Abstract
Several slags were potentiometrically titrated in molten potassium nitrate. The sample was allowed to react with a definite amount of potassium dichromate in the melt at 400°C, and then the excess dichromate was titrated back with the weighed portions of potassium carbonate. An antimony rod was used as the indicator electrode, and a Pt/Pt (II) couple in a eutectic mixture of LiCl-KCl asthe reference electrode. The potential break through the end-point was 0.2-0.3V, and reproducible results could be obtained for each slag sample. The amounts of the acid consumed by the slags were compared with the basicities of the samples, which were calculated from various methods. Almost linear relationship could be obtained between the amounts of the acid required and the following basicities based on the chemical analyses of the samples; they are lime-silica ratio, V-ratio, basicity ratio, the basicity by KERLIE and the basicity by MORI.
