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Hot metal pre-dephosphorization method

A technology of molten iron and pre-dephosphorization, which is applied in the field of pre-dephosphorization of molten iron, can solve the problems of high heat and low dephosphorization efficiency in the pre-dephosphorization process, and achieve the goal of reducing the production cost of the converter, increasing the metal yield, and increasing the carbon content at the end point Effect

Active Publication Date: 2017-01-04
北京北科中钢工程技术有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for pre-dephosphorization of molten iron, which solves the technical problems of low dephosphorization efficiency or excessive heat in the process of low-cost smelting and low-phosphorus steel development.

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Embodiment Construction

[0025] Starting from the thermodynamic conditions of dephosphorization, the main points of dephosphorization control are determined as follows:

[0026] 1. Slag control

[0027] by attaching figure 2 CaO-2CaO·SiO 2 -CaF 2 The study of the ternary phase diagram established a reasonable dephosphorization slag system, and the composition of CaO was controlled at 30-60wt%, SiO 2 The composition is 10~40wt%, CaF 2 The composition is 5-30wt%.

[0028] 2. Temperature control

[0029] According to the thermal balance conditions of the dephosphorization process, the amount of slagging materials (lime, limestone, dolomite, fluorite, etc.) and coolant (ore, sinter, pellets, etc.) Large temperature fluctuations will cause splashing. It is recommended that the coolant feeding be controlled by PLC to ensure that the coolant feeding speed is balanced.

[0030] 3. Phosphorus and carbon content of semi-steel

[0031] The carbon content of the semi-steel is ≥3.4wt%, and the phosphorus ...

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Abstract

The invention provides a hot metal pre-dephosphorization method and belongs to the technical field of hot metal treatment in steelmaking. During loading of hot metal, the proportion of the hot metal is 92-100% and the proportion of scrap steel is within 8%; during slag formation, the slag basicity R is 1.6-2.6, feeding of lime and dolomite for slag formation is started within 40 seconds after blowing; when 7 minutes before oxygen supply, the oxygen supply flow Q is 1 / 4 to 1 / 2 of the oxygen flow of a decarburization furnace, and the later-period oxygen supply flow is 0.85-1.0 time of the early-stage oxygen supply flow Q; the maximal bottom-blowing air supply intensity is not less than 0.020Nm<3> / min.t; the final temperature of a dephosphorization furnace is not higher than 1380 DEG C, and the dephosphorization rate is higher than 80%. The method provided by the invention has the advantages that the dephosphorization efficiency of hot iron pre-dephosphorization based on an existing converter is not less than 85%; heating materials are not needed to be added for a following decarburization furnace, so that the converter production cost is greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of molten iron treatment in steelmaking, and in particular relates to a method for pre-dephosphorizing molten iron. It is a high-efficiency hot metal pre-dephosphorization production process, and it is the most effective way for converters to realize low-cost smelting and low-phosphorus and ultra-low-phosphorus steel production. Background technique [0002] At present, the domestic Jingtang Steel Plant is the only iron and steel enterprise that adopts the dual-process dephosphorization arrangement. Others, such as Qinggang and Jinan Iron and Steel 210 converter areas, all adopt the method of platform opening to realize the rapid transfer of dephosphorized molten iron to realize the dephosphorization of molten iron. pre-dephosphorylated. At present, the dephosphorization efficiency of the pre-dephosphorization of the existing converter molten iron can only reach about 65-70%, and the dephosphorization effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCC21C7/064
Inventor 张红文刘国仇龙
Owner 北京北科中钢工程技术有限公司
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