Poster (EARTH)

[PE1-019] Effect of FeO_x on the liquidus line of the Al₂O₃-CaO-SiO₂-Cr₂O₃ system at 1573K

○Daiki Fujiwara², Hidehiro Sekimoto², Katsunori Yamaguchi¹ (1. Waseda University, 2. Iwate University)

Keywords:alumina refractory, erosion, phase diagram, anorthite

The shredder dust such as an automobile and a home electric appliance is treated in the copper smelting to recover the copper and precious metals in the dust. These secondary materials include combustibles components and chlorine with valuable metals. These are incinerated in rotary kiln furnace to remove combustion and the chlorine of the combustibles component. These are incinerated in rotary kiln furnace to remove combustion and the chlorine of the combustibles component. Refractory including Al₂O₃ or Cr₂O₃ is used in the rotary kiln furnace and has strong heat resistance. However, an erosion of the refractory of Al₂O₃ was sometimes observed with the FeO_x-CaO-SiO₂ slag. When we consider prolongation of human life of a furnace, A knowledge about the reaction of Al₂O₃ and the FeO_x content slag is important.
To characterize the phase equilibria relevant to the slags experimental studies have been carried out to determine liquidus lines of the FeO_x-CaO-SiO₂-Al₂O₃-Cr₂O₃ system with some fixed CaO/SiO₂ mass% ratios and 3.0mass% Cr₂O₃ at 1573 K. It was found that the influence of the addition of Cr₂O₃ is small to slag liquidus of Al₂O₃-CaO-SiO₂ ternary system. In the measurement range from 0 to 15mass% FeO_x, the liquidus line of anorthite primary phase field in the the FeO_x-CaO-SiO₂-Al₂O₃-Cr₂O₃ system does not change with the CaO/SiO₂ ratios of 0.3 to 0.6. On the other hand, the liquid phase was expanded with an increase of the FeO_x content except for 0.3 < mass%CaO/mass%SiO2 ratios < 0.6.