Steel slag modifier as well as preparation and use methods thereof

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

Active Publication Date: 2021-07-16
SICHUAN PAN YAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves how well molten iron from blast furnace steels becomes solidified when they are being processed by rolling mill equipment. It involves adding certain chemical agents called soda ash or sodium fluorite into the liquid before casting on top of the castings made up of these materials for better performance. By breaking down the material at high temperatures, this modification makes the steel smoother and more easily flows over them without damaging their surfaces. Additionally, modifying the chemistry of the treatment may also enhance the effectiveness of other treatments like plasma spray coating or heat transfer techniques used to reduce oxygen content inside the steel product's interior. Overall, this innovations help prevent damage caused by excessive atmospheric conditions such as temperature fluctuate and moisture levels affecting the quality control processes involved in manufacturing steel products.

Problems solved by technology

Technological Problem addressed in this patents relating to the use of modifiers for controlling the behavior of molar ratios or specific elements like magnesia and zinc in steelmaking processes such as electric arc remoldings. These modifications aimed towards enhancing these characteristics without affecting important factors associated with the quality of cast products made from the steel plate called LSURGAL IF type ALC.

Method used

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  • Steel slag modifier as well as preparation and use methods thereof
  • Steel slag modifier as well as preparation and use methods thereof
  • Steel slag modifier as well as preparation and use methods thereof

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preparation example Construction

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

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

[0033] b. Prepare steel slag modifier pellets with a size of 10-20mm by dry-type briquetting with a powerful briquetting machine;

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

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

[0036] The amount of lime added in converter tapping ladle slag washing is controlled by 800kg-1000kg / furnace, and steel slag modifier is added 1-3 minutes after tapping, and the addition amount is 450-550kg / furnace; Then st...

Embodiment 1

[0041] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.48% of C, 0.039% of Mn, 0.065% of P, 0.005% of S, 0.015% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0042] Specific steps:

[0043] (1) Put 23 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom combined blowing converter, and use the function of the top-bottom combined blowing converter to blow oxygen and decarburize 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°C, the thick slag begins to be tapped into the ladle.

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

Embodiment 2

[0050] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.72% of C, 0.036% of Mn, 0.068% of P, 0.005% of S, 0.017% V and traces 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 combined blowing converter, and use the function of the top-bottom combined blowing converter to blow oxygen and decarburize 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°C, the thick slag begins to be tapped into the ladle.

[0053] (2) Lime is added 1 minute after tapping, and the lime addition is completed 1 minute after tapping begins. A tota...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a steel slag modifier as well as preparation and use methods thereof. In order to solve the problems that an existing steel slag modifier is poor in melting effect, low in steel ladle slag oxidability reducing capacity, unfavorable for environmental protection and service life of refractory materials and the like, the invention provides the steel slag modifier which comprises the following components in percentage by weight: 40-50% of CaCO3, 40-50% of Al and 5-7% of sodium hexafluorochlorate. And the auxiliary material forming binding agent accounts for 0.5-2% of the total weight of the main materials. The invention also provides a preparation method and a use method of the steel slag modifier, and the steel slag modifier is suitable for high-grade aluminum deoxidized steel, such as IF steel and pipeline steel of X70 and above, and is used for improving the slag state and reducing the oxidability of steel ladle slag.

Description

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Claims

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Application Information

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Owner SICHUAN PAN YAN TECH
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