Control device and control method for refining ladle slag emulsification

Abstract

The invention discloses a control device for refining ladle slag emulsification. The control device comprises a furnace body; a wall surface of the furnace body comprises a fire-resistant layer, a furnace body permanent layer and a thermal insulation layer that are arranged from the inside to the outside sequentially; a brick cup layer is arranged at the bottom of the furnace body; the thermal insulation layer and the brick cup layer are externally provided with wrapping steel wrapping the whole furnace body; the fire-resistant layer comprises a molten steel fire-resistant layer part located at the lower part of the furnace body and a slag line fire-resistant layer part located at the upper part of the furnace body; a coil is arranged the corresponding upper parts of the thermal insulation layer and the slag line fire-resistant layer; and the two ends of the coil are connected with an anode and a cathode of a direct current power supply. The invention further discloses a control method for the refining ladle slag emulsification. The control method is characterized in that molten steel and slag are poured into furnace body, argon gas is blown in from the bottom of the furnace body for 1-3mins, then the direct current power supply is turned on, the coil is electrified, and an electromagnetic field is formed. An emulsification motion state of the slag is controlled in real time under a dynamic condition, so that the life of a liner material is prolonged effectively, the steel cleanness is improved, and a guarantee is provided for safe and efficient production of high quality steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a control device and method for emulsifying molten slag in a refining ladle. Background technique [0002] In recent years, with the progress of society and the development of science and technology, modern defense, transportation, energy and other industries have higher and higher requirements for steel performance. In order to meet this requirement, the research on clean steel technology has become an important research in the field of iron and steel metallurgy technology. topic. Improving the cleanliness of molten steel is the basis for improving steel quality. The removal of impurities such as [O], [H], [N] and non-metallic inclusions in steel that have a greater negative impact on steel performance has become a steelmaking process. An important link in the production of high-quality steel grades. Therefore, it is of great practical significanc...

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Problems solved by technology

Relevant studies have shown that the kinematic viscosity of the light emulsified phase has an important influence on its emulsification critical velocity. After the slag droplets emulsify into the molten steel, they will not only be involved to form inclusions, but also contact the lining refractories below the slag line and cause serious corrosion. damage

Excessive content of non-metallic inclusions in steel not only affects the surface quality of the steel, reduces the mechanical properties of the steel, especially reduces the plasticity, toughness and fatigue limit, but also causes the steel to be prone to brittle fracture. It has very strict requirements, such as low-carbon aluminum-killed steel for DI tanks with a thickness of 0.2-0.3 mm. In order to prevent cracks during flushing, the particle size of inclusions in the steel is required to be less than 40 μm; the size of inclusions is required for engine valve spring steel. Less than 15 μm, but it has not been able to achieve the above goals efficiently and stably

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