Method for smelting rail steel with vanadium-bearing hot metal as raw materials

Abstract

The invention discloses a method for smelting rail steel with vanadium-bearing hot metal as raw materials. The method comprises the steps that firstly, deep desulphurization is carried out on the vanadium-bearing hot metal through a combined injection method, and thus low-sulfur vanadium-bearing hot metal with the sulphur content smaller than 0.008% is obtained; then, the low-sulfur vanadium-bearing hot metal is put in a converter, a dephosphorization agent is added, blowing vanadium and carbon holding pre-dephosphorization is carried out, and thus vanadium-bearing semisteel with the P content smaller than or equal to 0.040% is obtained; a part of the vanadium-bearing semisteel is tapped in a steel ladle, smelting deep dephosphorization continues to be carried out on the rest part of the vanadium-bearing semisteel through converter slag formation, and thus end point molten steel with the P content smaller than or equal to 0.008% is obtained; and finally, tapped steel of the end point molten steel and the vanadium-bearing semisteel are mixed, a proper amount of deoxidization alloy and high-alkalinity refining slag is added, bottom argon blowing mixing is carried out on the steel ladle, and qualified molten rail steel is obtained. According to the method disclosed by the invention, the operation method is simple, and the production cost is low; the effective utilization and extraction of vanadium resources are guaranteed, and dephosphorization and little slag smelting can be effectively achieved in the converter steelmaking process; meanwhile, the energy is saved, the amount of adopted ferrovanadium alloy and carburant is greatly lowered, and the smelting cost is lowered.

Description

technical field [0001] Embodiments of the present invention relate to the field of metallurgy, and more specifically, embodiments of the present invention relate to a method for smelting rail steel using molten iron containing vanadium as a raw material. Background technique [0002] With the speed-up and heavy-duty development of railway transportation, higher performance and quality requirements are put forward for rail steel. In the cold winter of iron and steel enterprises, under the premise of ensuring quality, more and more attention has been paid to how to achieve high-efficiency and low-cost production ideas. [0003] In my country, some steel plants use vanadium-titanium ore for smelting, and the molten iron obtained after smelting contains P content of 0.050%-0.080%, S content of 0.055%-0.100%, Si content of 0.10%-0.30%, and V content of 0.25%-0.35%. ; In order to ensure the effective extraction and utilization of vanadium resources, vanadium extraction and desulfur...

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Problems solved by technology

[0006] (3) It is necessary to add a large amount of recarburizer to meet the composition requirements of the rail steel, which not only increases the cost, but also wastes the heat source;

[0008] In the existing technology, there are certain documents and patent reports on the process and method of producing vanadium-containing rail steel, but it involves a method of using vanadium-containing molten iron as raw material and adopting converter pre-dephosphorization and less slag smelting, vanadium-containing semi-steel and converter end point The control method for the homogeneous production of vanadium-containing rail steel by mixing molten steel has not been found in the industrial production of converter steelmaking.

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