| 摘要 |
PROBLEM TO BE SOLVED: To secure the strength and the yield of sintered ore by receiving lime stone of the grain size distribution as by the ordinary way from a mine, utilizing fine grains without exhausting them out of the system and using a large amount of highly crystallized water-containing ore. SOLUTION: The lime stone 2 is screened and the minus-mesh fine grain lime stones 17 are granulated into pseudo-grains 19 and blended with powdery iron ore 1, or the like, and plus-mesh lime stone 20 to prepare pseudo-grains for sintering, and the sintered ore is produced. The above sintered ore producing process and a sintered ore producing process using the pseudo-grains for sintering by using the lime stone 2 without screening are operated by changing over at any time. The separation point of the screening is made to 1, 0.5 or 0.25 mm. The pseudo-grains for sintering are charged into a pallet in a sintering machine with a charging device having a grain size segregation forming function in the thickness direction of raw material layer. The distribution of the CaO concentration in the raw material charged into the pallet in the raw material thickness direction is formed so as to be higher from the upper layer part toward the lower layer part. Further, the operation after blending a large amount of the high crystallized water-containing ore is execute.
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