A method for combined injection desulfurization at the top and bottom of molten iron tank

Abstract

The invention belongs to the technical field of steel-making pre-desulfurization and discloses a molten iron tank top and bottom composite blowing desulfurization method. Adopted equipment comprises a top-blowing structure arranged in a molten iron tank and a bottom-blowing structure arranged at the bottom of the molten iron tank. The bottom-blowing structure comprises a first bottom-blowing ventilation element, a second bottom-blowing ventilation element, a third bottom-blowing ventilation element, a fourth bottom-blowing ventilation element and a blowing device connected with the four bottom-blowing ventilation elements. The first bottom-blowing ventilation element and the second bottom-blowing ventilation element are arranged in the portions, at a one-second distance from the circular center radius, of the bottom of the molten iron tank, and the circle center angles of the first bottom-blowing ventilation element and the second bottom-blowing ventilation element to the circle center are each 90 degrees. The third bottom-blowing ventilation element and the fourth bottom-blowing ventilation element are arranged in the portions, at a one-third distance from the circular center radius, of the bottom of the molten iron tank, and the circle center angles of the third bottom-blowing ventilation element and the fourth bottom-blowing ventilation element to the circle center are each 90 degrees. According to the molten iron tank top and bottom composite blowing desulfurization method, the flow field dynamics in the blowing process of the molten iron tank is optimized, and the thermodynamic and dynamic conditions required for deep desulfurization are met.

Description

technical field [0001] The invention relates to the technical field of steelmaking pre-desulfurization, in particular to a top-bottom composite injection desulfurization method of a molten iron tank. Background technique [0002] With the improvement of customers' requirements on the cleanliness of steel materials, the removal of harmful elements in steel has become the focus of metallurgists. Sulfur is one of the typical harmful elements, which can cause hot embrittlement and generate MnS in steel. , FeS and other inclusions affect the performance of steel, especially stamping, wear resistance and corrosion resistance. General steel requires sulfur content ≤ 0.015%, acid-resistant and high-grade pipeline steel requires sulfur content ≤ 0.002%, and hot metal pretreatment desulfurization as the most economical and effective desulfurization method is also more and more valued by metallurgists. [0003] At present, most steel mills at home and abroad adopt the top injection me...

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Problems solved by technology

[0004] The invention provides a top-bottom compound injection desulfurization method of a molten iron tank, which solves the technical problems of poor desulfurization injection operation power, unstable desulfurization quality, and low injection efficiency in the prior art

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