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A semi-steel silicon-increasing treatment method and semi-steel converter steelmaking method

A converter steelmaking and silicon treatment technology, applied in the field of semi-steel silicon-increasing treatment and semi-steel converter steelmaking, can solve the problems of large amount of auxiliary materials added to the converter and low recycling rate of scrap steel, saving economic costs and ensuring smooth progress. , the effect of solving the problem of recycling

Active Publication Date: 2016-03-23
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the low recycling rate of steel scrap due to the large amount of converter auxiliary materials added in the semi-steel converter steelmaking process in the prior art, and to provide a method for silicon-increasing treatment of semi-steel, and a A kind of semi-steel converter steelmaking method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 140t of semi-steel after desulfurization and vanadium extraction (its composition is: 0.012% by weight Si, 3.60% by weight C, 0.032% by weight Mn, 0.03% by weight V, 0.010% by weight S, 0.077% by weight P, and the balance is Fe) Blended into the 120t converter, and before the semi-steel is blended into the converter, 2.0kg / ton of semi-steel ferrosilicon alloy is added to the ladle along with the semi-steel flow during the process of semi-steel output after desulfurization and vanadium extraction. Flush to make ferrosilicon evenly dissolve in semi-steel for silicon-increasing treatment;

[0039] Among them, the silicon content of the ferrosilicon alloy is 75% by weight; the ferrosilicon alloy is added to the semi-steel after desulfurization and vanadium extraction, so that the yield of silicon is 81% by weight, and the silicon content of the semi-steel is 0.15% by weight; the converter is put into the furnace The temperature is 1346°C, and the carbon content in the furna...

Embodiment 2

[0042] 140t of semi-steel after desulfurization and vanadium extraction (its composition is: 0.015% by weight of Si, 3.60% by weight of C, 0.032% by weight of Mn, 0.03% by weight of V, 0.010% by weight of S, 0.077% by weight of P, and the balance is Fe) Blended into the 120t converter furnace, and before the semi-steel is blended into the converter, 2.3kg / ton of semi-steel silicon carbide is added to the ladle along with the semi-steel flow during the process of semi-steel output after desulfurization and vanadium extraction, and mixed with molten steel Flush to make ferrosilicon evenly dissolve in semi-steel for silicon-increasing treatment;

[0043] Among them, the silicon content of silicon carbide is 75% by weight; after adding silicon carbide to the semi-steel after desulfurization and vanadium extraction, the yield of silicon is 85% by weight, and the silicon content of the semi-steel is 0.18% by weight; The furnace temperature is 1355°C, and the carbon content in the fu...

Embodiment 3

[0046] 140t of semi-steel after desulfurization and vanadium extraction (its composition is: 0.020% by weight Si, 3.60% by weight C, 0.032% by weight Mn, 0.03% by weight V, 0.010% by weight S, 0.077% by weight P, and the balance is Fe) Blended into the 120t converter, and before the semi-steel is blended into the converter, 2.7kg / ton of semi-steel ferrosilicon alloy is added to the ladle along with the semi-steel flow during the process of semi-steel output after desulfurization and vanadium extraction. Flush to make ferrosilicon evenly dissolve in semi-steel for silicon-increasing treatment;

[0047] Among them, the silicon content of the ferrosilicon alloy is 75% by weight; after the ferrosilicon alloy is added to the semi-steel after desulfurization and vanadium extraction, the yield of silicon is 90% by weight, and the silicon content of the semi-steel is 0.23% by weight; The furnace temperature is 1355°C, and the carbon content in the furnace is 3.5 wt%. After magnesia l...

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Abstract

The invention discloses a method of semisteel silicon increasing processing and a method of semisteel converter steelmaking by adopting the method of semisteel silicon increasing processing. The method of semisteel silicon increasing processing comprises the steps of adding a silicon increasing agent into semisteel which is subjected to vanadium extraction and / or desulfurization to carry out silicon increasing processing, wherein the silicon increasing agent is ferrosilicon alloy and / or silicon carbide. The method of the semisteel silicon increasing processing, disclosed by the invention, has the advantages that the steel scrap recycling problem of steel mills can be effectively solved through adding the ferrosilicon alloy and / or the silicon carbide into the semisteel which is subjected to the vanadium extraction and / or the desulfurization; moreover, the consumption of converter auxiliary materials can be effectively reduced; by adopting the method provided by the invention, the production can be smoothly carried out, the steel production process and production organization are not influenced, an important technical support is provided for the comprehensive utilization of waste resources of the steel mills and the economic cost is effectively saved.

Description

technical field [0001] The invention relates to a method for silicon-increasing treatment of semi-steel in the process of "desulfurization-converter furnace vanadium extraction-converter steelmaking" and a method for semi-steel converter steelmaking using the method, belonging to the field of iron and steel metallurgy. Background technique [0002] For molten iron with high vanadium content, vanadium-titanium molten iron should be extracted before converter steelmaking, and then semi-steel after vanadium extraction is sent to converter for steelmaking. Compared with ordinary molten iron, the physical and chemical properties of semi-steel The heat sources are all low, resulting in a tight heat source for converter steelmaking. Therefore, when semi-steel steelmaking is used, the amount of scrap steel added to the converter is low, and when ordinary steel is smelted, the amount of scrap steel added is generally 5kg / ton steel to 20kg / ton steel. When smelting low-phosphorus or l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C5/28
CPCY02P10/20
Inventor 杨星地曾建华李扬州龚洪君杨森祥杜利华陈均李平凡翁建军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP