) 12 O 19). However, at all the tested temperatures, Ca(Al,Cr) 12 O 19 addition into the castables could suppress the Cr6+ generation significantly (below the standard solid-waste disposal limit of 3 mg/L) compared to Cr 2 O 3 , which was well above the limit. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 50
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 176100764
- Full Text :
- https://doi.org/10.1016/j.ceramint.2024.02.035