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结合首钢转炉复吹工艺,采用热模拟实验研究了复吹 CO_2条件下金属喷嘴不同材质套砖的蚀损机理。发现当使用镁白云石套砖时,由于发生[Fe]-CO_2反应,在其工作面由外向内形成 MF、(Mg,Fe)O 及其 C_2F 富集带而引起材料变质,尤其液态 C_2F 的形成,大大降低了套砖的高温强度。镁碳质套砖的蚀损则是因为工作面上形成(Mg,Fe)O 及其部分石墨被氧化,造成材料高温强度下降及抗氧化性减弱。但镁碳质套砖因 CaO 含量低,避免了 C_2F 的形成,使得其抗侵蚀能力优于镁白云石套砖。
Combined with the double blowing process of Shougang converter, the thermal damage mechanism of the brick with different materials of metal nozzle under CO 2 blowing was studied by the thermal simulation experiment. The results show that when magnesium dolomite tile is used, the material deteriorates due to the [Fe] -CO_2 reaction, forming MF, (Mg, Fe) O and its C_2F enrichment zone from the outside to the inside of the working face, especially the liquid C_2F Formed, greatly reducing the high temperature strength of the tile. The corrosion of magnesium carbon brick is because the formation of (Mg, Fe) O and part of graphite on the working surface is oxidized, resulting in the decrease of the high temperature strength and the weakening of the oxidation resistance of the material. However, due to the low content of CaO, CaO-based brick blocks the formation of C_2F, making it better than magnesium dolomite brick in its anti-erosion ability.