METHOD FOR LOADING RAW MATERIALS INTO BLAST FURNACE

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 (JP)
OGASAWARA YASUSHI (JP)
SATO TAKESHI (JP)

Application Number:

PCT/JP2019/008262

Publication Date:

October 03, 2019

Filing Date:

March 04, 2019

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C21B5/00; C21B7/18; C21B7/20; F27B1/20; F27D3/10

Domestic Patent References:

WO2013172045A1

2013-11-21

Foreign References:

JP2013147692A	2013-08-01
KR100931175B1	2009-12-11
JPH0776366B2	1995-08-16

Other References: