Abstract
The authors planned a experiment to presume the travelling time of blast furnace burden using radioisotope, 60Co. About 1mc of 60Co wire, shielded in a container of cast iron, steel or iron ore, was charged from the taphole side of the top of No. 8 or No. 10 blast furnace at Kamaishi Iron Works.
The measurement of the travelling time was carried out by counting the radioactivity of samples taken from the molten pig iron on tapping, with a scintillation counter.
It was proved that the travelling time was largely affected by the wind volume and the volume of one charge which was governed by the volume of sinter.
Besides, to ascertain the time from the arrival in the tuyere zone to the appearance in the pig iron, 0.5-1.0mc of 60Co wire was thrown into the blast furnace hearth from the tuyere. The RI thrown in from the tuyere near the taphole appeared after about 15mn. in the molten iron, but the one which had been thrown from the opposite side of the taphole took long time to appear.
