Reduction of Iron Oxide Contained in Molten Slags with Solid Carbon

Sugata, Masayasu; Sugiyama, Takashi; Kondo, Shinichi

doi:10.2355/isijinternational1966.14.88

Cited by 28 publications

(13 citation statements)

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“…During smelting reduction the reactions taking place between iron oxide containing slag and carbon can be represented by the following reactions [3] (for list of symbols, see table J): [12 ... 17] or by using a rotating carbon rod [18] the investigators found that the chemical reaction was the rate controlling step. The reaction of iron oxide reduction in the bath smelter is reportedly of the first order [19].…”

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confidence: 99%

Kinetics of smelting reduction of fluxed composite iron ore pellets

1999

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Kinetic studies on smelting reduction of unreduced fluxed composite pellets (FCP) and fluxed composite pre‐reduced iron ore pellets (FCRIP) have been carried out in an induction furnace. The pellets are charged into the slag layer floating on the carbon saturated molten iron bath in a graphite crucible. The slag basicity was however varied such that it has the same value as that of the pellets charged. The temperature of the slag is varied within the range of 1623K to 1823K for the pellets of basicity 2.0. Kinetic studies show a mixed kinetic model of both diffusion and chemical reaction controlled. While the smelting of FCRIP follows the model expressed as G(or) = 1‐(2/3)(α) ‐(1‐α)2/3, the unreduced FCP pellets initially follow the diffusion controlled model of G(α) = α2 followed by a chemical reaction controlled first order model of ‐ln(1‐α) at the latter stages of smelting reduction, where α denotes the degree of reduction. The basicity dependence on the kinetics is not very significant. Comparison of the activation energy values explains that the smelting reduction with pre‐reduced pellets seems to be a rather less energy intensive process.

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Kinetics of smelting reduction of fluxed composite iron ore pellets

1999

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“…In other studies of the reduction of FeO from slags, it has been shown [6][7][8][9] that the rates of gas phase mass transfer across the gas film between carbon and slag are substantially greater than the chemical reaction rates between gas and slag. It can, therefore, be concluded that gas phase mass transfer is not rate limiting in the present systems.…”

Section: Discussionmentioning

confidence: 98%

“…Study of these data shows that the apparent first order rate constants for oxygen removal, k O , are strongly dependent on the composition of the slag, in particular the PbO concentration (Figs. [6][7][8]10). It should also be remembered, however, that k O contains contributions for the removal of oxygen associated with both lead and iron oxides; thermodynamic analysis shows that these contributions also vary with bulk slag composition ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Since the slags contain significant concentrations of iron oxide, it is instructive to examine previous studies on systems in which FeO is the only reducible species, and draw parallels with the reduction behaviour of the mixed slag systems. Previous studies have shown that the reduction of FeO-CaO-SiO 2 slags [6][7][8][9][10][11][12] with solid carbon takes place through a series of subprocesses. These fayalite-type slags do not wet the carbon surface; the situation observed in the present study at low lead oxide concentrations.…”

Section: Discussionmentioning

confidence: 99%

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Kinetics of reduction of lead smelting slags with solid carbon

Kinaev

Jak

Hayes

2005

Scand Jof Metallurgy

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Research techniques and a methodology have been developed that enable the reduction kinetics of molten lead smelting slags with solid carbon to be studied. The rates of reduction of PbO-FeO-Fe 2 O 3 -CaO-SiO 2 slags with carbon have been measured for a range of slag compositions for PbO concentrations between 3 and 100 weight percent, and temperatures between 1423 and 1573 K. The reduction rates were determined for both graphite and coke. Within the range of process conditions examined, it has been shown that the reaction rates are almost independent of carbon reactivity, SiO 2 /CaO and SiO 2 /Fe ratio in the range of compositions investigated and are not influenced by the presence of sulphur in the slag.The apparent first order rate constants for oxygen removal increase with increasing PbO concentration and oxygen activity in the slag. The data indicate that the rate limiting reaction step for the reduction of lead slags with solid carbon is the chemical reaction at the gas/slag interface.

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“…where Wslag represents slag weight and P slag stands for slag density. As conducted for the evaluation of k~~bs in Equation (11), slag weight, Wsl ag and slag density, Pslag in Equation (12) were similarly calculated utilizing the model by Mills and Keene [9]. Therefore, the reduction rate constant of FeO, k~~o' can be evaluated by the slope of the straight Figure 4(b).…”

Section: (%P20s)mentioning

confidence: 99%

Reduction Behaviour of BOF type Slags by Solid Carbon

Jung

Choi

2006

steel research international

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Experiments were carried out on a system with artificially prepared slags in a graphite crucible, in order to examine the possibility of recycling BOF slags produced in the steelmaking process. More than 80% of FeO and P 20S was reduced within 20 minutes and the FeO reduction rate was greater than that of P 20S. P 20S reduction began after more than 60% of FeO was reduced. Increasing slag basicity enhanced the reduction of FeO and P20S. Temperature also improved slag reduction. The overall reduction rate was controlled by the chemical reaction at the slag/carbon interface. The reduction rates of FeO and P20Swere second and first order with respect to their respective contents. Most of the reduced phosphorus is believed to vaporize in the form of P 2 gas.

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Reduction of Iron Oxide Contained in Molten Slags with Solid Carbon

Cited by 28 publications

References 1 publication

Kinetics of smelting reduction of fluxed composite iron ore pellets

Kinetics of smelting reduction of fluxed composite iron ore pellets

Kinetics of reduction of lead smelting slags with solid carbon

Reduction Behaviour of BOF type Slags by Solid Carbon

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