SynopsisTo clarify the behavior of fuel sulphur in blast furnaces. fuel oils with different sulphur cOlltents and benzelle or benzyl mercaptan with radioisotope 35 5 were illjected into three blast furnaces with inner volumes of 1 249Ill", 1 407 m 3 , and 1409 m 3 • Samples for chemical analysis were taken jimn IJig iron, slag. dust, and gases during experimental operation. The radioactive sullJhur in the samples was precipitated as barium sulphate and the radioactivity was determined by a low background counter.Experimental results are as follows:(1) Specific radioactivity of IJig iron and slag became constant in lIine to tell hours after the start qf filel oil iluection with the radioactive sullJlwr.(2) Th e behavior of jile! oil sullJllllr in thefumaces war lillie affected by the sulphur cOlltellt in theIllel oils, the quantity oI Iuel oil hUectioll. alld other olJeratillg conditinns.(3) The desullJllllrization rale offilel oil is slight(y bigger lhall the mean desullJlllIrizatioll rate q( all other blast furnace burdfll. The ralio of Ihe distribution ratio (5)/[5] Ior filel oil to that for other blast furnace burden was a/J/Jroxilllately 1.2.(4) If the ratio oI/lwl oil sul/Jh ur to the tolal .fIlllJh ur in the burdell increased, Ihe qualltily of sullJlm r ill /Jig iroll originated in the file! oil /Jroportionally increased.Thus, in ordn to keelJ the SIlI/Jllllr cOlllent of IJig iroll wilhin a certain vallie, it is necessary to use filel oil oI lower sulphur colltellt or tq rP"'ricl Ihe quantity of filel oil ilUected.
Synopsis: customarily the phenomenon of iron escaping is explained as the result of build-up of viscous slag bearing reduced titanium compound and Salamander in the hearth. However,it seems that the quantity of iron escaping from cinder notch in case of a certain blast furnace is rather related to the low permeability of furnace column rather than to titanium content in burden.Thereupon,we examined the cause of the phenomenon by measuring slag viscosity and analyzing permeability of column. As the result,the phenomenon is found to result not from the elevation of slag viscosity by titanium compound, but from the reduction of raceway by low permeability of column. This is thought due to the irregularity of slag temperature around the core and a narrowing of space between the inner wall and the core by reduction of raceway.
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