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鉄と鋼
Vol. 54 (1968), No. 14

鉄と鋼 Vol. 54 (1968), No. 14

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オンライン版ISSN:	1883-2954
冊子版ISSN:	0021-1575
発行機関:	The Iron and Steel Institute of Japan

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キーワードランキング

21 Dec. (Last 30 Days)

鉄と鋼 Vol. 54 (1968), No. 14

随想

八木貞之助

pp. 1425-1426

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The Rate of Cokes Gasification by Gas Consisting of CO₂, H₂O, CO, H₂and N₂

Naochika MIYASAKA, Shin-ichi KONDO

pp. 1427-1431

抄録

The gasification of coke by carbon dioxide or steam is one of the important reactions which take place in the blast furnace. But the rate equation, which may be applied to such an atmosphere of CO₂-H₂O-O-H₂-N₂-mixture as in the blast furnace, has not been reported yet. In order to determine the rate equation applicable to such gas mixtures, the gasification rates of pulverized metallurgical coke (24-35 mesh) by CO₂-N₂, CO₂-CO, H₂O-N₂and H₂O-H₂systems were measured between 1000 and 1100°C. The experimental results led to the following expression,
(Rate of gasification)=k₁p_CO₂+k₄p_H₂O/l+k₂p_CO₂+k₃p_CO+k₅p_H₂O
where P_CO₂, P_H₂O and Pco were the partial pressures of CO₂, H₂O and CO respectively, and the constants were functions of temperature.
Some workers have reported the retardation of gasification reaction by CO and H₂, but hydrogen did not retard the reaction under our experimental conditions. The above equation may be available for the mathematical simulation of the blast furnace.

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The Calculation of Reduction Rate on an Ore Bed

Tanekazu SOMA

pp. 1431-1436

抄録

To analyze reaction in a blast furnace shaft and other reducing furnaces, a reduction rate of an are bed must be calculated. Recently many mathematical models to describe a kinetics of iron are reduction have been proposed byEl-MEHAIRY, W. M. MCKEWAN, K. Motu, W.O. PHILBROOK and others.
The are bed was divided into several unit layers. The reduction of unit layer was divided into three steps, those were wustite, magnetite and hematite reductions. The mathematical model that was proposed by K. Mori with mixed controlling step by both chemical reaction and gas diffusion, was used for each reduction step.
The calculation for the first unit time was done step by step until reaching to desired heap. Then the calculation for the second unit time was done in the same way using the degree of reduction thet had been calculated at first unit time, and so on.
The calculated data was compared with the experimental data, and these data arrived at an essential agreement. The reduction by H₂was controlled by interface reaction, but that by CO was controlled by both interface reaction and diffusion.

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On the Silicon Transfer from Molten Slag to Molten Iron

Masahiro ASHIZUKA, Masanori TOKUDA, Masayasu OHTANI

pp. 1437-1446

抄録

Some experiments on the rate of silica reduction by carbon saturated iron have been carried out in the range of 1550-1620°C and kinetics of silica reduction has been considered combining the present results with already published data by many investigators.
The results obtained are as follows:
1. The reduction of silica in a graphite crucible is promoted by the increase of slag-graphite interface area, Al addition to metal and application of external electric potential.
2. Present result and the results already published by many investigators on the silica reduction have been put in order by considering the ratio γ=S_s-G/S_s-M-. In small value of γ, the rate of reaction is pro-portional to activity of silica in CaO-SiO₂binary slag and apparent activation energy of silica reduction is about 90-100 kcal/mol. In this condition, silica reduction is controlled by chemical reaction in general but diffusion sometimes affect the rate according to the composition and transport properties such as viscosity of slag. On the contrary, in the range of γ>30 up to the present experiment diffusion step of silicate ion in slag is considered to be the limiting step.

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Effect of Addition of Ti and B on Mn-Si, Mn-Si-Cr and Mn-Si-Mo Steels

鉄と鋼 Vol.49(1963), No.2

On the Floation of Deoxidation Products by Calcium-Silicide addition

鉄と鋼 Vol.54(1968), No.4

Study on Chemical Analysis of Nonmetallic Inclusion in Steel

鉄と鋼 Vol.55(1969), No.5

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An Electrochemical Consideration on the Silica Reduction

Masahiro ASHIZUKA, Masanori TOKUDA, Masayasu OHTANI

pp. 1447-1456

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An electrochemical approach to the kinetics of multicomponent reactions occurring at the molten slagmetal interface has been proposed and applied to kinetic study of silica reduction.
1. Polarization curves of several elements dissolved in iron were evaluated from the formation free energy of oxides and available electrochemical data.
2. The limiting current density for the diffusion of SiO₂ in slag was estimated as nearly 150-400 rnA/cm² from the experimental results.
3. The facts that the rate of silica reduction is accelerated with the increase of the slag-graphite interface area was clearly explained using the polarization curves.
4. The rate of silica reduction approaches to the maximum, that is, the limiting current, under the large cathodic polarization which could be realized by the increase of slag-graphite interface area, decrease of oxygen activity or applying the external electric potential.
In this condition, the rate of silicd-(Si⁴⁺) diffusion in slag is the rate-limiting step.
Such an electrochemical approach as proposed here might be much useful for the treatments of the multicomponent reaction kinetics in iron-steelmaking processes.

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Study on the Water Spray Cooling of Steel Plate at High Tempeature

Masashi MITSUTSUCA

pp. 1457-1471

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The cooling process of plain carbon steel plate was studied. A plate of 28 × 220 × 220 mms size was heated up to 930°C and then cooled by water spray from both sides; the temperature of cooling water was 38°C. The results obtained are as follows;
1. The heat transfer coefficient α' decreases gradually as the temperature of cooled surface θsis raised when water flow rate of spray W is large, while in the case whereWis small, the coefficient decreases abruptly with the elevation of θsover 300°C.
2. The relation between α′ and W is described as “α′∝Wⁿ” in the case of W>5 × 10^-4 1/cm.2rnin, and values of n are divided into two groups according to the boiling condition of cooling water, i. e.groups of value having 03-0.5 and0.5-0.8
3. The relation between the mean heat transfer coefficient and W is described as “α∝W0.65-0.75” in the case of W>5 × 10^-41/cm2.min.
4. The relation between a and cooling water temperature θW(°C) is described as “α∝ [1-(5-8)×10-3θw]” in the case of W=0.060-%-0.062 1/crn2.min.
5. When W is large, the cooling rate V is hardly influenced by Os, but increases abruptly for 0, lower than about 500°C when W is small. Furthermore, V' decreases regardless of W, in such a temperature region that the transformation heat is evolved.
6. The relation between the mean cooling rate V- andWis described as “vcx 1470.-0.7” in the case of W=5 ×10-4-8 × 10-2 l/cm2-min.
7. The relation between V and θw(°C) is described as “V∝ [1 (4.5-5.5)× 10^-3θw]” in the case of W=0.060-0.062l/cm².min.
8. It is deduced that “spray cooling is a sort of turbulent flow cooling” from the quantitative relation between the water flow rate of spray W and heat transfer coefficient a, i. e.“α∝Wⁿ” where values ofnis about0.5-0.8.

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鉄鋼の組織・性質

鉄と鋼 Vol.52(1966), No.10

Heat Transfer Coefficients in the Surface Temperature Range of 400 to 800°C during Water-spray Cooling of Hot Steel Product

鉄と鋼 Vol.69(1983), No.2

Numerical Modeling for Cooling Process of a Moving Hot Plate by a Laminar Water Curtain

ISIJ International Vol.29(1989), No.11

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Improvement of High Temperature Strength of Type 304 Stainless Steel by Small Additions of Titanium and Niobium

Takayuki SHINODA, Tohru MIMINO, Kazuhisa KINOSHITA, Isao MINEGISHI

pp. 1472-1486

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A heat of type 304H steel which shows the highest creep-rupture strength in the tests of our laboratory has considerably iigh creep-rupture strength at long times and seems to have even higher strength than that of type 316H steel. If such 403H steel is always available, the profit m ould be expected very much to reduce the construction cost of boiler plants.
The difference of the strength in commercial heats can be explained by that of the electron microscopic structure, showing that the heat of higher strength has very fine and good distribution of M₂₃C₆type carbides and they have a resistance to coalesce to longer times-due to the presence of small amounts of titanium and niobium. An experimental heat of type 304 steel containing 0.16%C, 0-10%Ti and 015% Nb had much higher creep-rupture strength than that of type 316H steel and showed itself to be very much economical new stainless steel for high temperature use. And also it was found that at C/(Ti+Nb) atomic ratio of about 4 the maximum high temperature strength is obtained and precipitated carbides distribute themselves very finely and uniformly.

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Recent Production Technique of Coke

Hiroshi JOH

pp. 1487-1497

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Test of the Bulk Density of Coal Charge by the Large Scale Pilot Plant

Yoshio SHIRAISHI, Hiroshi JOH

pp. 1498-1503

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鉄と鋼第54年 (1968) 第12号, p.1217～1225 “焼結鉱中のCalcium Ferriteの生成について”

佐々木稔, 中沢孝夫

pp. 1504-1505

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Formation Rate of Calcium Ferrite Melt Focusing on SiO₂ and Al₂O₃ Component

ISIJ International Vol.44(2004), No.12

On the Formation of Calcium Ferrite in Sintered Ore

鉄と鋼 Vol.54(1968), No.12

Study on the Mineralogical and Metallurgical Properties of Synthetic Calcium Ferrite

鉄と鋼 Vol.55(1969), No.8

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pp. 1506-1511

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21 Dec. (Last 30 Days)

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鉄と鋼 Vol. 54 (1968), No. 14

キーワードランキング

hydrogen reduction of iron ore

gasification

characterization of coal and biomass based on kinetic parameter distributions for pyrolysis

kinetics of decarburization of liquid iron with high concentration ofcarbon

mechanisms of liquefaction and pyrolysis reaction of biomass

hydrogen reduction

steel

19al6mg

automotive wheel

deguchi

鉄と鋼 Vol. 54 (1968), No. 14

随想

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The Rate of Cokes Gasification by Gas Consisting of CO2, H2O, CO, H2and N2

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The Calculation of Reduction Rate on an Ore Bed

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On the Silicon Transfer from Molten Slag to Molten Iron

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An Electrochemical Consideration on the Silica Reduction

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Study on the Water Spray Cooling of Steel Plate at High Tempeature

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Improvement of High Temperature Strength of Type 304 Stainless Steel by Small Additions of Titanium and Niobium

SNSによる共有

Recent Production Technique of Coke

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Test of the Bulk Density of Coal Charge by the Large Scale Pilot Plant

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鉄と鋼第54年 (1968) 第12号, p.1217～1225 “焼結鉱中のCalcium Ferriteの生成について”

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Wettability of CaS against molten iron at 1873 K

凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO2-H2 Mixed Gas

In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

モデル材料を用いた凝固過程における介在物生成挙動のその場観察

Transition behavior of gas containing suspension from solid-like to liquid-like flows

A hot rolling full process rolling force prediction method based on transfer learning and Inception-LSTM neural network

Slag-steel reactions in the refining of Advanced High-Strength Steel

Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

詳細検索

The Rate of Cokes Gasification by Gas Consisting of CO₂, H₂O, CO, H₂and N₂

凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas