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A long-life synchronous multiple blowing dephosphorization smelting method for high-phosphorus molten iron

A smelting method and a long-life technology, applied in the field of iron and steel metallurgy manufacturing, can solve the problems of low life of the bottom blowing system, inability to realize synchronization of the re-blowing system, high phosphorus content, etc.

Active Publication Date: 2021-09-10
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at abundant reserves of high-phosphorus ore in Yunnan Province, high phosphorus content in molten iron (Mn≤0.50wt%, Si 0.15-0.55wt%, P0.350-0.550wt%) for steelmaking converters, and heavy dephosphorization burden in the smelting process. It is necessary to design and improve the top-bottom combined blowing smelting process to solve the problems of high phosphorus [P] in the first downturn, low life of the bottom blowing system, difficulty in fully exerting the bottom blowing effect, and the inability to synchronize the double blowing system with the age of the converter

Method used

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  • A long-life synchronous multiple blowing dephosphorization smelting method for high-phosphorus molten iron
  • A long-life synchronous multiple blowing dephosphorization smelting method for high-phosphorus molten iron
  • A long-life synchronous multiple blowing dephosphorization smelting method for high-phosphorus molten iron

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Effect test

Embodiment 1

[0042] The high-phosphorus molten iron long-life synchronous reblowing dephosphorization smelting method of this embodiment includes the following steps:

[0043] A. Loading the front furnace protection and leaving slag splashing:

[0044] The upper furnace steel tapping is completed, the converter reblowing synchronous furnace age is 6527 furnaces, the measured liquid level is 620mm, the liquid level is normal and the furnace bottom condition is normal, the tapping bottom blowing N2 low flow mode (250Nm 3 / h) Automatically switch to high flow mode (800Nm 3 / h), keep the bottom blowing air brick unblocked, refer to the furnace bottom rise requirements, press nitrogen pressure 1.0MPa, gun position 800mm splash slag for 2.5min, shake the furnace forward and backward for 100 minutes after slag splashing 0 The slag is kept to be generated by the bottom blowing metal mushroom head, and the following mass percentages are added after the slag is hung:

[0045] MgO28%, CaO%43%, SiO ...

Embodiment 2

[0063] The high-phosphorus molten iron long-life synchronous reblowing dephosphorization smelting method of this embodiment includes the following steps:

[0064] A. Loading the front furnace protection and leaving slag splashing:

[0065] The upper furnace steel tapping is completed, the synchronous reblowing furnace age of the converter is 12500 furnaces, the measured liquid level is 840mm, the bottom of the furnace is severely corroded, and the bottom blowing N2 low flow mode (250Nm 3 / h) Automatically switch to high flow mode (800Nm 3 / h), keep the bottom blowing air brick unblocked, and at the same time, lower the gun to splash the slag, press the nitrogen pressure of 0.9MPa, the gun position is 10500mm to splash the slag for 3 minutes, shake the furnace forward and backward for 100 minutes after the slag splashing is completed 0 The slag is kept to be generated by the bottom-blown metal mushroom head. After the slag is finished, the following mass percentage components ...

Embodiment 3

[0088] The high-phosphorus molten iron long-life synchronous reblowing dephosphorization smelting method of this embodiment includes the following steps:

[0089] A. Loading the front furnace protection and leaving slag splashing:

[0090] After the upper furnace tapping is completed, the filling liquid level is measured at 640mm. The condition of the furnace bottom and bottom blowing air brick is normal. The synchronous reblowing furnace age is 20200 furnaces. 3 / h) Automatically switch to high flow mode (800Nm 3 / h), keep the bottom blowing air brick unblocked, and at the same time, lower the gun to splash slag, press nitrogen pressure 1.0MPa, gun position 900mm, time 2.2min to splash slag, shake the furnace forward and backward 100 times after slag splashing 0 The slag is kept to be generated by the bottom blowing metal mushroom head, and the mass percentage component is added after the slag is hung:

[0091] MgO28%, CaO%43%, SiO 2 3.2%, the rest is other unavoidable imp...

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Abstract

The invention relates to a long-life synchronous double-blow dephosphorization smelting method for high-phosphorus molten iron, which comprises the following steps: loading into a front protection furnace and leaving slag splashing, loading, early-stage smelting, mid-term smelting, post-stage blowing, and converter tapping. The present invention fully exerts the effect of double blowing on the top and bottom of the converter through the integration and innovation of furnace bottom maintenance technology, charging system, oxygen supply system and slagging system, and achieves synchronization between the double blowing system and the long life of the converter and the smooth flow of high-phosphorus molten iron For the purpose of smelting, the oxygen content at the end of re-blowing is low (<500ppm), and the dephosphorization rate of the converter is increased from 93.68% to over 95.26%, which significantly reduces the consumption of steelmaking alloys and improves the quality of molten steel. The bottom blowing system is synchronized with the age of the converter , The complex blowing synchronous furnace age reaches more than 18,000 furnaces, which improves the technical and economic indicators of steelmaking and improves the comprehensive competitiveness of the enterprise.

Description

technical field [0001] The invention relates to a smelting method, in particular to a long-life synchronous reblowing and dephosphorization smelting method for high-phosphorus molten iron, which belongs to the technical field of iron and steel metallurgy manufacturing. Background technique [0002] Converter top-bottom combined blowing smelting technology is an advanced technology commonly used by domestic and foreign iron and steel enterprises. It can improve the balance of reactions in the converter smelting process and reduce the oxidation of molten steel at the end point, thereby uniformizing the reaction balance in the furnace and reducing splashing and shortening of the converter blowing process. Converter smelting time, reducing alloy consumption and slag consumption are important improvement directions for refined operation of converter steelmaking, and giving full play to the advantages of top-bottom combined blowing is an important way to improve molten steel qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36C21C7/00C21C7/06C21C7/064
CPCC21C5/35C21C5/36C21C7/0006C21C7/0025C21C7/06C21C7/064
Inventor 杨春雷张卫强张继斌陈伟陈寿红速国武杨锦文马军文文玉兵徐刚刘林刚
Owner WUKUN STEEL