Dephosphorization method for oxygen top-blown converter slag remainder

Abstract

The invention discloses a dephosphorization method for oxygen top-blown converter slag remainder. The dephosphorization method includes the steps that before slag-splashing for protection of a converter, a dephosphorization agent is added to the slag remainder in the converter after tapping, then inert gases are top-blown by an oxygen gun for the operation of slag-splashing for protection of the converter, and dephoshprized slag remainder serve as initial slag of the next melt of smelting. According to the method, the oxygen top-blown converter slag remainder operation is combined with the slag remainder dephosphorization process, the phosphorus content in the slag remainder can be lowered effectively, and the drag-in amount of phosphorus in the next melt of converter smelting process is lowered, so that the lime addition amount in the next melt of converter smelting process can be reduced, and the converter smelting cost is lowered. By the adoption of the dephosphorization method, part of the phosphorus element in the slag remainder in the converter can be removed, the slag amount is small in the smelting process, the heat loss is low, the iron loss is small, the converter slag dephosphorization effect is good, and the smelting cost is lowered remarkably.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, in particular to a dephosphorization method for slag retention in an oxygen top-blown converter. Background technique [0002] Oxygen top-blowing converter slag retention operation was proposed in the early 1980s. Due to the lack of mastery of the operation safety rules after slag retention, large sprays often occur when mixing molten iron, so the promotion and application of slag retention operation is limited. Oxygen top-blowing converter slag retention operation can greatly reduce the consumption of iron and steel materials, save lime, and can quickly create high-basicity oxide slag in the early stage of converter blowing, which is conducive to improving production efficiency and has significant economic benefits; currently, due to production costs Under the pressure, many enterprises take effective preventive measures to implement slag retention operations. Converter slag mainly contains...

AI Technical Summary

Problems solved by technology

[0002] The operation of leaving slag in the oxygen top-blown converter was put forward in the early 1980s. Due to the failure to grasp the safety rules of the operation after leaving the slag, large sprays often occur when mixing molten iron, so the popularization and application of the operation of leaving the slag has been limited.

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