不同条件下白云石耐火材料抗侵蚀性的研究  

Slag resistance of dolomite refractories under different conditions

作　　者：王龙光[1] 李红霞[1] 徐延庆[1] 杨彬[1] 张立明[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院,洛阳471039

出　　处：《耐火材料》2006年第6期410-414,418,共6页Refractories

摘　　要：采用真空感应炉法与静态坩埚法,分别研究了烧成白云石耐火材料在碱度为0.6、1.1、1.5和1.8的CaO-SiO2渣与Al2O3含量为37.98%的CaO-Al2O3渣中的抗侵蚀性。真空感应炉浸棒法的试验条件是真空度5kPa、1650℃保温25min;静态坩埚法的试验条件为空气气氛下于1650℃保温60min。对侵蚀后的试样进行观察与测量,并用SEM与EDAX分析了试样的断面形貌和化学组成变化。结果表明,在静态坩埚法抗渣试验条件下,在CaO-SiO2渣中,随着熔渣碱度的升高,试样与熔渣生成高熔点的C2S保护层,阻挡了熔渣的侵蚀,表现出较好的抗侵蚀性。在真空感应炉浸渍试样的试验中,在CaO-SiO2渣中,随着熔渣碱度的升高,试样抗侵蚀性呈现出先增强后减弱的趋势;在CaO-Al2O3渣中,试样侵蚀后形成低熔点的C12A7,试样的抗侵蚀性很差。The corrosion resistances of dolomite refractories to CaO - SiO2 slag with the basicity of 0.6,1.1,1..5 and 1.8 and CaO - Al2O3 containing 3？. 98% Al2O3 were studied by dynamic slag corrosion test in vacuum induction furnace and static crucible method respectively. The crucibles （Ф40 mm ×40 mm） prepared with dolomite bricks containing different slags were heated to 1650℃for 60 min in air, and the bar specimens （3.5 mm ×35 mm ×220 mm） were dipped into molten slag and steel at 1650 ℃ for 2.5 min in vaccum induction furnace （pressure .5 kPa）. The specimens after corrosion test were observed and measured,and their cross-section microstructures were observed by SEM and chemical compositions of the corrosion layer and transition layer were analyzed by EDAX. The result shows that：in the static crucible test,the specimens have better corrosion resistance to CaO -SiO2 slags with higher basicity because the protection layer or C2S with high melting point forms in the reaction between specimen and molten slag preventing the further penetration of slag. In the vacuum induction test, the corrosion resistance to CaO -SiO2 slag firstly increases and then declines with the increase of slag basicity, and when basicity is 1.1 ,the specimen has the best resistance. However since much more C12A7 with low melting point（1477 ℃） formed in reaction layer,the specimen was corroded seriously by CaO -SiO2 slag.

关 键 词：白云石耐火材料 抗侵蚀性 真空感应炉 静态坩埚法 

分 类 号：TQ175.79[化学工程—硅酸盐工业]