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Method for blowing steel ladle top slag modifier by using CO2

A technology for ladle top slag and CO2, applied in the field of iron and steel smelting, can solve the problems of high production cost of ladle top slag modifier, affecting the normal refining of molten steel, difficulty in driving a spray gun, etc., so as to improve dynamic conditions, reduce waste of resources and environment. Pollution, to ensure the effect of normal refining

Pending Publication Date: 2022-06-03
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a method using CO 2 The method of spraying the ladle top slag modifier is aimed at solving the high production cost of the ladle top slag modifier, which is easy to form ladle top slag encrustation when adding the ladle top slag modifier. The use of a rotary powder spraying device to add the modifier will cause difficulty in driving the spray gun. The serious defect of sticky slag, and the high cost and poor effect of using inert gas as the carrier gas, thus affecting the normal refining of molten steel

Method used

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  • Method for blowing steel ladle top slag modifier by using CO2
  • Method for blowing steel ladle top slag modifier by using CO2
  • Method for blowing steel ladle top slag modifier by using CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

The invention is applied to the upgrading of 60-ton converter ladle top slag in a factory, the average tapping volume is 60 tons, the test steel grade is HPB300, and the limestone powder with a particle size of 0-20 mm after being sieved, and the solid waste produced by an electrolytic aluminum factory The aluminum ash is crushed to a particle size between 0 and 20 mm, and then the above limestone powder ore and aluminum ash are ball-milled to a particle size of less than 1 mm. %, Al 2 O 3 : 15% to 25%, mechanically mix it and add it to the powder silo 7. After the converter is tapped, the ladle 1 is transported to the bottom of the top blowing lance 2, the lift control system 3 on the upper part of the top blowing lance is driven, the top blowing lance 2 is lowered and inserted into the ladle 1 5-50 mm below the top slag level, and the top is lowered. Turn on the carrier gas while blowing the spray gun 2 to prevent the top blowing spray gun 2 from being blocked. After the to...

Embodiment 2

The invention is applied to the upgrading of 180-ton converter ladle top slag in a factory, the average tapping amount is 195 tons, the test steel grade is HRB400E, and the top slag composition after tapping is shown in the following table:

The sieved limestone powder with a particle size of 0-20mm and the solid waste aluminum ash produced by an electrolytic aluminum plant are crushed to a particle size of 0-20mm, and then the above limestone powder ore and aluminum ash are ball-milled to a particle size of less than 1mm. , the components are calculated in mass percentage, CaO: 40% to 50%, Al: 30% to 50%, Al 2 O 3 ≤10%, SiO 2 ≤4%, mix it mechanically and add it to powder silo 7. After the converter is tapped, the ladle 1 is transported to the bottom of the top blowing lance 2, the lift control system 3 on the upper part of the top blowing lance 2 is driven, the top blowing lance 2 is lowered and inserted into the ladle 1 5-50 mm below the top slag liquid level, and the d...

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Abstract

The invention discloses a method for blowing a steel ladle top slag modifier by using CO2, which comprises the following steps: respectively crushing and ball-milling limestone fine ore and aluminum ash, mechanically and uniformly mixing the obtained powder according to a certain proportion to prepare the steel ladle top slag modifier, and after tapping of a converter, spraying the prepared steel ladle top slag modifier and modified steel ladle top slag through a blowing device. The blowing device comprises a top-blowing spray gun arranged at the top of the steel ladle, CO2 is introduced into an inner cavity of the top-blowing spray gun to serve as carrier gas and stirring gas, a refractory material layer is arranged at the end, inserted into the steel ladle, of a blowing head of the top-blowing spray gun, the top-blowing spray gun is controlled to ascend and descend through a lifting control system, and the top of the top-blowing spray gun is connected with a discharging valve at the bottom of a powder spraying tank through a discharging pipe. The top of the powder spraying tank is connected with a powder bin through a feeding pipe. The modifier disclosed by the invention is prepared by crushing, ball-milling and mixing industrial waste limestone powder and aluminum ash, the cost is low, and CO2 gas is adopted for injection, so that the problems of molten steel splashing and slag and steel sticking at a steel ladle opening are avoided.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, and in particular to a CO 2 The method of spraying ladle top slag modifier. Background technique [0002] High-quality limestone is widely used as an auxiliary material for steelmaking in metallurgical enterprises, but in the process of limestone mining, crushing, and transportation, a large amount of fine ore will be produced. Because calcined limestone can only be produced by using lumps, a large amount of crushed materials cannot be used, which will cause waste of resources and waste. Environmental pollution; industrial aluminum ash is the waste generated in the process of aluminum electrolysis, aluminum processing and recycled aluminum processing. However, limestone contains high CaO, and aluminum ash contains high aluminum and its oxides, both of which can be used in deoxidation and slagging of steelmaking processes. [0003] Although the molten steel takes slag blocking me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/04
CPCC21C7/04C21C7/0037C21C7/00Y02P10/20
Inventor 富志生魏国立杨永刚王永刚慕进文宋宗亮王军宏颜威山
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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