Reduction of FeO in smelting slags by solid carbon: Experimental results

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/BF02915600· OSTI ID:404373

Sarma, B; Cramb, A W; Fruehan, R J ^[1]

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1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Metallurgical Engineering and Materials Science

The reduction of CaO-SiO{sub 2}-Al{sub 2}O{sub 3}-FeO slags containing less than 10 wt pct FeO by solid carbonaceous materials such as graphite, coke, and coal char was investigated at reaction temperatures of 1,400 C to 1,450 C. The carbon monoxide evolution rate from the system was measured using stationary and rotating carbon rods, stationary horizontal carbon surfaces, and pinned stationary spheres as the reductants. The measured reaction rate ranged from 3.25 {times} 10{sup {minus}7} mol/cm s at 2.1 pct FeO under static conditions to 3.6 {times} 10{sup {minus}6} mol/cm s at 9.5 pct FeO for a rotating rod experiment. Visualization of the experiment using X-ray fluoroscopy showed that gas evolution from the reduction reaction caused the slag to foam during the experiment and that a gas film formed between the carbon surface and the slag at all times during experimentation. The reaction rate increased with increased slag FeO contents under all experimental conditions; however, this variation was not linear with FeO content. The reaction rate also increased with the rotation speed of the carbon rod at a given FeO content. A small increase in the reaction rate, at a given FeO content, was found when horizontal coke surfaces and coke spheres were used as the reductant as compared to graphite and coal char. The results of these experiments do not fit the traditional mass transfer correlations due to the evolution of gas during the experiment. The experimental results are consistent, however, with the hypothesis that liquid phase mass transfer of iron oxide is a major factor in the rate of reduction of iron oxide from slags by carbonaceous materials.

• Sponsoring Organization: USDOE
• OSTI ID: 404373
• Journal Information: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science Journal Issue: 5 Vol. 27; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ACTIVATION ENERGY
CHARS
CHEMICAL REACTION KINETICS
COKE
COMBUSTION
EXPERIMENTAL DATA
GRAPHITE
IRON OXIDES
REDUCTION