Abstract
The Yawata Iron Works have intended to practise the pig-ore process in the 100ton open hearth furnace being supplemented with the mixer for preliminary smelting.
However, owing to shortage of the capacity of the mixer, they are partly obliged to practise the ordinary pig-ore process by using the open hearth furnace alone. The author explained the pig-ore process by the parallel use of an open hearth furnace and a mixer, citing the actual operations with special reference to the control of slags which is necessary for the open hearth furnace smelting. Moreover, the author described the actual operation of redressing the hearth which plays the important role in improving the efficiency of the pig ore process, some points of improvement in the body of the open hearth furnace developed since beginning and informed experiences and results of using the mixed gas as fuel.
