Slagging method of sintering return mines of continuous steelmaking electric furnace

Abstract

The invention relates to a slagging method of sintering return mines of a continuous steelmaking electric furnace. The slagging method comprises the following steps: firstly recovering small-particle sintering return mines used by a blast furnace in an enterprise as a raw material, wherein the sifted particle size of small-particle sintering return mines is 2-5mm; then charging the sintering return mines into a bulk material elevated cabin; conveying the sintering return mines by virtue of a belt again, and adding the sintering return mines in the furnace in batch in the smelting process; carrying out various chemical reactions on the sintering return mines under the high temperature action of a melting pool so as to generate bubbles and form foam slag; adding the sintering return mines in batch in the steel smelting period in each furnace; before reaction of the front batch is basically finished, adding the next batch after poor foaming of the furnace slag appears, wherein excessive addition can cause strong reaction in the welting pool; and finally, in the smelting process, along with strong carbon oxygen reaction in the melting pool and reduction of FeO in the furnace slag, timely supplementing the sintering return mines. According to the slagging method disclosed by the invention, in the smelting process, the sintering return mines are added into the furnace, the melting point of the furnace slag is lowered, formation of the foaming slag is promoted, the steelmaking process is realized, and the purposes of comprehensively utilizing the mines and lowering the cost are achieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and relates to a method for sintering and returning ore and slagging in a continuous steelmaking electric furnace of raw materials used for slagging in steelmaking. Background technique [0002] The requirement of low cost has made the Consteel electric furnace gradually move towards the converter steelmaking process, and the amount of molten iron added has become higher and higher, and the amount of molten iron fed into the furnace can reach 960-1000kg / t. Relying on the physical heat and chemical heat of molten iron as the main heat source for steelmaking, the heat balance in the smelting process is adjusted by adding appropriate amount of scrap steel, pig iron and other raw materials, realizing continuous addition of slagging material, continuous scrap steel preheating, continuous addition of molten iron, High-efficiency fast-paced steelmaking with continuous oxygen supply smelting. In the...

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Problems solved by technology

However, if the amount of fluorite is too much, it will cause different degrees of erosion on the furnace lining refractory materials and smoke hood. More importantly, as resources become more and more scarce, the price of fluorite will run at a high level, resulting in higher costs for slagging materials. affect production costs

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