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Method for increasing recovery rates of precious alloy elements

A precious alloy and recovery rate technology, applied in the manufacture of converters, etc., can solve the problems of low success rate and achieve the effect of increased recovery rate, significant effect, and significant economic benefits

Inactive Publication Date: 2015-01-28
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you want to increase the end point C and reduce the oxygen in the converter, you will have high requirements for the steelmaker's operation level and raw materials, and the success rate is low

Method used

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  • Method for increasing recovery rates of precious alloy elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: (following percentages are percentages by weight)

[0019] The target value of Nb content of pressure vessel steel "Q370R" is 0.025%, and the Nb content of ferroniobium is 60%:

[0020] 1) During the tapping process of the converter, add alloys containing Mn, Si, and Al elements to the molten steel according to the normal process (the addition amount is the same as the original process) for deoxidation alloying, and control the oxygen content of the molten steel after tapping the converter to 10-50ppm.

[0021] (2) After the molten steel truck arrives at the argon station, increase the amount of bottom blowing argon until the exposed diameter of the molten steel is 400-700mm.

[0022] (3) Add ferroniobium to the exposed part of the molten steel while blowing argon gas at the bottom and stir. The amount of ferroniobium added is reduced from 0.45kg per ton of steel in the original process to 0.43kg per ton of steel. Melting creates conditions for the alloy ...

Embodiment example 2

[0025] The V content target value of the oil storage tank steel "12MnNiVR" is 0.045%, and the Ni content target value is 0.25%; the vanadium iron contains 60% V, and the nickel plate contains 99.98% Ni:

[0026] 1) During the tapping process of the converter, add an alloy containing Mn, Si, and Al to the molten steel for deoxidation and alloying according to the normal process, and control the oxygen content of the molten steel after tapping the converter to 10-50ppm.

[0027] (2) After the molten steel truck arrives at the argon station, increase the amount of bottom blowing argon until the exposed diameter of the molten steel is 400-700mm.

[0028] (3) Add nickel plate and ferrovanadium to the exposed part of the molten steel while blowing argon gas at the bottom and stirring, the amount of ferrovanadium added is reduced from 0.81kg per ton of steel in the original process to 0.77kg per ton of steel, and the amount of nickel plate added is reduced from the original process. ...

Embodiment example 3

[0031] The Mo content target value of the pressure vessel steel "15CrMoR" is 0.50%, and the Mo content in ferromolybdenum is 60%:

[0032] 1) During the tapping process of the converter, add an alloy containing Mn, Si, and Al to the molten steel for deoxidation and alloying according to the normal process, and control the oxygen content of the molten steel after tapping the converter to 10-50ppm.

[0033] (2) After the molten steel truck arrives at the argon station, increase the amount of bottom blowing argon until the exposed diameter of the molten steel is 400-700mm.

[0034] (3) Add ferromolybdenum to the exposed part of the molten steel while blowing argon at the bottom and stir, the amount of ferromolybdenum added is reduced from 8.77kg per ton of steel in the original process to 8.50kg per ton of steel, and argon is blown for 2-3min to promote ferromolybdenum pretreatment. Melting creates conditions for the alloy to melt quickly and fully during the refining process of ...

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Abstract

The invention relates to a method for increasing recovery rates of precious alloy elements. The problem that the recovery rates of the precious alloy elements in the existing converter steelmaking-low frequency (LF) furnace refining process need to be increased is solved. According to the technical scheme, the method comprises converter steel tapping, deoxidation alloying and LF furnace refining; in the converter steel tapping process, deoxidation alloys and common alloys are added into molten steel for performing deoxidation alloying, and the oxygen content of the molten steel which is produced by controlling the converter steel tapping is between 10 and 50ppm; the molten steel is conveyed to an argon station, and alloying precious alloys are added into the molten steel while argon is introduced into the argon station and stirred at the same time so as to increase the pre-melting of precious alloys; finally, the molten steel is conveyed into the LF furnace for refining until the alloy elements reach the standard range of steel grade components. The method is simple in process and convenient to operate; moreover, the recovery rates of the precious alloy elements can be effectively increased.

Description

technical field [0001] The invention relates to iron and steel smelting technology, in particular to a method for improving the recovery rate of precious alloy elements in the iron and steel smelting process. Background technique [0002] Alloying precious alloys such as Nb, V, Ni, Mo and other elements have an irreplaceable effect on improving the performance of steel. Many steel types must be alloyed with precious alloying elements, and the price of this type of alloy is relatively high, and its recovery rate is directly Affects the production cost of steel grades. In order to reduce the cost of alloying, a lot of domestic research has been done on the technology of improving the alloy recovery rate, but they all start from the aspects of increasing the end point C of the converter and reducing the tapping oxygen of the converter. If you want to improve the end point C and reduce the oxygen in the converter, you will have high requirements on the steelmaker's operating le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/072
Inventor 潘建设黄道昌吴本胜
Owner 武钢集团有限公司