Synopsis:The effects of injection of lime-oil slurry through the tuyeres were studied with the use of modelling instruments, and full scale tests of injection into blast furnace were carried out at Muroran Works, Nippon Steel Corp., Japan.Following results were obtained.(1) Degree of sulphur distribution coefficient between pig iron and slag under the condition of an operating blast furnace was only 20-40% compared with the equilibrium to be obtained.(2) Sulphur content of pig iron drops was reduced rapidly in fluidized lime fines. Lime fines reacted mostly in melted zone of materials so that those slag basicity was increased. The dropping temperature of melted materials, however, did not rise in proportion to injection rate of lime, when the parts of the amount of lime in the burden materials charged into the furnace top were replaced beforehand by the equivalent amount of injected lime fines.(3) Lime-oil slurry injection tests through all the tuyeres of Muroran No. 1 blast furnace showed that 25% of sulphur content of pig iron was reduced at the lime injection rate of 20 kg/t-p, and permeability of the melting zone was improved without producing the viscous slag. (Received July 8, 1974) (Muroran Works, Nippon Steel Corp.) (Muroran Works, Nippon Steel Corp.) (Muroran Works, Nippon Steel Corp., 12 Nakamachi Muroran 050)
Sintering tests were performed on 63 varieties of iroll ores. T hree major sintering properties were then chosen .from the lest results, namely shaller strength, productivity and coke consumption. A methodfor expressing them objectively was worked out in order to evaluate the sinter malerials in general, utilizing the test results. The ores were then classified according to the .fourfaclors q{ p article size, FcO percenlages, S iO z percentages alld gangue minerals, since sintering /I1"operties are definitely related to such pro/)erties of ore<. A s a result, it has been learned that, except processed ores, natural ores belonging to a certain groul) have showed neari.J1 identical sintering properties. COllseqllenti.J ' , if the /)artide size and chemical composition of an are are known, its sinlering characteristics will be inJerred from this evaluatioll method. M oreover, these data con be also a/)I)lied 10 mutatis mutandis for silltering mixed ores colltaillillg lime. * This a rti cle is in re re re nce to the lect ure d eli ve red bero re the 70 th I.S.I.]. M eetin g held in O ctobe r in K yushu. J a p a n ese text was received on M ay 17, 1965 a nd prin ted in
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