METHOD FOR BLOWING POWDER

PURPOSE:To blow different kinds of powders into a blast furnace in a uniformly mixed state by passing pulverized coal and iron oxide or reduced iron through a mixer composed essentially of outer and inner pipes to mix them and by feeding the mixture to a conveying pipe. CONSTITUTION:Iron oxide or reduced iron and pulverized coal are alternately fed to intermediate tanks 3, 4, dropped into blowing tanks 5, 6, passed through conveying pipes 7, 8 and sent to a mixer 9. The iron oxide or reduced iron is introduced into the mixer 9 from the pipe 7 through the inner pipe 14 and the pulverized coal is introduced into the mixer 9 from the pipe 8 through the inflow pipe 19. In the mixer 9, mixing is carried out as if the iron oxide or reduced iron is wrapped in the pulverized coal. The mixture is fed to a conveying pipe 10 from the open end 16 of the outer pipe 15, evenly distributed with a distributor 11 and blown into a blast furnace 13 from a tuyere 12.