PbO, Na₂Oを含む溶融ケイ酸塩の電気伝導度測定

抄録

The electrical conductivity of molten slag was measured by many researchers but their results are not always consistent.
Reinvestigation is therefore necessary to clarify the reason of disagreement.
The results obtained are as follows:
(1) The true resistance of the electrolyte R_T, was calculated by the equation, R_m=R_T+ΔR, where R_m is the measured resistance. ΔR depends on the frequency, f, in the relation, ΔRα1⁄fⁿ, in which n is nearly 1.0 for 0.1 D KCl aq. solution, KNO₃ and KCl salts, Na₂O-SiO₂ melts and varies from 0.5 to 0.8 for PbO-SiO₂ melts. Therefore, the true resistance of the melts is obtained only by the extrapolation to infinite frequency.
(2) The cell constants measured at 15°∼30°C, 350°∼500°C and 850°∼900°C with 0.1 D KCl aq. solution, KNO₃ salt and KCl salt, respectively, were nearly equal within the experimental error.
(3) For PbO-SiO₂ melts, the effect of ΔR on the electrical conductivity is remarkable with the increase of PbO concentration and temperature, Log k did not show a linear relation with 1⁄T in the range of low PbO concentrations.
(4) The electrical conductivity of Na₂O-SiO₂ melts obtained by the extrapolation to infinite frequency was higher than those of previous researchers and the result at 1 KHz was almost similar to that of Mori-Matsusita.
There was no effect of atmospheres of the cell on the electrical conductivity for the slags used.