Converter lance-lifting non-toppling direct tapping method

Abstract

The invention discloses a converter lance-lifting non-toppling direct tapping method, and belongs to the technical field of metallurgy. According to the method, after an oxygen lance is lifted at theend of converter blowing, the oxygen lance is automatically lifted to a waiting position, the control mode of the oxygen lance is switched, the lance position is manually controlled, an oxygen lance head is inserted into a furnace mouth by 1.0-1.5m through manual control, the depth of the oxygen lance head in the furnace mouth is judged according to a difference value between the absolute height of the oxygen lance and the absolute height of the furnace mouth, a nitrogen stop valve is opened, a flow regulating valve is opened to 100%, and nitrogen is continuously blown for 10-30 seconds. According to the method, damage caused by slag overflowing from a tapping hole to steel-making equipment is avoided, and the quality accident that the quality of molten steel is influenced by rephosphorization as a result of splashing of the steel slag into a steel ladle is also reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for directly tapping a converter without turning it down. Background technique [0002] The converter steelmaking of my country's iron and steel enterprises mainly adopts the "constant pressure variable lance" operation mode, that is, through the control of the oxygen supply lance position, the slag removal in the early stage, the decarburization and temperature rise in the middle stage, and the intensified stirring in the later stage are realized. [0003] As the current steel market situation continues to be bad, major steel mills are trying their best to reduce costs. In order to reduce the cost of converter steelmaking, some steel mills have adopted the method of eating more low-priced iron-containing cold materials. It has brought difficulties. A large amount of iron-containing cold material is added, which increases the amount of slag in the converte...

AI Technical Summary

Problems solved by technology

[0003] As the current steel market situation continues to be bad, major steel mills are trying their best to reduce costs. In order to reduce the cost of converter steelmaking, some steel mills have adopted the method of eating more low-priced iron-containing cold materials, which has caused a lot of problems for converter operations. It has brought difficulties. A large amount of iron-containing cold material is added, which increases the amount of slag in the converter, which brings difficulties to the tapping of the converter equipped with sub-lances. The huge amount of slag in the furnace is directly tapped from the gun, often A large amount of slag overflows from the furnace mouth, which damages the steelmaking equipment. The steel slag splashes into the ladle and causes phosphorus reversion, which affects the quality of molten steel. , which greatly increases the labor intensity of workers

In order to avoid the occurrence of the above situation, the operator often adopts the operation of pouring the furnace and slag before tapping. Although this can prevent a large amount of slag from overflowing from the furnace mouth during the tapping process, the temperature loss in the furnace is caused by the process of pouring and slag, which increases the LF. Furnace power consumption affects the production rhythm

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