Converter steelmaking method and converter steelmaking device

Abstract

The invention discloses a converter steelmaking method and a converter steelmaking device, belonging to the technical field of converter steelmaking. The converter steelmaking method comprises the steps of: feeding dry high-grade ore concentrate powder containing less than 1% of water and 65% of iron into a jetting pot; introducing two air sources in the jetting pot, wherein the air sources are nitrogen or compressed air and the pressure of each air source is equivalent to that of oxygen for convertering; envenly mixing the ore concentrate powder with the air sources in a mixer to obtain a mixture, enabling the mixture to enter a spray gun through a pipeline; during heat emission of molten steel in intermediate smelting of steelmaking, jetting the concentrated phase of the ore concentrate powder into a converter; and controlling the temperature within a range of 1500-1600 DEG C and reacting for steelmaking. Slag overflowing and molten steel spattering are avoided; the consumption of coal and coke, the consumption amount of oxygen, and the additive amount of steel or pig iron ore are lowered; continuous and even power jetting is achieved.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and relates to a converter steelmaking method and device. Background technique [0002] The existing converter steelmaking method has the following defects: 1. During the oxygen blowing process, a large amount of heat released by silicon, phosphorus, and carbon during the blowing period leads to an excessively high temperature of the molten steel, and it is necessary to add cold material to adjust the temperature during the steelmaking process. The tapping temperature of molten steel, and the oxidation process of carbon and silicon will consume a large amount of oxygen, and the use of cold material will increase the production cost; 2. The carbon content of molten iron used in steelmaking is between 4-6%, and a small amount is added during production Due to the small surface area of ​​the pellet or lump ore, it cannot react quickly with the carbon in the molten iron in time, while t...

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Problems solved by technology

[0002] The existing converter steelmaking method has the following defects: 1. During the oxygen blowing process, a large amount of heat released by silicon, phosphorus, and carbon during the blowing period leads to an excessively high temperature of the molten steel, and it is necessary to add cold material to adjust the temperature during the steelmaking process. The tapping temperature of molten steel, and the oxidation process of carbon and silicon will consume a large amount of oxygen, and the use of cold material will increase the production cost; 2. The carbon content of molten iron used in steelmaking is between 4-6%, and a small amount is added during production Due to the small surface area of ​​the pellet or lump ore, it cannot react quickly with the carbon in the molten iron in time, while the iron ore has a high oxygen content, and the carbon-oxygen reaction in the molten steel is relatively active, which will cause overflow in the early stage of smelting. Much slag and molten steel splash

[0003] In summary, the existing converter steelmaking method has high production costs, high consumption of oxygen, coal, and coke, unsuitable control of steelmaking temperature, and potential safety hazards in the production process.

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