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Volume 58, Issue 11
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1979 Volume 58 Issue 11 Pages 901
Published: November 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (215K) -
Yoshiaki MIURA1979 Volume 58 Issue 11 Pages 902-914
Published: November 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis paper outlines the fundamental techniques of making blast furnace coke in a slot-type coke oven. First it deals with the softening and melting of coking coal particles, then with their expansion and resolidification, and further. with their shrinkage to form coke texture. The paper next describes the state in which coal is carbonized in coke oven chambers, by first explaining how heat is transferred in these chambers and how softening layers develop.The actual process of cokemaking is also explained with reference to blending of charging coals, their preparation and carbonization condition. Paper concludeswith a brief description of some of the latest techniques to utilize nonor poorlycaking coal, which have come to the fore recently on account of the scarcity of high quality coking coals. They are: the briquette-blend coking process, the binder addition process, the coal preheating process, and the form coke process.View full abstractDownload PDF (1993K) -
Takashi MIYAZU1979 Volume 58 Issue 11 Pages 915-925
Published: November 20, 1979
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSThis paper reviews on problems or difficulties of analysis or testing methods for coke. The main items discussed in the review are as follows.
1) The importance of sampling and sample preparation.
2) The problems on the analysis of moisture, ash and Nitrogen in cnke.
3) The evaluation of testing methods for coke using signal/noise ratio as a statistical criterion.
4) The comparison of various national standing including ISO standards for the analysis or testing of coke.
In addition, the Nos. of the above standards are summarized in the appendix.View full abstractDownload PDF (1256K) -
Tetsu NISHI1979 Volume 58 Issue 11 Pages 926-939
Published: November 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe strength of coke is an important physical property, considering the function of coke in the blast furnace. With the recent development in dissections of blast furnaces and measurement technology, increasing attention is being given to the “hot” properties of coke. This paper confines itself largely to the “cold” properties, discussing the relationship between coke structure and mechanical properties, coke strength measuring methods, with their findings, employed in various countries, and the method of estimating coke strength. Hopefully, this study will lead to such a theoretical analysis of coke strengthwhich takes into account coke size.View full abstractDownload PDF (1820K) -
Tsugio MIYAGWA1979 Volume 58 Issue 11 Pages 940-953
Published: November 20, 1979
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSFrom the standpoints of chemical constituents and reactivity to carbon dioxide, chemical properties of blast-furnace coke were reviewed.
Practically only a few analytical data such as the percent ash and total sulfur are worthy of notice now. But it will be necessary to consider other chemical properties on coke evaluation when using lower grade coals for coke making in the near future.View full abstractDownload PDF (2745K) -
Yasuo OKUYAMA1979 Volume 58 Issue 11 Pages 954-966
Published: November 20, 1979
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSThe degree of graphitization of coke is increased at higher temperature than the carbonization temperature. As the heat treatment temperature (H. T. T.) increase, the three dimension crosslinkage of layers develope to the second dimensional graphite like net structures (so called the turbostratic ones) and finally the graphite crystal structure is completed. The physical and chemical properties of coke is reviewed in the coures of graphitization at high temperature:
1) The most properties of coke is highly dependent on the H. T. T.
2) The higher H.T.T. cause the reduction of hetero atoms (S. N. P. H) making coke inert but the ash components behave sometimes as catalysts to increase the reactivity of coke at higher than 1700°C.
3) The electromagnetic properties of coke show clearly the progress of the graphitization when the H. T. T. increasing.
4) The mechanical properties of coke: The intrinsic strength, determined with such as knoop hardness, is reduced as the higher temperature. On the other hand, the structural strength is high below the carbonization temperature and over the carbonization temperature it become weak mainly due to the shrinkage.View full abstractDownload PDF (1688K) -
Mitsuru TATE1979 Volume 58 Issue 11 Pages 967-975
Published: November 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIt was tried to summarize recent informations on the behavior of coke in blast furnaces obtained mainly by dissective investigations of quenched furnaces. The general tendencier of the changes of size, strength, alkali content, reactivity, etc. of coke as it descends in the furnaces as well as their mutual relations were found. Special regard was paid to the role of the raceway and its vicinity where remarkable size-decrease or disintegration occurred. Some considerations were given to the causes of degradation in the furnace, putting emphasis on the solution loss or gasification reaction. A few informations on the behavior of formed coke involved discrepancies in themselves, which may be natural under the present situation.View full abstractDownload PDF (1289K) -
Waichiro IDZUTSU1979 Volume 58 Issue 11 Pages 976-984
Published: November 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis paper reviews on actual consumption and technical informations on foundry coke. The main items mentioned on the review are as follows:
1) Since nineteen-seventies trends toward cast iron production and foundry coke consumption in Japan are examined together with individual roles of cupola and electric furnace in foundry industries.
2) Characteristics of foundry coke and the influence of its natures to be considered on cupola operation are discussed.
3) Effect of blending materials, such as bituminous coal, anthracite, petroleum coke, coal tar pitch, etc., and influence of oven temperature are considered on manufacturing of high-grade foundry coke.
4) Procedures of drop shatter tests for foundry coke are compared among several standards, and the revisions for the test in JIS K 2151-1977 are introduced together with some latest references.View full abstractDownload PDF (1341K) -
Yoshihiko SUNAMI1979 Volume 58 Issue 11 Pages 985-993
Published: November 20, 1979
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis paper reviews the various processes of making formed coke for blast furnace and the results of the use of f ormed coke in the commercial blast furnace.
Formed coke is produced by two stage process of cold or hot briquetting and the external or internal heating depending on the properties of raw material coals.
The test in the commercial blast furnace were generally successful in proving that formed coke can replace the regular coke up to about 50%.View full abstractDownload PDF (1326K)
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