Efficient full-iron steelmaking method allowing molten iron to be added into pig iron in electric-arc furnace

Abstract

The invention discloses an efficient full-iron steelmaking method allowing molten iron to be added into pig iron in an electric-arc furnace. The efficient full-iron steelmaking method is characterized by comprising the following steps: (1) leaving 7.5-8.5 parts of slag materials in the furnace; (2) adding the 61-69 parts of blast-furnace molten iron and 0.5 part of lime into the furnace; (3) adding 8-10 parts of pig iron blocks through a feed channel, cooling, replenishing 1.5 parts of the slag materials, cooling, and adjusting slag; (4) adding the slag materials in batches until the mass concentration of carbon is smaller than 0.20%; (5) adjusting temperature and the content of carbon and the content of phosphorus in steel; (6) tapping. The slag materials include the lime, dolomite and sintering return mine, and the mass ratio of the lime, the dolomite and the sintering return mine is 6:2:1. The efficient full-iron steelmaking method has the advantages that because the new method that the molten iron is added through a furnace door of the electric-arc furnace, and the pig iron is fed through the feed channel is adopted, feeding can be carried out without opening a furnace cover, and continuous smelting is achieved; the total smelting cycle of the method is 52 minutes and is reduced to 80% of an original smelting cycle, so that the objective of efficient steelmaking is achieved; production cost is effectively reduced, for making each ton of steel, the consumption of the iron materials is reduced to 1090 kilograms, the costs of the slag materials are reduced to 59 yuan, and electricity consumption is reduced to 56kwh; the content of the five harmful residual elements in the steel is greatly reduced, and therefore the performance of the steel is more stabilized.

Description

technical field [0001] The invention relates to a steelmaking method, in particular to an all-iron high-efficiency steelmaking method of adding pig iron to molten iron in an electric arc furnace, and belongs to the field of steelmaking. Background technique [0002] At present, the existing steelmaking methods mainly use scrap steel for refining, but scrap steel resources are relatively scarce, and the price of scrap steel is much higher than that of molten iron or pig iron, which increases the production cost of steelmaking. In addition, the use of scrap steel for refining still has the following problems: [0003] 1. The purity of smelting steel is not high enough; [0004] 2. The performance of steel is not stable enough; [0005] 3. During the smelting process, it is necessary to open the furnace cover to charge. Contents of the invention [0006] In order to solve the deficiencies of the prior art, the object of the present invention is to provide an all-iron high-...

AI Technical Summary

Problems solved by technology

[0003] 1. The purity of smelting steel is not high enough;

[0004] 2. The performance of steel is not stable enough;

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