低炭MgO-C质耐火材料的抗熔渣侵蚀行为

Corrosion behavior of low-carbon MgO-C refractories by molten slag

以碱度为 3.0和 1.0的钢渣对石墨含量(w)为 0、2 %、4 %、6 %和 12 %的MgO -C质试样进行了回转抗渣试验 ,并对侵蚀后试样进行了SEM、EDAX和EPMA分析。结果表明 :当石墨含量 (w)≤6 %时 ,试样在两种渣中的侵蚀深度都随石墨含量的增加而减小 ,而当石墨含量达到 12 %时 ,其侵蚀深度又都增加 ;碱度 1.0的渣对石墨含量 (w)≤ 6 %的MgO -C材料的侵蚀严重 ,而碱度 3.0的渣对石墨含量 (w)为 12 %的MgO -C材料的侵蚀严重 ;低碱度渣中Si、Fe对MgO致密层的熔损比高碱度渣中的严重。

Corrosion resistance of low-carbon magnesia-carbon refractories was investigated by rotary slag test method and the corroded specimens were analyzed with SEM,EDAX and EPMA.The contents of graphite in the prepared magnesia-carbon specimens are 0, 2%, 4%, 6% and 12% respectively.Two kinds of slags--high basicity slag with 3.0 in the ratio of CaO/SiO 2 and low basicity slag with 1.0 in the ratio of CaO/SiO 2 were selected.The results indicated the corroded depth of specimens corroded by both slags decreased with the growing of contents of graphite when the contents of graphite are not more than 6%,while it increased when the contents of graphite are 12%;and magnesia-carbon refractories with not more than 6% graphite were corroded more seriously by low basicity slag with 1.0 whereas magnesia-carbon refractories with 12% graphite were corroded more seriously by high basicity slag with 3.0,and the elements of Si and Fe in the low basicity slag corroded the MgO dense zone more seriously than that in the high basicity slag.