Research on Copper Matte Corrosion to Periclase - spinel Refractories

Effects of TiO2 or ZrO2 addition on corrosion resist; ance 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 chartges 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 1200 ℃ , 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.