Dissection of Blast Furnaces and Their Internal State

Abstract

For the purpose oj illl'estigatillg the illtemal state oj a blast Jumace ill olleratioll, H igashida No.5 B .F. ha villg the illller volume oj 646 m" was water-quenched while ill a lIormal operatillg cOlldilioll alld dissected ill 1968. This was the first attempt to dissect a commercial blast Jumace in J apall. Hirohata No. I B.F. with the ;/11le, volume oj 1-107 m" which had beell operated with cOllsiderably high productivity, was lIext dissected ill 1970. Theil , Kukioka No. 4 B.F. havillg the illller volume oj I 279 "," was dissected ill 197 1 to illvestigate the characteristics of a low coke rat;o bLast Ji/rnace. D escriptiolls oj th e dissectioll Ilrocedu re. general observatiolls all the internal stale oj these blast furnaces, characteristics oj each furnace. alld feiatiollshijlS betweell the illiemal state alld operalillg cOllditiolls are givell in this re/lort.

Laboratory study of phase transitions and mechanism of reduction of FeO from high Ti-bearing blast furnace primary slag by graphite

“…3,4 The determination of the properties of high Ti-bearing BF primary slag are essential for understanding this process; however, the mechanism of formation of primary slag is complex and it is very difficult to investigate directly in the blast furnace. Most previous studies were focused on melting-dropping tests [5][6][7][8][9][10][11][12] and blast furnace dissection, [13][14][15] and a few studies on reduction of FeO have been undertaken for Ti-free blast furnace primary slag. 16,17 Reducibility is crucial for blast furnace primary slag because it is associated closely with permeability, operation and productivity of the blast furnace, 16,17 especially for the high Ti-bearing blast furnace primary slag.…”

“…3,4 The determination of the properties of high Ti-bearing BF primary slag are essential for understanding this process; however, the mechanism of formation of primary slag is complex and it is very difficult to investigate directly in the blast furnace. Most previous studies were focused on melting–dropping tests 5–12 and blast furnace dissection, 13–15 and a few studies on reduction of FeO have been undertaken for Ti-free blast furnace primary slag. 16,17…”

Phase Composition and Formation Mechanism of Slag Crust in Blast Furnace

“…Due to the high temperature and high pressure inside the blast furnace, it is difficult to sample and analyze the slag crust during the normal production process of the blast furnace. Also, the previous dissection investigation of the blast furnace was mainly to study the internal state and the protective layer of the hearth, [13][14][15][16][17][18][19][20] but there are few reports on the slag crust of the blast furnace copper stave.…”

Effect of TiO2 and FeO on the Viscosity and Structure of Blast Furnace Primary Slags

“…The primary slag chemistry is not well defined. Compared to the BF final slag, the primary slag is considered to have higher basicity and contain a significant amount of FeO . The primary slag may also contain a few percent of TiO 2 from the addition of TiO 2 to the burden material for the purpose of forming a protective layer of titanium carbide and nitride on the hearth refractory to extend the furnace campaign life .…”