Steel slag modifier and preparation and use method thereof

A technology of modifier and steel slag, which is applied in the field of iron and steel metallurgy, can solve the problems of low oxidizing ability and poor melting effect of steel slag, and achieve the effects of improving effective utilization rate, improving ductility, and improving slag state

Active Publication Date: 2022-08-05
SICHUAN PAN YAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problems to be solved by the present invention are: the existing steel slag modifiers have problems such as poor melting effect and low ability to reduce the oxidation of steel slag

Method used

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  • Steel slag modifier and preparation and use method thereof
  • Steel slag modifier and preparation and use method thereof
  • Steel slag modifier and preparation and use method thereof

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preparation example Construction

[0031] The present invention also provides a preparation method of the above-mentioned steel slag modifier, comprising the following steps:

[0032] a. Dry mixing material, mix and stir the main material and dry material for 8-10 minutes, then add the auxiliary material forming binder dry material and mix and stir for 5-7 minutes to prepare a dry mixture;

[0033] b. The steel slag modifier pellets are prepared by dry briquetting of a powerful briquetting machine, with a size of 10-20mm;

[0034] c. Screening, sieving the steel slag modifier pellets with a sieve with a 5mm mesh opening, and selecting the steel slag modifier pellets with a particle size larger than 5 mm as the steel slag modifier pellets.

[0035] The present invention also provides a method for using the above-mentioned steel slag modifier, comprising the following steps:

[0036] The amount of lime-washing slag in the converter tapping ladle is controlled by 800kg-1000kg / furnace, and the slag modifier is add...

Embodiment 1

[0041] Using the semi-steel obtained by extracting vanadium and desulfurization from the vanadium-titanium-containing molten iron as the raw material, the initial molten steel is smelted, wherein the semi-steel contains 3.48% C, 0.039% Mn, 0.065% P, 0.005% S, 0.015% V and trace amounts of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0042] Specific steps:

[0043] (1) Add 23 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom double-blowing converter, and use the top-bottom double-blowing converter's function of oxygen blowing and decarburization to initially smelt the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.038wt%, a Mn content of 0.027wt%, a P content of 0.0072wt%, a S content of 0.0061wt%, and a temperature of 1660 ℃, the thick slag begins to tap into the ladle.

[0044] (2) Lime was added after 1 minute of tapping, and the addition of lime was comple...

Embodiment 2

[0050] Using semi-steel obtained from vanadium-titanium-containing molten iron extracting vanadium and desulfurization as a raw material, the initial molten steel is made, wherein the semi-steel contains 3.72% C, 0.036% Mn, 0.068% P, 0.005% S, 0.005% S, 0.017% V and trace amounts of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0051] Specific steps:

[0052] (1) Add 243 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom double-blowing converter, and use the top-bottom double-blowing converter's function of oxygen blowing and decarburization to initially smelt the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.037wt%, a Mn content of 0.020wt%, a P content of 0.0082wt%, a S content of 0.0061wt%, and a temperature of 1675 ℃, the thick slag begins to tap into the ladle.

[0053] (2) Lime was added after 1min of tapping, and the addition of lime was completed 1min ...

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Abstract

The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a steel slag modifier and a preparation and use method thereof. Aiming at the problems existing in the existing steel slag modifier, such as poor melting effect, low ability to reduce ladle slag oxidation, and unfavorable environmental protection and service life of refractory materials, the present invention provides a steel slag modifier, which is composed of: Weight percent, CaCO 3 40%-50%, Al 40%-50%, sodium hexafluorochlorate: 5-7%; auxiliary material forming binder accounting for 0.5%-2% of the total weight of the main material. The invention also provides a preparation method and a use method of the above steel slag modifier, which is suitable for high-grade aluminum deoxidized steel, such as IF steel, X70 and above pipeline steel, to improve slag state and reduce ladle slag oxidation.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a steel slag modifier and a preparation and use method thereof. Background technique [0002] Panzhihua Iron and Steel Co., Ltd. has always had problems with high melting point and serious crusting in the control of steel slag in the production process of ultra-low carbon steel. At the same time, the oxidizing property is high, and the FeO content is large, and the proportion is more than 15%. [0003] The existence of the above problems will lead to poor coverage and protection effect of steel slag, which is not conducive to the adsorption and removal of inclusions, and is easy to cause secondary oxidation of molten steel. incentives. [0004] Under the existing process conditions, the slag is in the high melting point region, which is not conducive to the adsorption of inclusions in the steel. The actual inspection and comparison results also show...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/072C21C7/10C22B1/242
CPCC21C7/06C21C7/0006C21C7/072C21C7/10C22B1/242C22B1/2406
Inventor 周伟尹晶晶余灿生王敏莉
Owner SICHUAN PAN YAN TECH
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