Abstract
The results to be found in the method of sulfur determination in cast or pig iron by the combustion way, are always somewhat low. In this research, the sources of errors to be introduced, are classified as follows: (1) The formation of aerosol from the combustion products, (2) The incomplete combustion of the sample, (3) The loss of gasses produced.
In order to consider these matters, several experiments were carried out, and the followings are recognized as the best conditions for the actual analysis. (1) Air instead of O2, should be used for combustion,(2) Clean clay boat should be used after washing to remove a clay dust, and pre-heating at 1260∼1280°C, (3) About 0.1∼0.2 g of B2O3 should be added as a flux, (4) The amount of sample taken should be 0.1∼0.2 g and the its size should be about 12∼32 mesh, (5) The dimension of the boat should be about 110×8 mm, (6) Combustion temperature should be above 1250°C, time required for combustion should be 20∼40 min, and the rate of air flow should be controlled, thus 100 ml per min at the beginning of combustion, then increase the rate of flow to 100 ml per min for each 5∼10 min, and then to 400∼500 ml per min at the finish. (7) Air should be introduced for combustion by using water-aspirator from the rear point of the train.
Applying these matters pointed out above, one of the experimental procedure was proposed, and the several results thus found were also tabulated.
