Other

Research Institute of Industrial Science & Technology

Voest-alpine Industrieanlagenbau Gmbh

Pohang Iron & Steel Co. Ltd.

Heung Won Kang

Hang Goo Kim

Uoo Chang Jung

Jun Hyuk Lee

Sang Deuk Lee

Myoung Kyun Shin

Sang Hoon Joo

Min Young Cho

Nag Joon Choi

Sun Kwang Jeong

An apparatus and a method for manufacturing molten pig iron by using a fine iron ore are disclosed. Coal is used to produce a reducing gas, and a fine iron ore is used to produce a molten iron and a reduced iron in a simple and efficient manner. The apparatus for manufacturing a molten iron by directly using coal as the fuel is as follows. A high temperature reducing gas is sent from a melter-gasifier to a fluidized bed lime stone calcining furnace to calcine the lime stone. The reducing gas is supplied to a second fluidized bed reducing furnace so as to manufacture a reduced iron directly. An off-gas from the second fluidized bed reducing furnace is supplied to a first fluidized bed reducing furnace (disposed above the second fluidized bed reducing furnace) to pre-heat and pre-reduce the fine iron ore. The calcined lime stone and the finally reduced iron are supplied to a melter-gasifier to manufacture a molten pig iron.

Apparatus for manufacturing molten pig iron and reduced iron by utilizing a fluidized bed

A two step twin-single fluidized bed type reduction apparatus for fine iron ore, and a method therefor, are disclosed. The fluidizing of the fine iron ore is stabilized so as to improve the reduction degree and the gas utilization rate, and so as to minimize the elutriation loss of the iron ore. The apparatus includes a first fluidized bed furnace for carrying out a first pre-reduction on only coarse/intermediate iron ore particles among fine iron ores of a wide particle size distribution by a bubbling/turbulent fluidization after their charge from a charging hopper, while making fine iron ore particles fly away. A second fluidized bed furnace carries out a first pre-reduction on the fine iron ore particles flown from the first fluidized bed furnace by a bubbling fluidization, and a third fluidized bed furnace carries out a second pre-reduction on the iron ores discharged from the first and second fluidized bed furnaces after their first pre-reduction. A first cyclone captures extremely fine iron ore particles from an off-gas discharged from the second fluidized bed furnace to circulate them back to the second fluidized bed furnace. A second cyclone captures extremely fine iron ore particles from an off-gas discharged from the third fluidized bed furnace to circulate them back to the third fluidized bed furnace. A gas reforming system reforms a part of the off-gas of the first cyclone to circulate the reformed gas to the first and second fluidized bed furnaces.

Two step twin-single fluidized bed pre-reduction apparatus for pre-reducing fine iron ore, and method therefor

3-Stage fluidized bed type fine iron ore reducing apparatus having

Growing community of inventors

Kyungsangbook-do, South Korea

Heung Won Kang