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Method for preparing micro-nitrogen deoxidized alloy by using aluminum ash

A technology of micro-nitrogen deoxidation alloy and aluminum ash, which is applied in the field of metallurgy, can solve the problems of high cost of nitrogen increase and deoxidation, long environmental impact cycle, high cost of aluminum ash treatment, etc., and achieve resource utilization, good economic and social benefits , the effect of reducing the difficulty of refining

Pending Publication Date: 2022-02-18
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

[0010] In order to solve the existing problems of high nitrogen increase and deoxidation costs in rebar production, high aluminum ash treatment costs, and long environmental impact cycle, the present invention provides a method for producing micro-nitrogen deoxidized alloys using aluminum ash

Method used

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  • Method for preparing micro-nitrogen deoxidized alloy by using aluminum ash
  • Method for preparing micro-nitrogen deoxidized alloy by using aluminum ash
  • Method for preparing micro-nitrogen deoxidized alloy by using aluminum ash

Examples

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Effect test

Embodiment 1

[0038] A method for producing micro-nitrogen deoxidation alloys by using aluminum ash, fully mixing aluminum nitride ash and calcium oxide according to the ratio of 4:1, pressing balls and bagging, converting the steel type HRB400, the end point temperature is 1650°C, and tapping the converter Start to add at 1 / 3, the nitrogen content at the end point of the molten steel is 75ppm, the oxygen content is 540ppm, the dosage is added at 3kg / t, and the addition is completed when the steel is tapped to 2 / 3. The micro-nitrogen deoxidized alloy balls melt rapidly under the stirring of the steel flow, and the aluminum nitride in the aluminum ash decomposes rapidly, and the decomposed nitrogen [可溶] Increase the nitrogen content and decrease the oxygen content in molten steel. By the time of refining, the nitrogen content of liquid steel entering the station increased to 93ppm, and the oxygen content decreased to 50ppm, and the yields of ferrosilicon and silicon-manganese alloys increase...

Embodiment 2

[0040] A method for producing micro-nitrogen deoxidized alloys by using aluminum ash. The aluminum nitride ash and calcium oxide are fully mixed according to the ratio of 4:1, and the ball is packed into bags. The steel type HRB500 is smelted in a converter, and the end point temperature is 1670 ° C. The converter is tapped Adding starts at 1 / 3, the nitrogen content at the end point of molten steel is 70ppm, and the oxygen content is 580ppm. The micro-nitrogen deoxidized alloy balls melt rapidly under the stirring of the steel flow, and the aluminum nitride in the aluminum ash decomposes rapidly, and the decomposed nitrogen [可溶] Increase the nitrogen content and decrease the oxygen content in molten steel. By the time of refining, the nitrogen content of incoming steel liquid increased to 103ppm, and the oxygen content dropped to 55ppm. The yields of ferrosilicon and silicon-manganese alloys increased by 0.55% and 0.93% respectively. Under the condition of adding the same amou...

Embodiment 3

[0042] A method for producing micro-nitrogen deoxidation alloys by using aluminum ash. The aluminum nitride ash and calcium oxide are fully mixed according to the ratio of 4:1, and the ball is packed into bags. The steel type HRB400 is smelted in a converter, and the end point temperature is 1690 ° C. The converter is tapped. Start to add at 1 / 3, the nitrogen content at the end point of the molten steel is 60ppm, the oxygen content is 650ppm, the dosage is added at 8kg / t, and the addition is completed when the steel is tapped to 2 / 3. The micro-nitrogen deoxidized alloy balls melt rapidly under the stirring of the steel flow, and the aluminum nitride in the aluminum ash decomposes rapidly, and the decomposed nitrogen [可溶] Increase the nitrogen content and decrease the oxygen content in molten steel. By the time of refining, the nitrogen content of liquid steel entering the station increased to 115ppm, and the oxygen content decreased to 48ppm. The yields of ferrosilicon and sil...

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Abstract

The invention discloses a method for preparing a micro-nitrogen deoxidized alloy by using aluminum ash, which belongs to the technical field of metal smelting. According to the method, the aluminum ash is treated by adopting a dry method, the aluminum ash and calcium oxide are uniformly mixed at high temperature, volatile components in the aluminum ash are fully treated and absorbed, most of aluminum in the aluminum ash is converted into aluminum nitride, the aluminum nitride is added in the steel-making tapping process after being pressed into balls by high-strength ball pressing equipment, and harmful aluminum nitride and fluoride in the aluminum ash are subjected to high temperature in the steel-making link, nitrogen in the aluminum nitride is converted into nitrogen, and resource utilization of the nitrogen is realized; and meanwhile, the fluoride is subjected to curing treatment and used for slagging in the steel-making slag washing and refining process, the aluminum ash is prepared into the micro-nitrogen deoxidized alloy, resource utilization of solid waste is achieved, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing a micro-nitrogen deoxidized alloy by using aluminum ash. Background technique [0002] Vanadium-nitrogen alloys are mainly used as additives for rebar alloys. Vanadium is added to steel to improve the performance of steel and reduce costs. In the production process of vanadium-nitrogen alloy additives, the process of carbonization reduction and nitriding process is the key to determine the quality of vanadium-nitrogen alloy additives. . Generally speaking, after the vanadium-nitrogen alloy is added to the steel, part of it is dissolved in the matrix to produce solid solution strengthening; the other part combines with C and N to form V (C, N) and precipitates on the matrix and grain boundaries, resulting in Precipitation strengthening hinders ferrite grain growth. At the same time, the V (C, N) precipitated between the phases can be used as...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/00
CPCC21C7/06C21C7/0006Y02P10/20
Inventor 梁金鹏魏国立朱青德
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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