Steel making final slag adjustment and preparation method and application method thereof

A technology of regulator and final slag, which is applied in the manufacture of converters, etc., can solve the problems of large temperature drop of molten steel and high production cost, and achieve the effects of small temperature drop of molten steel, lower TFe content, and lower production cost

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, also because the converter steelmaking final slag modifier contains more CaCO 3 , in the actual use process, the temperature drop of molten steel is relatively large, and it contains more components such as Mg and Al, and the production cost is relatively high

Method used

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  • Steel making final slag adjustment and preparation method and application method thereof

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preparation example Construction

[0024] The preparation method of the spherical particles can be carried out by various methods known in the art. For example, the mixture obtained by mixing MgO source, C source, Si source and Fe source can be fully mixed with the binder (according to needs, water can also be added), and then pressed by a ball press to form an average diameter of 20 to 60 mm. (preferably 30-40 mm) spherical particles, and then dried. The drying can be a well-known method in the art, for example, the obtained spherical particles can be dried at 200-300° C. for 1-2 hours.

[0025] According to the present invention, the added amount of the binder can be determined according to the weight of the mixture obtained by mixing the MgO source, the C source, the Si source and the Fe source. Usually, the added amount of the binder is 3-5.5% by weight, preferably 4-5.5% by weight, of the total weight of the mixture (a mixture of MgO source, C source, Si source and Fe source).

[0026] The adhesive can b...

Embodiment 1～4

[0034] Mix the MgO source, C source, Si source and Fe source evenly to get the final slag modifier for steelmaking, and mix the final slag modifier for steelmaking with binder and water evenly, and make the average diameter 35mm spherical particles, and then dried at 250°C for 1.5 hours to obtain a granular final slag regulator for steelmaking. Wherein, the types and contents of the above-mentioned raw materials are shown in Table 1.

[0035] Table 1

[0036]

Embodiment 5

[0038] In a 120-ton converter, the molten steel intake and output is 130t. After the converter blowing is finished and before the steel is ready for tapping, the final slag regulator for steelmaking obtained in Example 1 is added, and the amount added is 2 kg per ton of molten steel. After sampling and analysis, the TFe content in the slag dropped from 24% by weight to 20% by weight. In addition, the temperature of molten steel dropped from 1680°C to 1678°C, almost unchanged. In addition, the oxidizability of the slag is effectively reduced, and the components in the molten steel meet the steel composition requirements after tapping is completed, and the final slag splashing effect of the converter is better.

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Abstract

The invention discloses a steel making final slag adjustment agent and a preparation method and an application method thereof, and wherein the steel making final slag adjustment agent comprises 73 to 85 wt% of MgO, 8 to 14 wt% of C, 4 to 8 weight% Si and 1 to 5 weight% of Fe on the basis of taking the total weight of the steel making final slag adjustment agent as a reference. When the steel making final slag adjustment agent is used, molten steel temperature drop is small, the steel making final slag adjustment agent is used after blowing of converter steelmaking is completed and before steel tapping, and the steel making final slag adjustment agent can reduce the content of TFe in final slag, and can reduce the production cost.

Description

technical field [0001] The invention relates to a final slag regulator for steelmaking, a preparation method and a use method thereof. Background technique [0002] At present, the proportion of high-grade steel smelting represented by weathering steel and ultra-low carbon steel (IF steel) in steel mills is gradually increasing, and the deep blowing at the end of converter smelting is serious, and the content of TFe (full iron) in the final slag is generally as high as 25%. The high content of TFe in slag, on the one hand, seriously affects the effect of slag splashing on the converter, and on the other hand, increases the consumption of steel raw materials in steel mills. At present, it is generally shaken to "zero position" at the end of the converter tapping, and a magnesium-containing carbonaceous material modifier is added when the slag is splashed to reduce the TFe content of the final slag of the converter and increase the melting point and viscosity of the slag, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36
Inventor 曾建华梁新腾陈永李扬洲杨森祥陈均陈路龚洪君喻林
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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