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A method for temperature compensation at the end point of converter blowing

A terminal temperature, converter blowing technology, applied in the direction of manufacturing converters, etc., can solve the problems of decreased alloy yield, prolonged smelting cycle, molten steel peroxidation, etc., to achieve improved alloy yield, shortened smelting cycle, and molten steel temperature. boosted effect

Active Publication Date: 2021-06-22
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the existing converter blowing end point to compensate for the severe blowing after tapping temperature, resulting in molten steel peroxidation, alloy yield decrease, iron loss increase, smelting cycle extension and other problems, the present invention provides a method for converter blowing end point temperature compensation

Method used

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  • A method for temperature compensation at the end point of converter blowing
  • A method for temperature compensation at the end point of converter blowing

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a method for temperature compensation at the end of converter blowing includes the following steps:

[0031] (1) Measure the carbon content, oxygen content and the end point temperature of the molten steel by the sub-lance of the converter. If the final tapping temperature is met, the steel is directly tapped. Compensation; the final tapping temperature of molten steel is different according to the requirements of different steel types, and is set according to the specific steel type.

[0032] (2) After measuring the temperature of molten steel, when the oxygen supply intensity is 3.2Nm 3Ferrosilicon alloy is added to molten steel under the condition of / (min·t), preferably, the ferrosilicon alloy is a ferrosilicon alloy with a silicon content of 72.5%; the amount of the ferrosilicon alloy is 0.07kg per 1°C of temperature rise. / t~0.08kg / t; ferrosilicon alloy with high calorific value is used as the exothermic agent, the exothermic element s...

Embodiment 2

[0037] Basically the same as in Example 1, preferably, the ferrosilicon alloy is added into the converter through a high-level silo, the high-level silo includes an alloy silo, the alloy silo is connected to the diversion pipe through a valve, and a resistance wire mesh is arranged in the alloy silo ;When in use, the resistance wire mesh is energized in advance and burned to a red-hot state when feeding is required. The ferrosilicon alloy in the woven bag is hoisted and falls on the resistance wire mesh. The bottom of the woven bag is burnt, and the ferrosilicon alloy falls into the alloy silo. When the valve is opened, the ferrosilicon alloy flows into the converter through the diversion pipe, which realizes the online adjustment of the ferrosilicon alloy during the molten steel smelting process. The whole feeding process does not need to be powered off and other operations, so that the operation of adding the ferrosilicon alloy to the converter is simple and fast, improving W...

Embodiment 3

[0040] When the converter is blowing to the end, since the residual heating elements in the steel mainly include C and Mn content are oxidized to a low level, by adding a ferrosilicon alloy with a higher heating value and a silicon content of 72.5% into the converter as a heating agent, Use the chemical heat generated by the reaction of the heating element silicon and oxygen to increase the temperature of the molten steel in the converter pool, and the silicon in the ferrosilicon heating agent reacts with oxygen to form SiO 2 Entering the slag has almost no effect on the composition of the rough smelting molten steel, which is conducive to improving the physical quality of the molten steel. Through the statistics and analysis of a large number of experimental data, the present invention measures the corresponding relationship between the carbon content of different endpoints and the oxygen level of molten steel, the excess index of the ferrosilicon heating agent when it reaches...

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Abstract

The invention discloses a method for temperature compensation at the end point of converter blowing, and belongs to the technical field of converter steelmaking. Aiming at the existing converter blowing end point to compensate for the tapping temperature, blowing seriously leads to molten steel peroxidation, alloy yield reduction, long cycle and other problems, the present invention provides a converter blowing key temperature compensation method, which includes the converter Measure the temperature of molten steel at the middle and end points. If the temperature does not meet the requirements for tapping, then add ferrosilicon alloy to the converter at a rate of 0.07kg / t~0.08kg / t for every 1°C of temperature rise; and add ferrosilicon alloy at a rate of 1.1°C / s The oxygen blowing operation is carried out on the molten steel at a heating rate of ~1.2°C / s, and the oxygen blowing time is determined by the temperature difference of the molten steel temperature; after the oxygen blowing operation, the molten steel is sampled and measured, and the steel is tapped normally after meeting the requirements. The invention uses ferrosilicon alloy as the exothermic agent, utilizes the chemical heat generated by the reaction of silicon element and oxygen to increase the temperature of molten steel in the converter, and achieves the purpose of saving energy and reducing consumption on the premise of ensuring that the end temperature of converter blowing meets the target tapping temperature.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking technology, and more specifically relates to a method for temperature compensation at the end point of converter blowing. Background technique [0002] The heat balance of the converter steelmaking process refers to the balance between the heat income item mainly including the physical heat and chemical heat of molten iron, and the heat expenditure item mainly including the physical heat of molten steel, slag, furnace gas, melting and decomposition heat of coolant, etc. The quality of its condition has an important impact on the slagging process of converter blowing, melting of scrap steel, chemical reaction between slag and steel, hit rate of blowing end point, and physical quality of molten steel. Affected by the market situation and the price of raw materials, some iron and steel companies adopt the cooling system of "fixing scrap steel and adjusting ore" for converters, and add m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/00
CPCC21C5/30C21C7/005
Inventor 潘军吴坚邓南阳杨应东张旭
Owner MAANSHAN IRON & STEEL CO LTD
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