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Tetsu-to-Hagané
Vol. 54 (1968), No. 14

Tetsu-to-Hagané Vol. 54 (1968), No. 14

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ONLINE ISSN:	1883-2954
PRINT ISSN:	0021-1575
Publisher:	The Iron and Steel Institute of Japan

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Tetsu-to-Hagané Vol. 54 (1968), No. 14

随想

八木貞之助

pp. 1425-1426

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Article Title

随想

Bibtex

Ris

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

Naochika MIYASAKA, Shin-ichi KONDO

pp. 1427-1431

Abstract

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 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

Tanekazu SOMA

pp. 1431-1436

Abstract

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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The Calculation of Reduction Rate on an Ore Bed

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On the Silicon Transfer from Molten Slag to Molten Iron

Masahiro ASHIZUKA, Masanori TOKUDA, Masayasu OHTANI

pp. 1437-1446

Abstract

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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On the Silicon Transfer from Molten Slag to Molten Iron

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An Electrochemical Consideration on the Silica Reduction

Masahiro ASHIZUKA, Masanori TOKUDA, Masayasu OHTANI

pp. 1447-1456

Abstract

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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An Electrochemical Consideration on the Silica Reduction

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

Masashi MITSUTSUCA

pp. 1457-1471

Abstract

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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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

Takayuki SHINODA, Tohru MIMINO, Kazuhisa KINOSHITA, Isao MINEGISHI

pp. 1472-1486

Abstract

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

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Recent Production Technique of Coke

Hiroshi JOH

pp. 1487-1497

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Recent Production Technique of Coke

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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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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”

佐々木稔, 中沢孝夫

pp. 1504-1505

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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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抄録

pp. 1506-1511

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Tetsu-to-Hagané Vol. 54 (1968), No. 14

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Tetsu-to-Hagané Vol. 54 (1968), No. 14

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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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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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