电场作用下镁碳耐火材料在氧化性渣中的侵蚀行为
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摘要
以高温氧化性炉渣为电解质,工业MgO-C砖为阴极,钼丝为阳极,研究外电场作用下耐火材料在CaO-SiO_2-FeO三元氧化性渣中的侵蚀行为。结果表明:在CaO-SiO_2-FeO渣中,Si的还原电位约为-5.85V,Fe的还原电位约为-1.25V;当外加电压小于炉渣中离子还原电位时,电压趋使炉渣中离子(Fe~(2+),Ca~(2+))向阴极作定向移动,而SiO_4~(2-)由于离子半径大,移动速度较慢,大部分滞留在阴极区域,使得阴极附近熔渣粘度不断增加,有效降低了炉渣渗透深度;当阴极电位低于炉渣中离子还原电位时,炉渣中Fe~(2+)和SiO_4~(2-)将发生电化学还原,Fe和Si的析出促使熔渣组成发生变化,诱导高熔点相硅酸二钙沉积层的形成。高熔点沉积层有效阻断炉渣与耐火材料直接接触,使得熔渣在耐火材料中的渗透深度显著降低,提高了耐火材料抗渣侵能力。
Corrosion behavior of MgO-C refractory in molten oxide slag was investigated under applied voltage,during which MgO-C brick worked as the cathode and molybdenum as anode,..The results show that the reduction potential of SiO_4~(2-)and Fe~(2+)are about-5.85 and-1.25 Vin the CaO-SiO_2-FeO system,respectively.When the voltage is applied,ions(Ca~(2+)and Fe~(2+))move to the cathode and aggregate around the cathode.Meanwhile,SiO_4~(2-)ions move to the anode relatively slowly because of their big radius,which results in the retention of SiO_4~(2-)anions at the cathode range.If the applied voltage is less than the reduction potential of the slag,the aggregated ions can lead to viscosity increase of slag around the cathode,which hinders s the diffusion of slag into the MgO-C refractory and thus leads to the decrease in penetration depth.When the applied voltage is lower than the reduction potential of Fe~(2+)and SiO_4~(2-),metallic Si or Fe is formed,which induces a shift of slag composition toward the high melting products(Ca_2SiO_4).The high melting product layer is responsible for the good physical and chemical protection of the refractory because it blocks the direct contact between the slag and the refractory.
Corrosion behavior of MgO-C refractory in molten oxide slag was investigated under applied voltage,during which MgO-C brick worked as the cathode and molybdenum as anode,..The results show that the reduction potential of SiO_4~(2-)and Fe~(2+)are about-5.85 and-1.25 Vin the CaO-SiO_2-FeO system,respectively.When the voltage is applied,ions(Ca~(2+)and Fe~(2+))move to the cathode and aggregate around the cathode.Meanwhile,SiO_4~(2-)ions move to the anode relatively slowly because of their big radius,which results in the retention of SiO_4~(2-)anions at the cathode range.If the applied voltage is less than the reduction potential of the slag,the aggregated ions can lead to viscosity increase of slag around the cathode,which hinders s the diffusion of slag into the MgO-C refractory and thus leads to the decrease in penetration depth.When the applied voltage is lower than the reduction potential of Fe~(2+)and SiO_4~(2-),metallic Si or Fe is formed,which induces a shift of slag composition toward the high melting products(Ca_2SiO_4).The high melting product layer is responsible for the good physical and chemical protection of the refractory because it blocks the direct contact between the slag and the refractory.
引文
[1]王慧华,徐英君,蒋坤,等.外电场作用下熔渣对MgO-C耐火材料的侵蚀行为[J].材料导报:研究篇,2017,31(10):96~100.
[2]周莉,赵会峰,姜宏.高铝硅酸盐玻璃对耐火材料的侵蚀[J].材料科学与工程学报,2016,34(4):634~637.
[3]陈肇友.钢铁工业用耐火材料的发展动向[J].耐火材料,1994,28(6):309~314.
[4]陈福义,Delbert E D.铁磷和硼硅酸盐熔体对耐火材料的腐蚀性能[J].材料科学与工程学报,2001,19(3):54~59.
[5]徐匡迪.关于洁净钢的若干基本问题[J].金属学报,2009,45(3):257~269.
[6]刘浏.洁净钢生长技术的发展与创[J].中国冶金,2016,26(10):18~28.
[7]Wang D Y,Li X B,Wang H H,et al.Dissolution rate and mechanism of MgO particles in synthetic ladle slags[J].Journal of Non-Crystalline solids,2012,358:1196~1202.
[8]Kazakov A A.Influence of the electrical potential on converter smelting[J].Russian Metallurgy,1997,6(1):25~29.
[9]Siebring R,Franken M C.Effect of applied electric field on slag erosion resistance of MgO refractory[C].Proceedings of 39th International Colloquy on Refractory,Aachen,1996:32~39.
[10]Orejon D,Sefiane K,Shanahan Martin E.R.Young-Lippmann equation revisited for nano-suspensions[J].Applied Physics Letters,2013,102(20):201601~201607.
[11]Li X C,Zhu B Q,Wang T X.Effect of electromagnetic field on slag corrosion resistance of low carbon MgO-C refractory[J].Ceramics International,2012,38(10):2015~2020.
[12]Nightingale S A,Brooks G A,Monaghan B J.Degradation of MgO refractory in CaO-SiO2-MgO-FeOx and CaO-SiO2-Al2O3-MgO-FeOx liquid oxides under forced convection[J].Metallurgical and Materials Transactions B,2005,36(4):453~461.
[13]李享成,王堂玺,姜晓,等.电磁场对MgO-C耐火材料抗渣侵蚀性的影响[J].硅酸盐学报,2011,39(3):452~457.
[14]Riaz S,Mills K C,Bain K.Experimental examination of slag/refractory interface[J].Ironmaking and Steelmaking,2002,29(2):107~113.
[15]Riaz S.Effect of electric potential on mold powder behavior during solidification[J].Ironmaking and Steelmaking,2012,39(6):409~413.
[16]Riaz S,Mills K C.Can the application of electric potential increase refractory life[J].Ceramic Forum International,2002,79(3):47~50.
[17]Monaghan B J,Nightingale S A.The dissolution behavior of select oxides in CaO-SiO2-Al2O3slags[C].ⅦInternational conference on molten Slags and Salts,The South African Institute and Mining and Metallurgy,2004:585~594.
[18]Monaghan B J,Nighingale S A,Dong Q.The effect of an applied voltage on the corrosion characteristics of dense MgO[J].Engineering,2010,2:496~501.
[2]周莉,赵会峰,姜宏.高铝硅酸盐玻璃对耐火材料的侵蚀[J].材料科学与工程学报,2016,34(4):634~637.
[3]陈肇友.钢铁工业用耐火材料的发展动向[J].耐火材料,1994,28(6):309~314.
[4]陈福义,Delbert E D.铁磷和硼硅酸盐熔体对耐火材料的腐蚀性能[J].材料科学与工程学报,2001,19(3):54~59.
[5]徐匡迪.关于洁净钢的若干基本问题[J].金属学报,2009,45(3):257~269.
[6]刘浏.洁净钢生长技术的发展与创[J].中国冶金,2016,26(10):18~28.
[7]Wang D Y,Li X B,Wang H H,et al.Dissolution rate and mechanism of MgO particles in synthetic ladle slags[J].Journal of Non-Crystalline solids,2012,358:1196~1202.
[8]Kazakov A A.Influence of the electrical potential on converter smelting[J].Russian Metallurgy,1997,6(1):25~29.
[9]Siebring R,Franken M C.Effect of applied electric field on slag erosion resistance of MgO refractory[C].Proceedings of 39th International Colloquy on Refractory,Aachen,1996:32~39.
[10]Orejon D,Sefiane K,Shanahan Martin E.R.Young-Lippmann equation revisited for nano-suspensions[J].Applied Physics Letters,2013,102(20):201601~201607.
[11]Li X C,Zhu B Q,Wang T X.Effect of electromagnetic field on slag corrosion resistance of low carbon MgO-C refractory[J].Ceramics International,2012,38(10):2015~2020.
[12]Nightingale S A,Brooks G A,Monaghan B J.Degradation of MgO refractory in CaO-SiO2-MgO-FeOx and CaO-SiO2-Al2O3-MgO-FeOx liquid oxides under forced convection[J].Metallurgical and Materials Transactions B,2005,36(4):453~461.
[13]李享成,王堂玺,姜晓,等.电磁场对MgO-C耐火材料抗渣侵蚀性的影响[J].硅酸盐学报,2011,39(3):452~457.
[14]Riaz S,Mills K C,Bain K.Experimental examination of slag/refractory interface[J].Ironmaking and Steelmaking,2002,29(2):107~113.
[15]Riaz S.Effect of electric potential on mold powder behavior during solidification[J].Ironmaking and Steelmaking,2012,39(6):409~413.
[16]Riaz S,Mills K C.Can the application of electric potential increase refractory life[J].Ceramic Forum International,2002,79(3):47~50.
[17]Monaghan B J,Nightingale S A.The dissolution behavior of select oxides in CaO-SiO2-Al2O3slags[C].ⅦInternational conference on molten Slags and Salts,The South African Institute and Mining and Metallurgy,2004:585~594.
[18]Monaghan B J,Nighingale S A,Dong Q.The effect of an applied voltage on the corrosion characteristics of dense MgO[J].Engineering,2010,2:496~501.
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