Reduction of FeO in Molten Slags with Solid Carbon

Abstract

Reduction of FeO in Molten Slags with Solid Carbon Masayasu SUGATA, Takashi SUGIYAMA, and Shin-ichi KONDO Synopsis; The reduction rate of FeO in molten slags by rotating carbon rod or coke rod is determined. The testing temperature is ranged from 1 350•Ž to 1 450•Ž and FeO concentration is ranged from 5 percent to 90 percent.

Reduction Kinetics of Iron Oxides in Molten Lunar Soil Simulant by Graphite

“…However, stirring removes the gas film layer from graphite rod and promotes the direct contact between simulant and graphite; namely, the total reaction changes from the apparent direct reduction to the direct reduction with an increase in the rotational speed. This model is supported by a previous work by Sugata et al, 4) who have investigated the reduction rate of iron oxides in FeO-SiO 2 melts mainly at high FeO concentrations using graphite rod rotation and shown that the direct reduction by graphite is the rate-determining step at sufficiently high rotational speeds. Enough stirring enables FeO to contact with graphite directly and the same mechanism would be in operation although the present system is different from the reported.…”

“…To extend the acceptable iron ore grade range to low grade iron ores which are not suitable for pre-sintering, the Direct Iron Ore Smelting Reduction Process (DIOS) has been recently proposed and investigated in a national project. 3) To elucidate the reaction mechanism in this kind of process, many fundamental investigations have been made on reduction behaviour of molten iron oxides by graphite [4][5][6][7][8] and Fe-C droplet, [9][10][11][12][13] and reported that the order of reaction and rate determining step strongly depend on the experimental conditions such as reducing materials and slag compositions used. The concentration of iron oxides in lunar soils is much lower than those in common iron ores on the earth and, thus, the reduction behaviour of iron oxides in SiO 2 rich slags by graphite should be further discussed.…”

Observations of the Reduction of FeO from Slag by Graphite, Coke and Coal Char

“…Studies of the effects of carbon type have concluded that the reaction rates obtained by graphite and coke are indistinguishable, 3,6,7) but that the reaction rates achieved by non-coking coals can be faster than with graphite by a factor of two. 17) The impact of carbon selection is reported to be greater at higher FeO contents, where slag phase mass transfer is more rapid.…”

Smelting Reductron Mechanism of Fe-O-S Melts Using Solid Carbon.

“…(1) to take place. In the literature [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] where the reduction of FeO in oxide melts, i.e., slag, by carbon was studied, it has been suggested that the reaction given by Eq. Suppose that the direct reduction of iron oxide by solid carbon represented by Eq.…”

“…Some previous works reported in the literature on the reduction of iron oxide in oxide melts by solid carbon support the above view. Sugata et al 8) measured the rate of reduction of iron oxide in molten slags (5-90 wt% FeO) with carbon and CO gas, and found that the reduction rate by CO gas was less than 1% of that by solid carbon at 1 350-1 450°C. Sato et al 15) also found that the reduction of iron oxide by CO was negligible in comparison with the reduction by carbon.…”