In order to investigate the behaviour of impurities in tin smelting, distribution coefficient of impurities (As, Bi, Cu, Pb, Sb) was measrued at 1523˚K and activity
coefficient of impurities was evaluated by using the distribution coefficients.
The r...
In order to investigate the behaviour of impurities in tin smelting, distribution coefficient of impurities (As, Bi, Cu, Pb, Sb) was measrued at 1523˚K and activity
coefficient of impurities was evaluated by using the distribution coefficients.
The results this experiment are as follows;
1. The distribution coefficient of impurities between metal and slag decreased with increasing FeO content in slag (xFeO-yCaO-zSiO_2), whereas that of impurities showed nearly constant above 30% FeO. In tin smelting, thereore, CaO-rich slag was effective for the removal of impurities.
2. The activity coefficient of impurities which is derived from this experimental results was as follows; r˚_AB=0.006~0.056, r˚_Bi=0.010~0.045, r˚_Cu=1.98~5.62, r˚_pb=0.37~1.62, r˚_Sb=0.08~0.82.
3. The distribution coefficient of impurities linearly decreased with increasing temperature.