Abstract
This paper deals with the effect of N2 gas flow rate on the rate of Se and Te transfer from molten copper to sodium-borate slag (37.1 mass% Borax, 18.5 mass% Na2CO3, 27.8 mass% CaO, 16.6 mass% CaF2) at 1473 K. It has been found that the overall mass transfer coefficient of Se for Cu–0.228 mass% Se alloy increases from 2.04×10−5 m/s to 3.06×10−5 m/s and the overall mass transfer coefficient of Te for Cu–0.143 mass% Te increases from 3.41×10−5 m/s to 5.02×10−5 m/s with increases in gas flow rate from 5×10−6 m3/s to 17×10−6 m3/s. The overall mass transfer coefficients for Se and Te can be represented quantitatively as
kov, Se=2.346×10−4G0.20 and kov, Te=5.649×10−4G0.23
where G represents the gas flow rate (m3/s) at normal temperature (≈300 K).
