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)
The research was started with the selection of coal, preparation of slurry and the fundamental pipeline flow tests. According to the results thereof, a slurry injection system having a capacity of 85 tons per day was erected. Slurry began to be injected through the ten tuyeres of Muroran No. 1 blast furnace from February 1963. Since then, the slurry density has been increased to 50 wt% coal fines and a considerable coke saving was made. Comparative tests, carried out between fuel oil and slurry, showed that there were no noticeable differences between them with respect to the output and the coke rate.
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