JPS55122833A - Sintering machine operating method - Google Patents

Abstract

PURPOSE: To increase the strength of an upper portion of sintered ore and enhance the yield by changing downward suction draft with blast boxes to upward draft when sintering of the lowermost layer of starting materials on a pallet is finished in manufacture of sintered ore of iron ore with a Dwight-Lloyd type sintering machine.

CONSTITUTION: Mixed starting materials for sintered ore are dropped onto the pallet of sintering machine 5 from ore feed hopper 3, and coke in the materials is fired with firing furnace 6. Air is suction-fed downward with blast boxes 7 to sinter a starting material layer from the top to the bottom. An upper layer portion is not sintered well owing to its low temp., so it has insufficient strength and tends to crush, resulting in a lowered yield, and it exhibits inferior reduction disintegrative properties in a blast furnace. Therefore, by measurement with a thermometer or an analyzer for exhaust gas components such as CO and CO₂, it is detected that sintering of the undermost portion of the sintering material layer is finished. At that time the blast is changed from the downward draft to upward draft to reheat the upper portion layer of low sintering strength with hot exhaust gas from the lower portion layer, resulting in a higher sintering degree. Thus, the strength of all of the sintered ore is increased, and the amt. of returned ore is reduced to enhance the yield.

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