Fundamental Investigation on Production Conditions of New Iron Ore Agglomerates for Blast Furnace Burdens and Evaluation of Their Properties

Sakamoto, Noboru; Noda, Hidetoshi; Iwata, Yoshihito; Saitô, Hiroshi; Miyashita, Tsuneo

doi:10.2355/tetsutohagane1955.73.11_1504

Cited by 23 publications

(11 citation statements)

References 3 publications

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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

110

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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

110

View full text Add to dashboard Cite

show abstract

“…Sinters (A)-(C) were produced by actual sintering machines with different operating conditions, and sinter (D) was prepared with a laboratory-scale experimental sintering machine simulating the Hybrid Pelletized Sinter (HPS) process 9,10) and contains 40 wt% of pellet feed with a high T.Fe content. Table 1 shows the chemical composition, JIS-RI, 11) and JIS-RDI 12) of sinters (A)-(D).…”

Section: Sinter Properties and Reducing Gas Conditionsmentioning

confidence: 99%

Evaluation of Sinter Quality for Improvement in Gas Permeability of Blast Furnace

Takeuchi

Iwami²,

Higuchi³

et al. 2014

ISIJ Int.

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In the recent operation of blast furnace, it is supposed that high gas permeability of burden is important for low RAR and high PCR operation. In this work, sinter quality for improvement in gas permeability of blast furnace was investigated with reduction degradation and under-load-reduction tests. As the results, the reduction degradation of sinter is deteriorated by increasing H2 concentration in the reduction gas under the condition of below 3.8 vol% H2. However, over 3.8 vol% H2, increase of H2 has no effect on the reduction degradation because the diffusion of reduction gas in the sinter is limited. On the other hand, from the under-load-reduction test, there is possibility that increase in H2 concentration of reduction gas and decrease in slag ratio in sinter are effective to improve gas permeability of lower part of blast furnace rather than reducibility of sinter. Due to adoption of these experimental results to a 2-dimentional mathematical simulation model, the precision of pressure drop calculation of blast furnace was improved. It is considered from the evaluation by this model calculation that the RDI, a slag ratio and the slag viscosity as the sinter properties are greatly influence on the permeability of blast furnace.

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“…The principal improving reducibility includes 1) small diameter the burden has 2) enough porosity and suitable distribution of pore diameter for maintaining gas diffusion up to elevated temperature, 3) close positioning of carbon to iron oxide. An agglomerate consisting of small pellets like HPS 1) satisfies the first condition; cold-bond pellet features higher reducibility mainly owing to higher porosity 2) ; cold bonding method also realizes the third condition as a carbon-iron oxide composite pellet.…”

Section: Introductionmentioning

confidence: 99%

Non-spherical Carbon Composite Agglomerates: Lab-scale Manufacture and Quality Assessment

et al. 2004

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Fundamental Investigation on Production Conditions of New Iron Ore Agglomerates for Blast Furnace Burdens and Evaluation of Their Properties

Cited by 23 publications

References 3 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

Evaluation of Sinter Quality for Improvement in Gas Permeability of Blast Furnace

Non-spherical Carbon Composite Agglomerates: Lab-scale Manufacture and Quality Assessment

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