Reductions of iron-oxide pellets in fixed bed and single pellet with CO gas were fundamentally studiedin order to determine the reducibilities of pellets. The results are summarized as follows.On the reduction of pellets in fixed bed with CO gas:1) Since distribution of gas concentration changed in axial direction, reduction degree of pelletbecame different between the upper and lower layer in fixed bed. As a result, critical value of gasflow was not obtained.2) Size of pellet affected largely its reducibility, then the size of sample should be selected to benarrow range of ± mm.3) Both the equation of 1st order reaction proppsed by German researchers and other equations sometimeswere satisfied with the experimental values, but they must be studied in more datail to beused as the method for indicating the reducibility of pellet.From the present experimental results, it can be concluded that method for reduction of single: pellet isto that in fixed bed because the parameters (for example, k or D) obtained from its test are able to apply the process analysis.

Pellet

10.2355/tetsutohagane1955.56.13_1594

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Citations (2)

Aresearch on the reduction equilibrium of iron oxides The 4th report:

Tetsu-to-Hagane (1948)

Koji Sanbongi

The au hor measured the e uilib ium relation among mol en iron oxide, mol en i on, and CO/CO2 mixed gas at the range of 1530°C-1670°C.From this result, the following equation was obtained for the temrerature function of Log KIn addition, the temperature function of oquilibrium conatant of the reaction, FeO(l)+H2=FeO(l)+H2O, was calculated and obtained the following equation:At the end, from these results, the author corrected the hitherto co-temperature diagram and H2-Temperature diagram.

Atmospheric temperature range

10.2355/tetsutohagane1915.34.1-3_4

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On the Activities of Coexisting Elements in Molten Iron. III : The Activity of Mn in Molten Fe-Mn Alloy

Science Reports of the Research Institutes, Tohoku University, Series A: Physics, Chemistry, and Metallurgy (1955)

Koji Sanbongi Masayasu Ohtani

Molten metal

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Citations (3)

ON ACTIVITIES OF COEXISTING ELEMENTS IN MOLTEN IRON (III)

Tetsu-to-Hagane (1954)

Koji Sanbongi Masayasu Ohtani

By constructing the following electrode concentration cell and by a potentiometer, authors measured the electromotive force corresponding to the change in the manganese content in iron:+, Fe-Mn|SiO2-MnO-CaO-MgO|Mn-The temperature of the experiment was about 1, 590±5°C and for the measurement of temperature, a Pt-Pt/Rh thermocouple was used. The theoretical relation between the electromotive force E (V) and the activity of manganese, aMn was as follows:(1)where aiMn=the activity of manganese ion in the molten slaga'Mn=the activity of pure manganesewhen pure manganese was selected so as to be in a standard state, the following equation was obtained from eq. (1):(2)n was approximately determined as n=2 by a calculation from the authors' data. From eq.(2) the activities of manganese were determined for all over the range.From the authors' result, Fe-Mn binary solution was recongnized to be approximately an ideal solution in all over the range.Judging from considerations made from several points of view, Fe-Ni and Fe-Co binary solution were also considered to follow the Raoults' law as in the case of Fe-Mn binary solution.

Electromotive force

Atmospheric temperature range

10.2355/tetsutohagane1915.40.12_1106

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Citations (10)

Thermodynamics of Ironmaking and Steelmaking Processes

Transactions of the Japan Institute of Metals (1981)

Koji Sanbongi

10.2320/matertrans1960.22.663

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Citations (4)

製鋼々滓の酸化力に關する研究(第1報) : 珪酸又は石灰飽和の酸化鐵鋼滓のα_ 測定

貢治三本木司郎渡邊 Koji Sanbongi Siro Watanabe

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Research on the Activity of Components in Fundamental System of Iron Blast Furnace Slag. II : Measurement of the Activity of Alumina in the System CaO-SiO_2-Al_2O_3

Science Reports of the Research Institutes, Tohoku University, Series A: Physics, Chemistry, and Metallurgy (1959)

Koji Sanbongi Yasuo OMORI

Slag (welding)

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Research on the Activity of Components in Fundamental System of Iron Blast Furnace Slag. IV : The Activity of Lime in the System CaO-SiO_2-Al_2O_3

Science Reports of the Research Institutes, Tohoku University, Series A: Physics, Chemistry, and Metallurgy (1961)

Koji Sanbongi Yasuo OMORI

Slag (welding)

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STUDIES OF THE SELF-FLUXING SINTER

Tetsu-to-Hagane (1958)

Koji Sanbongi Nobunao Nishida

Using Zungun ore as raw material, the specific effect of additives on the sintering processes and sinter properties were studied with a small Greenawalt-type sintering machine.Additives to the sinter mixture were lime, limestone, calcium hydrate and open hearth slag.The results obtained were as follows.(1) The beneficial effect of lime, limestone and calcium hydrate increased to a limit of 4% and finer additives were more effective.(2) For using these additives, it was understood that the moderate moisture was given the sufficient strength.(3) By using the open hearth slag, the strength of the sinter were very increased.(4) By using these additives except the open hearth slag, the reducibility of the sinter were increased.(5) From observation of mineral constituents by a microscope, it was found that composition and nature of matrix in the sinter had influenced the strength and reducibility of the sinter.

Slag (welding)

10.2355/tetsutohagane1955.44.8_853

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