Fig. 1 Schematic diagram of the apparatus for measurements of interfacial tension by sessile drop method.
Fig. 2 Effect of oxygen partial pressure on interfacial tensions between molten copper and fayalite slag (Fe/Si0 2=1.23) at 1473 K. Fig. s Effect or oxygen partial pressure on interfacial tensions between molten copper and fayalite slag (Fe/SiO2= 1.60) at 1473 K. Fig. 4 Effect of oxygen partial pressure on interfacial tensions between molten copper and fayalite slag (Fe/Si02= 2.02) at 1473 K.
Fig. 7 Effect of oxygen partial pressure on interfacial tensions between matte and fayalite slag (Fe/SiO2=2.02) at 1473 K. Fig. 6 Effect of oxygen partial pressure on interfacial tensions between matte and fayalite slag (Fe/SiO2=1.60) at 1473 K. Fig. 5 Effect of oxygen partial pressure on interfacial tensions between matte and fayalite slag (Fe/SiO2=1.34) at 1473 K.
Table 1 (a) Spreading and floating coefficients in copperfayalite slag system with surface tensions of copper and slag, and interfacial tensions between copper and fayalite slag. (Fe/SiO2=1.23 and 1.34) Fig. 8 Schematic presentation of Cu-matte loss into slag by gas bubble. Table 1 (b) Spreading and floating coefficients in copperfayalite slag system with surface tensions of copper and slag, and interfacial tensions between copper and fayalite slag.(fe/sio2=1.60 and 2.02) Fig. 9 Effect of oxygen partial pressure on spreading and floating coefficients in copper-fayalite slag system.
Table 2 Spreading and floating coefficients in Cu-mattefayalite slag system with surface tensions of Cu-matte and slag, and interfacial tensions between Cu-matte and fayalite slag. Fig. 10 Effect of % Cu in Cu-matte on spreading and floating coefficients in Cu-matte-fayalite slag system. Photo. 1 X-ray images of floatation of Cu-matte in fayalite slag.
Floating Behaviour of Molten Copper and Cu-matte in Cu-slag Study on interfacial phenomena in phase separation of copper smelting \ (2nd Report) \ by Takashi NAKAMURA1, Fumio NOGUCHI2, Yasuaki UEDA3 and Satoshi NAKAJYO4 Interfacial tensions in molten copper-fayalite slag and Cu-matte-fayalite slag systems have been measured by sessile drop method combined with X-ray radiophotograph. Interfacial tensions between copper and fayalite slag were found in the range of 0.8-0.6 N/m-1 at 1473 K and decreased with the increase of oxygen partial pressure at the interface. Oxygen played a role of an interfacial active element in the system. While interfacial tensions between Cu-matte and the slag were rather small at low mass% Cu in Cu-matte, they became large when mass% Cu in the matte increased. Spreading and floating coefficients in the copper-fayalite slag system were negative. On the other hand, negative spreading coefficients and positive floating coefficients were obtained in the Cu-matte -slag system. It has been understood that matte particles may be floated with gas bubbles in the slag. Floatation behaviour of matte particles with gas bubbles in the fayalite slag was able to be directly observed at 1473 K in the fayalite slag by X-ray radiophotograph technique.