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对某钢厂LF精炼钢包渣线服役前后的镁碳砖进行理化分析、扫描电镜(SEM)-能谱分析(EDS)、Factsage热力学计算、润湿性分析等,研究了镁碳砖的侵蚀机理。研究表明,镁碳砖在钢包内不同的服役温度区域及其自身内部的不同组织结构造成其损毁及侵蚀机理的不同。在近钢液面的高温区域,镁碳砖自身会发生MgO与碳的反应,形成脱碳层。高温下熔渣与镁碳砖的润湿性更好且MgO向熔渣溶解的趋势更大,相比近空气侧的低温区域,镁碳砖受熔渣侵蚀更严重。镁碳砖中,不同MgO骨料颗粒其内部杂质相及组织结构有一定区别。熔渣与镁碳砖中的MgO组元间的润湿性较好,熔渣易对杂质相多、MgO晶粒尺寸较小的骨料进行侵蚀,且易沿MgO晶界渗入MgO骨料内部,造成MgO骨料颗粒的解离并进一步发生反应生成Mg2 SiO4。熔渣与镁碳砖之间的氧化还原反应也是其损毁的成因之一。
The carbonized bricks before and after the service of LF refining ladle slag line in a steel mill were studied by means of physical and chemical analysis, scanning electron microscope (SEM) -spectral analysis (EDS), Factsage thermodynamic calculation and wettability analysis. . The research shows that the different service temperature zones of magnesium carbon brick in the ladle and the different internal structures of the ladle result in different damage and erosion mechanisms. In the high temperature zone near the molten steel surface, MgO itself will react with carbon to form a decarburized layer. The wetting of slag and magnesia-carbon brick is better at high temperature and MgO tends to dissolve to the slag more. Compared with the low-temperature area near the air side, the magnesia-carbon brick is more seriously attacked by slag. Magnesia carbon brick, different MgO aggregate particles of its internal impurity phase and the structure of a certain difference. The wettability between slag and magnesia-carbon brick in MgO is better. The slag is easy to erode the impurities and MgO with smaller grain size, and easily penetrate into the MgO aggregate along the grain boundaries of MgO , Resulting in the dissociation of MgO aggregate particles and further reaction to Mg2SiO4. The redox reaction between slag and magnesia-carbon brick is also one of the causes of its damage.