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Converter refined slaging medium and slagging technique

A slagging agent, converter steelmaking technology, applied in the manufacture of converters, etc., can solve the problems of consumption, ladle erosion, high oxidation, etc., to achieve the effect of absorbing more inclusions, good refining effect, and reduced oxidation

Inactive Publication Date: 2008-07-30
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the converter is tapped, a part of the final slag of the converter will enter the ladle. After deoxidation and alloying, the slag in the ladle will be low in alkalinity and highly oxidizable, which will corrode the ladle and consume too much Refractory materials, increasing production costs
In addition, the existing refining slagging agent is only added during the refining process of the LF furnace, and is not classified according to the steel type, so that the formation of white slag is slow, and the refining effect of the LF furnace cannot be fully utilized.

Method used

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  • Converter refined slaging medium and slagging technique

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Embodiment 1

[0047] Provide the specific embodiment of the present invention on the low-carbon steel grade of Kunming Iron and Steel Plant below.

[0048] The chemical composition of raw materials used is shown in Table 1:

[0049]

[0050] 1. Grind the above-mentioned raw materials to 5-15mm, so that the particle size less than 5mm does not exceed 10% of the total amount, heat and bake until the water content is less than 0.5%, and mix well after mixing as required, so that it is evenly mixed. stand-by;

[0051] 2. During the tapping process of the converter, a synthetic slagging agent composed of the following raw materials is added by weight percentage:

[0052] Dolomite 7%, Bauxite 12%,

[0053] Lime 79%, Crude Aluminum 2%,

[0054] The composition of its synthetic slagging agent is as follows:

[0055] CaO 74.29%, SiO 2 4.62%,

[0056] MgO 2.83%, Al 2 o 3 13.65%,

[0057] Al 4.56%, S 0.05%;

[0058] 3. During the refining process of the LF furnace, a low-carbon...

Embodiment 2

[0073] The specific embodiment of the present invention on medium and high carbon steel grades of Kunming Iron and Steel Co., Ltd. is given below.

[0074] The raw material composition is shown in Table 1. Raw material preparation is identical with embodiment 1.

[0075]1. During the tapping process of the converter, a synthetic slagging agent composed of the following raw materials is added by weight percentage:

[0076] Dolomite 8%, Bauxite 13%,

[0077] Lime 75%, Crude Aluminum 4%,

[0078] The composition of this synthetic slagging agent is as follows:

[0079] CaO 70.89%, SiO 2 6.62%,

[0080] MgO 2.98%, Al 2 o 3 10.79%,

[0081] Al 5.96%, S 0.06%;

[0082] 2. During the refining process of the LF furnace, a medium-high carbon submerged arc slagging agent composed of the following raw materials is added by weight percentage:

[0083] Limestone 20%, Dolomite 15%,

[0084] Lime 41%, Bauxite 10%,

[0085] Calcium carbide 10%, coke 4%,

[0086] The com...

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Abstract

A slag-forming agent is prepared from dolomite, bauxite, lime and crude aluminium for refining molten steel in converter, or from lime stone, dolomite, lime, bauxite and crude aluminium for refining molten steel in LF furnace. Its advantages are lower oxidizing performance, high basicity, proper surface tension, viscosity and foaming power, and low corrosion. Its slag-forming process is also disclosed.

Description

technical field [0001] The invention relates to a steelmaking process, in particular to a slagging agent and a slagging process in the steelmaking refining process. Background technique [0002] At present, the steelmaking process is mainly LD converter steelmaking, LF refining furnace steelmaking, continuous casting machine steel pouring, plus some enhanced smelting methods, such as molten iron hot charging, scrap steel heating, oxygen burner fluxing, etc., to further shorten the The oxidation and refining time of molten steel is shortened, and the billet forming speed of molten steel is also accelerated. After the converter is tapped, a part of the final slag of the converter will enter the ladle. After deoxidation and alloying, the slag in the ladle will be low in alkalinity and high in oxidation, which will corrode the ladle and consume too much Refractory materials increase production costs. In addition, the existing refining slagging agents are only added during the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36C21C7/04
Inventor 陈光碧李金柱王远苏鹤洲徐楚韶张卫强
Owner WUKUN STEEL
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