To prevent the generation of piled powder in a furnace caused by solid material mainly composed of carbon contained in iron manufacturing dust blown from an upper step tuyere into a coke packed layer in a vertical smelting furnace.
The solid mainly composed of carbon in the iron manufacturing dust blown from the upper step tuyere 1A is supplied by controlling the grain diameter to be not larger than the upper limit grain diameter by which the grains are ascended together with exhaust gas in a furnace top space formed on the packing layer 3 of the verticals melting furnace 1 and able to be exhausted out of the furnace top. The piling of the powdery carbon solid in the packing layer 3 of the vertical smelting furnace 1 is prevented and the gas ventilation in the furnace is improved and since the gas is smoothly exhausted out of the furnace accompanied with the ascended exhaust gas in a space of the furnace top formed on the stock line of the packing layer 3, the good operation is secured.
HARA YOSHIAKI
UCHIYAMA TAKESHI
ISHIWATARI NATSUO
Next Patent: METHOD FOR PRODUCING MOLTEN IRON USING ROTARY KILN