Title:
METHOD FOR CHARGING RAW MATERIAL INTO BLAST FURNACE
Document Type and Number:
WIPO Patent Application WO/2021/152989
Kind Code:
A1
Abstract:
A method for charging raw material into a blast furnace is provided which, while ensuring air ventilation inside of the furnace, enables forming an ore layer comprising an admixed coke mixture in which high reduction reactivity is maintained. This method for charging raw material into a blast furnace involves using a bell-less charging device with a charge chute, dividing a mixture of ore and a coke mixture into at least two batches, and charging into the blast furnace, wherein the ore is divided into coarse-grain ore, and a fine-grain ore that has an average diameter smaller than that of the coarse-grain ore; the coke mixture is mixed with the coarse-grain ore to obtain coarse-grain ore with admixed coke mixture, and the coke mixture is mixed with the fine-grain ore to form fine-grain ore with admixed coke mixture; and, for at least the first batch, the aforementioned charging chute is tilted from the furnace center towards the furnace wall beyond an intermediate point in the blast furnace radial direction between the furnace center and the furnace wall, charging all or part of the coarse-grain ore with admixed coke mixture.
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Inventors:
ICHIKAWA KAZUHIRA (JP)
SATO TAKESHI (JP)
YAMAMOTO TETSUYA (JP)
SATO TAKESHI (JP)
YAMAMOTO TETSUYA (JP)
Application Number:
PCT/JP2020/044357
Publication Date:
August 05, 2021
Filing Date:
November 27, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21B5/00
Domestic Patent References:
| WO2013172046A1 | 2013-11-21 |
Foreign References:
| JPH03153804A | 1991-07-01 | |||
| JPS63140006A | 1988-06-11 | |||
| JPH08120311A | 1996-05-14 | |||
| JP2015074801A | 2015-04-20 | |||
| JPH02305911A | 1990-12-19 | |||
| JP2018024914A | 2018-02-15 | |||
| JPH0754023A | 1995-02-28 | |||
| JPS60208404A | 1985-10-21 | |||
| JP2001064705A | 2001-03-13 | |||
| JP2015199979A | 2015-11-12 | |||
| JP6260288B2 | 2018-01-17 | |||
| JP6167829B2 | 2017-07-26 |
Other References:
KUNIYOSHI ANAN: "High Productivity Operation with Low Fuel Rate Using a large amount of Nut Coke", CURRENT ADVANCES IN MATERIALS AND PROCESSES, vol. 12, 1999, pages 234
YOSHIO OKUNO: "Improvement of Oilless Blast Furnace Operation by Applying Size-segregated Sinter Charging", IRON AND STEEL, vol. 69, no. 14, 1983, pages 1578 - 1584
YOSHIO OKUNO: "Improvement of Oilless Blast Furnace Operation by Applying Size-segregated Sinter Charging", IRON AND STEEL, vol. 69, no. 14, 1983, pages 1578 - 1584
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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