The Study Of Corrosion Mechanism Of Refractory Used In Copper Converter Furnace

The resistances of refractories to slag were also studied and compared by the method of stationary crucible. By means of OM and X-ray, the microstructural changes of the specimens before and after stationary crucible testing were examined and the corrosion mechanism of the slag to the refractories was discussed. The results show: that: (1) The influence of temperature on the slag resistance of refractoris is very significant. With the increase of temperature, the slag's erosion to refractories increases; (2) The slag reacts with the periclase in refractories, which results in the dissolving of periclase in fayalite slag, That is the main characteristic of the corrosion mechanism of the slag to magnesia chrome refractories, As far as integral performance of the refractories used in the Copper Converter furnace is concerned: silicate magnesite-chrome brick < direct-bonded magnesite-chrome brick < semi-rebonded magnesite-chrome brick < fused grain rebounded magnesite-chrome brick.In this paper, the influences of sesquioxide (Al2O3, Cr2O3, Fe2O3) on properties of the magnesia chrome refractories were studied . The results show that: (1) as the Al2O3 content increases, the bulk density, the thermal shock resistance, and the high-temperature strength of the magnesia chrome bricks will increase, and the apparent porosity will decrease; (2) with the increase of Cr2O3 (chromite) content, the apparent porosity and the thermal shock resistance of the magnesia chrome bricks will increase, while the high-temperature strength and the bulk density will decrease; (3) with the increase of Fe2O3 content, the apparent porosity of the Magnesia chrome bricks will increase, while the bulk density, the thermal shock resistance and the high-temperature strength will decrease. Therefore, to increase the Al2O3 content and to decrease the Fe2O3 content of the magnesia chrome bricks will improve the performance of the magnesia chrome bricks, will prolong the service life of magnesiachrome bricks.The influences of additive (ZrO2) on the magnesia chrome refractory properties are also investigated, and characteristic of additive (ZrO2) in the magnesia chrome bricks are analyzed further. The results show that the mechanical properties of the magnesia chrome bricks will be improved by adding the additive.In the paper, the research outcome has a instructive impromance to the study and production of Cr-Al-Zr brick ( 90 % ). We can come to a conclusion from practice : Cr2O3 and ZrO2 can improve obviously the high- temperature performance and the service life of the magnesia chrome bricks.