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| Thermodynamics Analysis and Control of Formation of Magnesia-Alumina Spinel During Refining of Ultra-Low Oxygen |
| YANG Jun,WANG Xin-hua |
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Abstract The analysis and calculation to the formation mechanism and producing thermodynamics of magnesia-alumina spinel in refining process of ultra-low oxygen experimental steel shows that magnesia-alumina spinel can be formed when the contents of w（（MgO）） exceeds 17% in MgO-Al2O3 binary system in 1873K, and the Al2O3 inclusions can transform to magnesia-alumina spinel in front of middle period of LF refining when the aluminium deoxidation molten steel is refined by high basicity and w((CaO))/w((Al2O3))≈1 and strong reducibility top slag in LF refining. The magnesium in molten steel is the medium and bridge of realizing Al2O3 to magnesia-alumina spinel, but the w(［Mg］) is controlled by acid-soluble aluminium. Therefore keeping sufficient aluminium in molten steel is the precondition of producing magnesia-alumina spinel. Only more than 1.32×10-7 of w(［Mg］) can produce magnesia-alumina spinel when w（［Al］） exceeds 0.03% in productive process.
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Received: 06 September 2010
Published: 25 July 2011
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2011, Vol. 46 
