Method for Controlling Phosphorus Content in Steelmaking Converter Tapping in Vanadium-Containing Hot Metal Smelting

Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a method for controlling the phosphorus content of tapping of a steel converter during smelting of vanadium-containing molten iron. The method for controlling the phosphorus content of tapping of the steel converter during smelting of the vanadium-containing molten iron is provided and performs deep vanadium extraction by optimizing vanadium extraction smelting process parameters, the semisteel carbon content is reduced after tapping of a vanadium extraction converter, the semisteel temperature is raised, and conditions are created for fast decarbonization and phosphorus protecting of the steel converter. Meanwhile, semisteel subjected to vanadium extraction is mixed into the steel converter, and by means of control cover a lance position of a converter oxygen lance and the slag making system, finally, the purposes of fast decarbonization and phosphorus protecting are achieved. By means of the method, the dephosphorization rate of the converter can be controlled within 30%, and the phosphorus content of end point molten steel of the steel converter can be remarkably improved. The method can increase the vanadium slag content during vanadium extraction, it can also be guaranteed that the steel converter has high phosphorus content at the end point, operation is easy, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling the phosphorus content in tapping of a steelmaking converter by smelting vanadium-containing molten iron. Background technique [0002] For general steel types, phosphorus is a harmful element. It can reduce the impact toughness of steel, increase the embrittlement temperature of steel, deteriorate the welding performance of steel, and cause embrittlement and cracking of steel. It is generally required when smelting this type of steel The lower the phosphorus in molten steel, the better. However, for some special-purpose steel grades, it is usually required that the phosphorus content of the finished molten steel be above 0.06%. Because phosphorus can increase the corrosion resistance of steel, and phosphorus, as the forming element with the largest solid solution strengthening ability, is of great significance for increasing the strength ...

AI Technical Summary

Problems solved by technology

However, the main problems of this process are: due to the addition of ferrophosphorus for alloying during tapping, the recovery rate of phosphorus is low, which increases the consumption of ferrophosphorus. Steel consumption, and increase the amount of iron loss in the slag, and the addition of scrap steel is limited, which greatly increases the smelting cost and prolongs the smelting time

However, the measures to suppress the dephosphorization reaction of the converter have certain fluctuations due to the influence of the operating process, and different manufacturers have different tooling and equipment, and the effect is also different.

[0004] Another example is that the application number is "200410047045.0", and the title of the invention is "a method for smelting phosphorus-containing steel", which discloses a method of rapidly increasing the temperature in the early stage and adding a large amount of phosphorus iron ore or phosphorus ore to the furnace to increase phosphorus in molten steel. The purpose of this method is to increase the phosphorus content of molten steel at the end point. This method will cause a large temperature drop after adding a large amount of phosphate ore. At the same time, using a low gun position in the smelting process will easily cause smelting process splashing and affect the normal production of the converter.

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