Study On Corrosion Mechanism Of Magnesia Chrome Refractory Materials Used In Copper Convertor

The requirements of refractory are very high in copper smelting process, becauseof the harsh working environment of refractories, such as the erosion of copper slag andmetal melt, large temperature fluctuations, the scouring of fluid and the influence ofSO2. Up to now, the refractories used in the copper smelting converter in our countryare mainly magnesite-chrome refractory. Thus, study on the damage mechanism ofmagnesite-chrome refractory is beneficial to the improvement of magnesite-chromerefractory and still achieving the object of adopting chrome-free refractory in the copperconvertor.There are many former studies on the damage mechanism of magnesite-chromerefractory used in copper smelting convertor while little study on erosion mechanism ofmagnesite-chrome refractory. Especially the research on the effect of SO2is insufficient.The needle-like MgSO4crystal is found in the residual brick in former studies. In thiswork, the effect of SO2on the copper convertor slag-resistence of magnesite-chromerefractory is studied by adding sulphur into copper converter slag in the erosionexperiment in oxidizing atmosphere. In addition, magnesia-alumina spinel and ZrO2powder were added into magnesite-chrome brick to improve copper converterslag-resistence of magnesite-chrome brick.The results indicate that the ability of resisting copper converter slag containingsulphur varies with kinds of magnesite-chrome brick because of different brick structureand chemical compositions. Adding magnesia-alumina spinel powder can improvephysical properties and copper converter slag-resistance of magnesite-chrome brick.While adding both magnesia-alumina spinel and ZrO2powder leads to the increase inporosity of magnesite-chrome brick. The resistance of FeO-SiO2slag of the brickscontaining ZrO2is excellent.