Melting method of converter, and facility for implementing the method

Abstract

This invention relates to method and apparatus for smelting ferrous metals, nonferrous metals and iron alloys in converter. The method provides DC to the converter to construct spacial magnetic field in the converter. The DC is pre-adjusted before applied to the converter so that the melt in the converter moves from the edge to the center of the converter. During converter smelting process, iron-containing raw material 1-40 kg/ton steel is added into the converter. The iron-containing raw material is selected from iron ore, oxide scale, pellet or other iron-containing raw materials. A supplementary magnetic field contrary to the direction of the ascending gas flow in the converter is formed by the contact electrode at the top of the converter. The apparatus comprises: a converter with refractory lining, an injection oxygen lance in the converter, a solenoidal coil in the lining, a DC generator, and a modulation signal generator.

Description

technical field [0001] The invention belongs to the fields of smelting of ferrous metals and nonferrous metals and ferroalloy production, and in particular relates to a converter smelting method and equipment for implementing the method. Background technique [0002] Ogurtsov A.N., Gles A.B. Continuous Casting of Steel - Dnepropetrovsk: Systematic Technology, 2002. - Page 675 - [Document 1] discloses the use of electromagnetic fields in continuous casting for crystallization tanks A method of axially stirring the inner metal, the purpose of which is to contain the rapid downward flow introduced by the middle ladle jet. For the subject that needs to strengthen the melt movement in the converter, the disadvantage of this method is that the melt movement caused by this method is opposite to the melt movement caused by the blowing air flow. The movement caused by the blowing air flow, according to Yawoyski B.N. The theory of steel production process—M.: Metallurgy, 1967—792 pag...

AI Technical Summary

Problems solved by technology

For subjects that require enhanced melt movement in the converter, the disadvantage of this method is that the melt movement caused by this method is in the opposite direction to the melt movement caused by the blown airflow

However, for solving other unresolved problems in converter production (increasing the output rate of molten steel, increasing the temperature of the melt and reducing the amount of dust), the disadvantage of this method is that it does not affect the vertical melt movement, Including the vertical melt motion in the peripheral space of the converter bath, which is extremely important, because the speed of the natural convective motion caused by the injection air flow near the furnace wall is greatly weakened, making the stirring effect in these parts negligible , which adversely affects various physical-chemical processes

[0004] The second disadvantage of the above method (and also the method of document [1]) is that the AC current generated by the power supply equipment used to cause the external magnetic field is either an industrial frequency current or a low frequency current, but they are all frequency constant current

However, for the problems raised by converter production, the effect of using alternating current with stable specifications, especially stable frequency, will not be very good

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