Production of Self-fluxing Pellets at Hirohata Works of Nippon Steel Corporation

Abstract

Ni/JPolI Steel Corporatioll set up a pellet /llallt havillg the capacity oj 2.5 millioll t!year at H irohala Works (H irohata Pellet Plallt) and il/ February J 9 73 slarted the Ilroductiol/ oj self-fluxillg pellets having a basicity oj 1.2. T he cOllstructioll and o/leratioll oj this pellet plal/t, the characteristics q(self~flllxil/g Ilellets prodllced, al/d operatiol/al data oj pellets as used ill blast Jurnaces are reported ;11 this /la/ler. T he H irohata P ellet Plant, cOllstructed Jor Ihe p roductioll oj self-fluxing jlellets Jrom slurry oj iron ores, is equill/led wilh a slurry p ipelil/e, a storage /Jond, etc., specially designed Jor Ihe purpose. T he firi llg Jurnace qf grate kiln (ype was adopted to produce uniformly baked homogeneous peLLets. The produci peLLets are sllperior to acid pellets ill the Ilroperties sllch as the redllcibility. swellillg during reductioll, and high-temperatllre characteristics ul/der load. alld behave excellelllLy ill Ihe blastJumace.

A review of high-temperature experimental techniques used to investigate the cohesive zone of the ironmaking blast furnace

“…Nominally, the crucible inner diameters are in the range from 18 to 120 mm and the ferrous layer heights are less than 150 mm. Ferrous burden materials are usually less than 20 mm in diameter and the quantity varies from a single particle to around 900 g. Only a few S&M tests are carried out with the recommended ratio of crucible diameter to a particle diameter of 7 [90]. The validity of pressure drop measurement for tests performed using small diameter crucibles and relatively large samples may be affected by wall effects, e.g.…”