燃焼法による塩基性鋼滓中の硫黄迅速定量法

抄録

In case of trying to decompose sulphide in basic slags by means of the electric resistance heating furnace, the authors have sometimes failed to release and recover it as SO₂. It took a many time especially the high basic sample because of the strong affinity of sulphur to its matrix. So, they used the high frequency induction heating combustion apparatus to decompose the sample with pure iron in O₂ flow. Consequently, sulphur was completely decomposed and released in the flow out gas, as SO₂, which was absorbed into H₂O and caught as H₂SO₃.
Then, HC1 and starch solution were added in the absorbed water and titrated by M/1000 KIO₃.
The influence of pH, aquous temperature, combustion time and O₂ flow upon SO₂ yields were also examined. The combustion was over in 3mn. and 94% of sulphur was recovered with the aid of one absorption bottle, and 97%, two bottles. The authors examined the behavior of sulphur on the synthetic sample prepared by sulphide, sulphate and etc., and comfirmed that even high contents sample of 1% sulphur could be recovered almost stoichiometrically.
Analytical time is about 8mn. for one sample.