A method for improving sinter yield in converter smelting

Abstract

The invention relates to a method for increasing the sintered ore yield in converter smelting. The method comprises the steps of (1) raw material operation, specifically, the molten iron mixing amountand the molten iron condition are controlled; and (2) converter operation, specifically, the adding amount of sintered ore is controlled, bottom blowing nitrogen stirring is conducted when a bottom blowing converter is adopted, gun lowering nitrogen blowing is conducted when a bottomless blowing converter is adopted, temperature drop of the sintered ore is controlled, slag overflow is prevented,the gun position is lifted in the medium term of blowing smelting in order to avoid the condition that a slag drying returning phenomenon occurs in the carbon-oxygen sharp reaction period, and a slagretaining mark is added in advance when steel tapping is conducted to avoid later-period slag discharging. According to the method, the sintered ore is added through a converter high-position materialbin after molten iron mixing, a self-reducing reaction is made to be generated firstly through a nitrogen stirring technology, then oxygen is normally supplied for blowing smelting, and the sinteredore yield is increased. The method is simple, practical and convenient to operate, the steel consumption index is decreased very obviously, and therefore the steelmaking cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for increasing the yield of sintered ore in converter smelting. Background technique [0002] At present, scrap steel resources used in steelmaking in the metallurgical industry are quite tight, and there is often a shortage of supply. In addition, whenever the crane is overhauled, the converter cannot add steel scrap normally, so the high-level silo of the converter must be equipped with cooling scrap for normal smelting of the converter. For high-level cooling scrap steel, the scrap steel must be processed into the required particle size in order to facilitate storage and vibration in the silo, and long-term use is likely to cause damage to the silo; at the same time, high-level cooling scrap steel is more expensive than normal scrap steel processing. In the severe situation of the current steel market, the cost needs to be minimized, and the additio...

AI Technical Summary

Problems solved by technology

For high-level cooling scrap steel, the scrap steel must be processed into the required particle size in order to facilitate storage and vibration in the silo, and long-term use is likely to cause damage to the silo; at the same time, high-level cooling scrap steel is more expensive than normal scrap steel processing. In the severe situation of the current steel market, the cost needs to be minimized, and the addition of high-level scrap steel to the converter will directly cause the cost to rise