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Submerged arc refining slag for square billet LF refining and production process and equipment thereof

A production equipment and refining slag technology, applied in the field of metallurgy, can solve problems such as unstable current transmission, high power consumption, and graphite electrode breakage

Active Publication Date: 2021-09-10
江苏润美新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the sharp increase in the recycling of scrap iron and steel materials, especially rebar used in construction, it is the future development trend to recycle waste rebar to smelt silicon-manganese steel; and in order to reduce production costs, some steel companies have adopted the addition of scrap steel during the billet LF refining process. Post-refining process, although this process can reduce the cost per ton of steel, it will lead to increased graphite electrode fractures and unstable current transmission during the LF refining process, resulting in high power consumption and long refining time. The electric arc generated between the steel scraps causes the service life of the ladle to drop sharply, and the noise pollution in the production process is serious;
[0003] In the LF refining process of billet, some experts and scholars have done a lot of research and application on refining submerged arc foaming, but they are only implemented for the ordinary refining process without adding scrap steel, while in the billet LF refining process For the time being, there is no relevant report on the submerged arc adding scrap steel

Method used

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  • Submerged arc refining slag for square billet LF refining and production process and equipment thereof
  • Submerged arc refining slag for square billet LF refining and production process and equipment thereof
  • Submerged arc refining slag for square billet LF refining and production process and equipment thereof

Examples

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Effect test

Embodiment 1

[0045] refer to figure 1 , a kind of submerged arc refining slag for billet LF refining, its raw material weight percentage composition is: CaCO 3 50% parts, MgO 20% parts, SiO 2 5% parts, BaCO 3 10%, Na 2 CO 3 5% for SiC, 5% for CaF 2 5% portion;

[0046] CaCO 3 Can be synthetic or natural limestone; BaCO 3 Can be commercially available or waste containing barium; Na 2 CO 3 It is industrial soda ash; MgO can be any one of magnesia, light burnt magnesia, magnesia dolomite or magnesite; SiC can be any one of industrial smelting grade silicon carbide or silicon carbide-containing waste; SiO2 can be silica , any one of quartz sand or bentonite.

[0047] The present invention is mainly used for the submerged arc of the billet in the LF refining process, using carbonate (CaCO 3 、BaCO 3 、Na 2 CO 3 , MgCO 3 ) etc. as the main raw materials, carbonates decompose due to high temperature after entering the molten steel, producing a large amount of CO 2 Bubbles, SiC, C, C...

Embodiment 2

[0054] refer to figure 1 , as another preferred embodiment of the present invention, the difference with embodiment 1 is that its raw material weight percent composition is: CaCO 3 65% parts, MgO 10% parts, SiO 2 5% parts, BaCO 3 10%, Na 2 CO 3 3% for SiC, 3% for CaF 2 for 4% parts;

[0055] CaCO 3 Can be synthetic or natural limestone; BaCO 3 Can be commercially available or waste containing barium; Na 2 CO 3 It is industrial soda ash; MgO can be any one of magnesia, light burnt magnesia, magnesia dolomite or magnesite; SiC can be any one of industrial smelting grade silicon carbide or silicon carbide-containing waste; SiO2 can be silica , any one of quartz sand or bentonite.

[0056] The present invention is mainly used for the submerged arc of the billet in the LF refining process, using carbonate (CaCO 3 、BaCO 3 、Na 2 CO 3 , MgCO 3 ) etc. as the main raw materials, carbonates decompose due to high temperature after entering the molten steel, producing a larg...

Embodiment 3

[0063] In the process of preparing synthetic slag, it is necessary to mix and stir the materials. The stirring shaft in the fixed position of the mixer in the prior art rotates and stirs, which cannot make the materials evenly mixed, and the stirring effect is not ideal; When removing slag, two pressure rollers are generally used to squeeze the material, so that the contact range between the material and the pressure roller is limited, and the material cannot be ball-pressed to the greatest extent;

[0064] refer to Figure 2-11 , a submerged arc refining slag production equipment for billet LF refining, including a mounting frame 1, a mixing mechanism 2, a ball pressing mechanism 3 and a driving mechanism 4, the mixing mechanism 2 is installed on the top of the mounting frame 1, and the ball pressing mechanism 3 Installed at the outlet end of the mixing mechanism 2, the drive mechanism 4 is installed outside the ball pressing mechanism 3;

[0065] Mixing mechanism 2 comprise...

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Abstract

The invention relates to the technical field of metallurgy, in particular to submerged arc refining slag for square billet LF (ladle furnace) refining. The submerged arc refining slag comprises the following raw materials in percentage by weight: 40 to 65 percent of CaCO3, 0 to 20 percent of MgO, 5 to 10 percent of SiO2, 0 to 20 percent of BaCO3, 0 to 10 percent of Na2CO3, 0 to 15 percent of SiC and 0 to 15 percent of CaF2. The method is mainly used for submerged arc of square billets in the LF refining process; carbonates (CaCO3, BaCO3, Na2CO3, MgCO3) and the like are used as main raw materials; the carbonates are decomposed due to high temperature after entering molten steel; a large number of CO2 bubbles are generated; meanwhile, brought-in SiC, C, CaC2 and the like react with CO2 to generate CO; a large number of bubbles are obtained; and the purpose of submerged arc is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a submerged arc refining slag for billet LF refining and its production process and equipment. Background technique [0002] With the sharp increase in the recycling of scrap iron and steel materials, especially rebar used in construction, recycling waste rebar to smelt silicomanganese steel is the future development trend; and in order to reduce production costs, some steel companies have adopted the addition of scrap steel during the billet LF refining process. Post-refining process, although this process can reduce the cost per ton of steel, it will lead to increased graphite electrode fractures and unstable current transmission during the LF refining process, resulting in high power consumption and long refining time. The electric arc generated between the steel scraps causes the service life of the ladle to drop sharply, and the noise pollution in the production process i...

Claims

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Application Information

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IPC IPC(8): C21C7/076B07B1/28B07B1/42B01J2/22
CPCC21C7/076B07B1/28B07B1/42B01J2/22Y02P10/20
Inventor 邓勇跃江尧华朱建强陈卫忠
Owner 江苏润美新材料有限公司
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