Open AccessCharacterization and reduction behavior of carbon-infiltrated goethite ore by impregnation of tar recovered from coke oven gas
Author(s) -
A. Hariyadi,
Rochim Bakti Cahyono,
Suryo Purwono
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/572/1/012043
Subject(s) - goethite , coke , iron ore , carbon fibers , blast furnace , tar (computing) , pyrolysis , metallurgy , materials science , mesoporous material , adsorption , desorption , bet theory , chemical engineering , chemistry , catalysis , composite material , composite number , organic chemistry , computer science , engineering , programming language , biochemistry
The Iron/Steel industry is currently facing serious problem due to excessively dependent on metallurgical coke, which is produced a large amount of CO 2 emission and it was limited source in Indonesia. Coke-free iron-making is one of the efficient method to reduce the amount of cokes. Carbon-infiltrated iron ores were prepared by impregnation process from coaltar solution and goethite ore at 500 °C and 600 °C to promote direct reduction in iron making. These variables were systematically characterized by XRD and SEM/EDX. Pore distribution and BET surface area were determined by N 2 adsorption-desorption measurement. The XRD signals attributed to Fe 2 O 3 in the goethite ore were completely disappeared and replaced by signals attributed to Fe 3 O 4 after impregnation process. Cross-sectional analyses of composite particles prepared using both temperatures showed that tar-derived carbonaceous materials have completely either impregnated or vapor infiltrated into the mesoporous in pyrolyzed goethite ore. Carbon-infiltrated goethite ore showed a higher reduction degree than conventional coke. It is confirmed that high reactivity of carbon-infiltrated iron ores is due to close contact between the goethite ore and carbon in its nanoporous interior facilitated the fast reduction.