Experimental Study On Erosion Behavior Of Magnesia Carbon Ladle Refractory

Slag lining zone is the key position of the erosion of ladle refractory.Its erosion behavior is vital to the lifetime of ladle and the safety production of iron and steel enterprises.In this paper,the erosion behavior of magnesia carbon brick is studied by means of in-situ sampling analysis and high temperature simulation experiments.The effects of slag composition,rotation rate,reaction temperature and other factors are mainly investigated.Under the experimental conditions employed in this work,the main conclusions are as follows:(1)The mineral phases in the working layer of magnesia carbon brick significantly changed during its service period.Periclase and graphite are the original main phases of the magnesia carbon brick,and a low melting point monticellite exists in the periclase.After service period,the graphite phase in the working layer of magnesia carbon brick cannot detected,and the new phase of forsterite and magnesia-alumina spinel were formed.(2)The slag composition could affect the erosion behavior of magnesia carbon brick.The erosion of magnesia carbon brick became more serious with the increasing FeO content.When the FeO content were 1%,5%and 15%,the erosion depth of magnesia carbon brick were 0.47mm,0.48mm and 0.51mm,respectively.(3)The rotation rate has a significant effect on the erosion behavior of magnesia carbon brick.When the rotation rate elevated from 0rpm to 180rpm,the erosion depth of magnesia carbon brick increased from 0.28mm to 0.51mm.(4)With the increase of temperature,the fluidity of slag and the reaction between slag and magnesia carbon brick are improved.When the temperature increased from 1550? to 1600?,the erosion depth of magnesia carbon brick rose from 0.48mm to 0.53mm.(5)The erosion of magnesia carbon bricks after a pre-decarburization treatment was more serious.The erosion depth of sample without pre-decarburization treatment was 0.28mm,and that after a pre-decarburization was 1.70mm.