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Inhibition of Cr6+ in calcium aluminate cement bonded refractory castables using chrome-hibonite, Ca(Al,Cr)12O19 raw materials
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DOI：10.1016/j.ceramint.2024.02.035.png)
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Abstract
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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 degrees C under air atmosphere. The relative Cr6+ formation within the castables containing Cr3+ oxides (Cr2O3 and Ca(Al,Cr)12O19) upon heat treatment at 500-1500 degrees 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 (Cr2O3 or Ca(Al,Cr)12O19). However, at all the tested temperatures, Ca(Al,Cr)12O19 addition into the castables could suppress the Cr6+ generation significantly (below the standard solid-waste disposal limit of 3 mg/L) compared to Cr2O3, which was well above the limit.
Keywords:
Refractory monolithics
Cr 6+inhibition
Chrome-hibonite
Journal
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5.6
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5.0W
Citations:
15.5W
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