Research on Copper Matte Corrosion to Periclase - spinel Refractories

摘要

Effects of TiO2 or ZrO2 addition on corrosion resistance of periclase-spinel refractories to copper matte at different temperatures were investigated using static crucible method,and the results were compared with those of fused rebonded magnesite-chrome bricks.The changes in chemical compositions and microstructure in different zones of the specimens after corrosion tests were studied by means of EDAX and SEM.The results show that:(1)the reaction between periclase-spinel refractories and copper matte is very weak with the reaction layer thinner than 1 mm.Penetration is the main cause of copper matte corrosion and the penetration depth increases with temperature rising.When temperature exceeds 1 200 ℃,the penetration depth increases significantly;(2)appropriate TiO2 addition can improve penetration resistance(even better than that of magnesia chrome brick),the optimum addition is 2%.But ZrO2 has no remarkable effect on penetration resistance to copper matte of periclase-spinel refractories;(3)SEM and EDAX analysis indicates that,Cu2S penetrates much further into the specimens than FeS.