| To recover the iron in the dust which produced in steel-making process, the reduction experiment was performed by means of varing the most effecting factors on the recovery of iron such as the carbon ratio (actual carbon required for reduction of pellets/theoretical carbon required for reduction of pellets), the lime addition ratio and the reduction temperature in a given range. From this experiment, the following conclusions were summarized. 1) By the reduction with char-coal (carbon ratio: 1.5∼3.0, without addition of lime) the luppes were not produced at 1200℃ and 1300℃ but produced at 1400℃. And, at carbon ratio 2.0, the recovery of luppe produced at 1400℃ was optimum (74%). 2) By the addition of lime and the reduction with char-coal (carbon ratio: 2.0) the recovery of luppe was more than 60% at the reduction temperature 1200℃ and 1300℃, the lime addition ratio 30±5%. And in the case that the lime addition ratios were more or less than 30±5%, the luppes were not produced. 3) With the increase of the carbon ratio added with reducing reagent and the increase of the amount of addition of lime used by flux, the volatilization rates were increased and decreased, respectively. 4) In the case of addition of 30% lime the microstructure of graphite of luppes were coaser with increasing the carbon ratio at the reduction temperature 1200℃. At 1300℃ and the carbon ratio 1.5 and 2.0 the graphite was not seen. But at 1300℃ and the carbon ratio 2.5 and 3.0, the graphite was coarser than that at 1200℃ . |
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