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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.

were quenched while in a normal operatillg conditioll, and were dissected with utmost care. The conditiolls oJ the reducillg zone in the Jurnace shaft are described in this report. From the dissection qf Ihe blast Jurnaces it has beell clarified the burden distribulion, gas flow ill the shaft derivable Jrom the burdell distribution , challges in the properties oJ burden with the progress oJ reduction, and behavior oJ zinc, sulfur Gnd alkali in the shaJt. Unambiguous accoullts were also given to the relationships between the o/Jeratillg conditions alld challges in the properties oJ burden in the shaft. III. this re/Jort, discussions are Jocused 011 the methods oJ testillg burdells alld the properties oJ burden which have been ascertained as the necessary ones Jor rlfective blastJurnace o/Jeraliolls.