Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD FOR LOADING RAW MATERIALS INTO BLAST FURNACE
Document Type and Number:
WIPO Patent Application WO/2019/187998
Kind Code:
A1
Abstract:
Provided is a method for loading raw materials into a blast furnace that makes it possible to efficiently reduce low-reactivity ore and to effectively stabilize the reduction state of ore within a furnace even when normal coke is used in a blast furnace comprising a bell-less loading device. The method is for loading raw materials into a blast furnace provided with a bell-less loading device that comprises a plurality of main hoppers at the furnace top and an auxiliary hopper having a smaller capacity than the main hoppers. When ore (x) that has a JIS reduction rate (RI) greater than 55% and that is loaded into one or more of the plurality of main hoppers is discharged and sequentially loaded from a furnace center side to a furnace wall side by a rotating chute, only ore (x) is loaded from the rotating chute after starting loading of the ore (x) until loading of at least 45 mass% of the total amount of the ore (x) to be loaded in one batch is completed, the discharge of low-reactivity ore (y) that has a JIS reduction rate (RI) of 55% or less and that has been loaded into the auxiliary hopper is subsequently started from a discretionary point in time, and ore (x) and low-reactivity ore (y) are subsequently loaded from the rotating chute during a discretionary period.

Inventors:
ICHIKAWA Kazuhira (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
OGASAWARA Yasushi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
SATO Takeshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
Application Number:
JP2019/008262
Publication Date:
October 03, 2019
Filing Date:
March 04, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
International Classes:
C21B5/00; C21B7/18; C21B7/20; F27B1/20; F27D3/10
Foreign References:
JP2013147692A2013-08-01
KR100931175B12009-12-11
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JFE Techno-Research Corporation 7-1, Otemachi 2-chome, Chiyoda-k, Tokyo 04, 〒1000004, JP)
Download PDF: