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Semisteel dephosphorizing agent, semisteel dephosphorizing method and steel smelting method thereof

A steel dephosphorization agent and a technology for producing semi-steel, which is applied in the field of semi-steel steelmaking, can solve the problems of increased process time, large loss of molten steel temperature, and large consumption of iron and steel materials and slag materials, so as to reduce the burden of dephosphorization and reduce dephosphorization. cost, the effect of optimizing the steelmaking process

Active Publication Date: 2015-02-25
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

Although this method can produce low-phosphorus steel, it uses two additions of dephosphorization agent, and slag is dumped in the middle of converter smelting, resulting in increased process time, large loss of molten steel temperature, large consumption of steel and slag materials, and unstable control of phosphorus at the end of the converter.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] In this example, the composition of the semi-steel dephosphorizer is calculated by weight percentage: CaO25%, CaSO 4 46%, CaF 2 10%, SiO 2 4%, FeO15%, particle size 5mm, moisture content 0.5wt%.

[0030] After the vanadium is extracted by the converter, the [P] content of the semi-steel is 0.077%. After the vanadium is extracted, the semi-steel dephosphorization agent of the above composition is added to the ladle with the steel flow. The amount of the semi-steel dephosphorization amount added is 0.3% of the molten steel weight . Then, the semi-steel is desulfurized and slag removed at the desulfurization station, and the [P] content of the semi-steel is 0.046%.

example 2

[0032] In this example, the composition of the semi-steel dephosphorizer is calculated by weight percentage: CaO20%, CaSO 4 53%, CaF 2 25%, SiO 2 2%, FeO20%, particle size 5mm, moisture content 0.5wt%.

[0033] After the vanadium is extracted by the converter, the [P] content of the semi-steel is 0.070%. After the vanadium is extracted, the semi-steel dephosphorization agent of the above composition is added to the ladle with the steel flow. The amount of the semi-steel dephosphorization amount added is 0.4% of the molten steel weight . Then, the semi-steel is desulfurized at the desulfurization station and the slag is removed. The [P] content of the semi-steel is 0.038%.

example 3

[0035] In this example, the composition of the semi-steel dephosphorizer is calculated by weight percentage: CaO25%, CaSO 4 49%, CaF 2 10%, SiO 2 1%, FeO15%, particle size 4mm, moisture content 0.5wt%.

[0036] After the vanadium is extracted by the converter, the [P] content of the semi-steel is 0.073%. After the vanadium is extracted, the semi-steel dephosphorization agent of the above composition is added to the ladle with the steel flow. The amount of the semi-steel dephosphorization dosage is 0.5% of the molten steel weight . Then, the semi-steel is desulfurized at the desulfurization station and the slag is removed. The [P] content of the semi-steel is 0.036%.

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Abstract

The invention provides a semisteel dephosphorizing agent, a semisteel dephosphorizing method and a steel smelting method thereof. The dephosphorizing agent is prepared from the following ingredients in parts by weight: 20-35 parts of CaO, 30-50 parts of CaSO4, 5-15 parts of CaF2, no more than 6 parts of SiO2 and 10-20 parts of FeO. The steel smelting method comprises the steps of smelting vanadium-containing iron ore to obtain vanadium-containing molten iron; carrying out vanadium extraction smelting on the vanadium-containing molten iron by using a converter; after the vanadium extraction smelting is ended, tapping semisteel into a ladle, and adding the semisteel dephosphorizing agent into steel flow during semisteel tapping (e.g. when the steel is tapped by about 1 / 5), wherein the quantity of the added semisteel dephosphorizing agent accounts for 0.3-1.0% of the weight of the semisteel; carrying out desulfurization on the semisteel so as to remove desulphurization slag and dephosphorization slag; carrying out converter steel smelting and secondary refining. The semisteel dephosphorizing agent, the semisteel dephosphorizing method and the steel smelting method thereof have the advantages that the dephosphorizing cost can be reduced, the dephosphorization burden of the converter is lightened greatly, and the steel smelting process is optimized.

Description

Technical field [0001] The present invention relates to the technical field of semi-steel steelmaking. Specifically, it relates to a dephosphorizing agent suitable for semi-steel obtained after vanadium extraction from a converter, and a dephosphorizing agent for semi-steel obtained after vanadium extraction from a converter. A method of dephosphorization and a steelmaking method using the dephosphorization agent. Background technique [0002] With the progress and development of society, all walks of life gradually put forward higher requirements for steel quality. In recent years, the surface hardening high-quality alloy steel, deep-drawing steel, ultra-low carbon IF steel, bearing steel, petroleum pipeline steel and marine steel, which have increased in demand in recent years, have high requirements for the phosphorus content in the steel. For example, oil pipelines, natural gas pipelines, offshore oil production platforms, aviation steels and large-section steel parts in hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 曾建华陈永张敏龚洪君戈文荪杨森祥王建杜利华黄德胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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