Characteristic of Raw Mix Packed Structure on Sinter Strand with Chute Type Feeder and Its Effect on the Sintering Reaction

Inazumi, Tadahiro; Fujimoto, Masami; Kasama, Shunji; Sato, Katsuhiko

doi:10.2355/tetsutohagane1955.77.1_63

Cited by 15 publications

(11 citation statements)

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“…A number of technologies were developed with the aim of improving sinter quality and increasing productivity, 4) including increased JIS-RI, refining of the quasi-particle structure through low SiO2-type HPS (hybrid pelletized sinter) 5) sinter ore manufacture, which achieves a reduction in coke breeze consumption and strengthening of agglomeration, 6) manufacture of low SiO2 sinter by reducing the amount of fluxes [131][132][133] (in 2001, the sinter SiO2 component was 4.86%), enhancement of the functionality of the sinter machine supply drum feeder (intensified sifting feeder, ISF), 8) air classification 9) and magnetic segregator charging, 134) selective pelletization alumina containment technology (detoxification), 11) and the stand support sinter method. 12) As a result, it became possible to increase the ratio of pisolitic ore 135) while also improving sinter strength, and in 2000, 36.4% of all imported ore (53% in the case of Nippon Steel) 4) was pisolitic ore (Fig.…”

Section: Improvement Of Sinter Qualitymentioning

confidence: 99%

“…In response to subsequent economic and environmental trends, the steel industry has taken on the role of a world leader 4) in driving technological development in various fields of the steel production process, from environment-friendly technologies such as technologies for using low-cost raw materials and reducing agents [5][6][7][8][9][10][11][12][13][14][15] (including low Si operation technology [16][17][18][19][20][21][22][23][24][25][26][27] and high rate pulverized coal injection [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] ), recycling of waste plastics, 44,45) and processing of ironmaking dust [46][47][48][49][50][51] ...…”

Section: Introductionmentioning

confidence: 99%

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Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Naito

Takeda²,

Matsui³

2015

ISIJ International

109

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The 150 year history of the Japanese steel industry dates from the first western blast furnace, which was built by T. Ohashi in 1857. Modern blast furnace operation at integrated steel works in Japan started in 1901 with the first blow-in of Higashida No. 1 blast furnace at Yawata Steel Works. Throughout the prewar and postwar periods, the steel industry has supported the Japanese economy as a key industry which supplies basic materials for social infrastructure and development.After the period of recovery following the destruction caused by World War II, Chiba Works of Kawasaki Steel Corporation (now JFE Steel Corporation) was built and began operation in 1953 as the first integrated steel works in the Keiyo Industrial Region after the war. During Japan's period of high economic growth, many coastal steel works with large blast furnaces having inner volumes of more than 3 000 m 3 and even 5 000 m 3 were built to enable efficient marine transportation of raw materials and steel products. Japanese steel makers introduced and improved the most advanced technologies of the day, which included high pressure equipment, stave cooler systems, bell-less charging systems, etc. As a result, Japanese steel works now lead the world in low reducing agent rate (RAR) operation, energy saving, and long service life of blast furnaces and coke ovens.Following the Oil Crises of the 1970s, the Japanese steel industry changed energy sources from oil to coal and implemented cost-oriented operation design and technology. In 2012, the Japanese steel industry produced approximately 80 million tons of hot metal from 27 blast furnaces, including large-scale furnaces with inner volumes over 5 000 m 3 . During this period, the industry has faced many economic and social challenges, such as the high exchange rate of the yen, oligopoly in the mining industry, global warming, and the surge in iron ore and coal prices driven by the rapid growth of the BRICs. The industry has successfully responded to these challenges and maintained its international competitiveness by developing advanced technologies for pulverized coal injection, expanded use of low cost iron resources, recycling for environmental preservation, and CO2 mitigation.In this paper, the prospects for ironmaking technologies in the coming decades are described by reviewing published papers and looking back on the history of developments in ironmaking during the last 100 years.

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Section: Improvement Of Sinter Qualitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Naito

Takeda²,

Matsui³

2015

ISIJ International

109

View full text Add to dashboard Cite

show abstract

“…As for the pre-treatment technology, technologies already developed and in actual application are selective granulation technology that partially granulates high-alumina iron ore, 1) coke breeze, and limestone coating granulation, 2) dispersant binder technology that utilizes submicron particles effectively, 3) and others. Where the technology to control the charging structure is concerned, there is charging technology to appropriately segregate sinter materials, 4) technology to suppress the contraction of the sinter bed during sintering, 5) technology to form ventilation pores in the sintering zone, 6) and others, and each of them is contributing greatly to the improvement of productivity of sintering machines in operation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Micro-particles in Iron Ore on the Granule Growth and Strength

Kawachi

Kasama

2011

ISIJ Int.

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Pelletization tests were conducted using pulverized iron ore to record changes in pellet strength by changing the volume of micro-particles and ore types. The strength of pellets when completely dried can be explained by the volume of micro-particles in ore, and the greater the volume of micro-particles, the higher the strength of pellets. The rate of increase in pellet strength by micro-particles when completely dried varies depending on the ore type of micro-particles and the strength increases in the order of pisolite, Marramamba, and hematite. Regarding the generation of pellet strength during the moisture drying process, there are two different mechanisms at work at the early stage and the last stage before complete dryness. The rise in strength at the early stage of drying is considered attributable to the increase in liquid viscosity due to the condensation of micro-particles and APD in the liquid, and the increase in strength just before complete dryness is considered attributable to the formation of solid bridges caused by the movement and rearrangement of micro-particles.

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“…(15) . This seemed to come from the fact that bigger machines had longer strand length resulting in higher feeding rate (t/h/m) that decreased vertical segregation of coke in bed; 13) an 'avalanche phenomenon' caused the decrease according to Inazumi et al 14) Since recent modification of charging equipment to intensify the segregation must have decreased the βη-H, the traditional thinking of operation that 'higher bed height, better operation' may turn to false for such machines.…”

Section: Bed Height Actionmentioning

confidence: 99%

A Differential Analysis for the Cost Minimum Operation of Iron Ore Sintering Machines

Nakano

2011

ISIJ Int.

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In order to analyze and explore the cost minimum operation in iron ore sintering, a differential equation of cost change with respect to various operational factors was derived from a constitutive formula of energy cost for a unit sinter production; and then the equation was modified to a few equations describing the cost-minimum state and determinants guiding directions for four different operational actions.As an example for the former equations, the operation under the minimum consumption ensures the relation between yield (η) and coke content (%C) like δη/δ (%C)=η/%C.The operation-guide determinants were derived for coke, bed height, bulk density and burnt lime action; then, the factors affecting the sign of each determinant were discussed. In any action case the ratio of partial costs was a critical factor to decide the direction of action. Moreover in case of bed height and burnt lime actions, the coefficient of yield with respect to bed height (βη-H) and that of bed permeation with respect to burnt lime content (βκ-BL) were critical, respectively.

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Characteristic of Raw Mix Packed Structure on Sinter Strand with Chute Type Feeder and Its Effect on the Sintering Reaction

Cited by 15 publications

References 0 publications

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Effect of Micro-particles in Iron Ore on the Granule Growth and Strength

A Differential Analysis for the Cost Minimum Operation of Iron Ore Sintering Machines

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