Bottom electrode of DC arc furnace

A DC electric arc furnace and bottom electrode technology, applied in the field of electric arc furnaces, can solve the problems of shortening the service life of the DC electric arc furnace, falling off or thinning of refractory materials, damage of the bottom electrode, etc. The effect of conductivity

Inactive Publication Date: 2015-10-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, no matter whether the DC electric arc furnace is used for steelmaking, ironmaking or titanium slag smelting, the reaction temperature is at least above 1500°C. The refractory materials that work for a long time under this temperature condition are extremely easy to be corroded and fall off or become thinner. In particular, the corrosion of the furnace bottom refractory material is more serious. At this time, once the molten steel or slag touches the anode conductive metal rod at the furnace bottom, it is easy to melt it and even burn through the furnace bottom, causing the bottom electrode to be damaged. Destruction, shortening the service life of the entire DC arc furnace

Method used

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  • Bottom electrode of DC arc furnace

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Effect test

Embodiment 1

[0025] Embodiment 1: the bottom electrode of DC electric arc furnace comprises a conductive metal rod 2 with a diameter of 50mm and a length of 260mm, and the length, width and thickness of the graphite protective sleeve 3 processed accordingly are 80mm, 80mm, and 150mm respectively, and the conductive metal rod on it is 2 The depth of the blind hole is 70mm, the graphite protective sleeve 3 has a carbon mass fraction of 80%, the furnace bottom refractory material 1 is composed of magnesia and carbon powder, the ratio is 2.5:1, the height after ramming is 350mm, and the magnesium The carbon brick layer 4 has a thickness of 50 mm, and forms the bottom electrode of the DC electric arc furnace after 3 days of curing in the oven. Compared with the bottom electrode of the existing DC electric arc furnace, the service life is increased by about 20%, and the conductivity of the bottom electrode is improved by about 12%.

Embodiment 2

[0026] Embodiment 2: the bottom electrode of DC electric arc furnace comprises a conductive metal rod 2 with a diameter of 50 mm and a length of 260 mm. The length, width and thickness of the graphite protective sleeve 3 processed accordingly are respectively 80 mm, 80 mm and 150 mm. The conductive metal rod on it 2 The depth of the blind hole is 70mm, the graphite protective sleeve 3 has a carbon mass fraction of 90%, the furnace bottom refractory material 1 is composed of magnesia and carbon powder, the ratio is 2.5:1, and the height after ramming is 350mm. The carbon brick layer 4 has a thickness of 50 mm, and forms the bottom electrode of the DC electric arc furnace after 3 days of curing in the oven. Compared with Example 1, the conductivity of the bottom electrode is improved by about 5%, and the service life is the same.

Embodiment 3

[0027] Embodiment 3: the bottom electrode of DC electric arc furnace comprises a conductive metal rod 2 with a diameter of 50mm and a length of 260mm, and the length, width and thickness of the graphite protective sleeve 3 processed accordingly are 80mm, 80mm, and 150mm respectively, and the conductive metal rod on it is 2 The depth of the blind hole is 70mm, the graphite protective sleeve 3 has a carbon mass fraction of 90%, the furnace bottom refractory material 1 is composed of magnesia and carbon powder, the ratio is 3:1, and the height after ramming is 350mm. The carbon brick layer 4 has a thickness of 50 mm, and forms the bottom electrode of the DC electric arc furnace after 3 days of curing in the oven. Compared with Example 1, the service life of the bottom electrode is increased by about 5%, and the conductivity is decreased by 6%.

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Abstract

The invention provides a bottom electrode of a direct current arc furnace, and belongs to the field of arc furnaces. The bottom electrode of the direct current arc furnace comprises a furnace bottom fire resistant material, a graphite protection sleeve and a plurality of conductive metal rods. One face of the graphite protection sleeve is provided with blind holes with the number being larger than or equal to that of the conductive metal rods, the upper ends of the conductive metal rods are in clearance fit with the blind holes of the graphite protection sleeve, the lower ends of the conductive metal rods are inserted into the furnace bottom fire resistant material through ramming, the fire resistant material is made to cover the upper surface of the graphite protection sleeve, and the upper surface of the fire resistant material is covered with a magnesia carbon brick layer. According to the bottom electrode of the direct current arc furnace, three layers of protection are provided for the conductive metal rods, the first layer is the magnesia carbon brick layer at the upmost portion, the second layer is the furnace bottom fire resistant material containing carbon powder and magnesia, the third layer is the graphite protection sleeve, erosion resistance and high-temperature resistance of a bottom electrode structure of the direct current arc furnace to molten liquid are improved, and service life of the bottom electrode is effectively prolonged.

Description

technical field [0001] The invention relates to the field of electric arc furnaces, in particular to a bottom electrode of a DC electric arc furnace. Background technique [0002] DC electric arc furnaces are currently widely used in titanium slag smelting, alloy smelting, steelmaking and ironmaking and other fields, and their service life is mainly determined by the service life of the bottom electrode. In the existing DC electric arc furnace, conductive metal rods are arranged on the bottom of the furnace as anodes, and graphite electrodes are used as cathodes. Generally speaking, no matter whether the DC electric arc furnace is used for steelmaking, ironmaking or titanium slag smelting, the reaction temperature is at least above 1500°C. The refractory materials that work for a long time under this temperature condition are extremely easy to be corroded and fall off or become thinner. In particular, the corrosion of the furnace bottom refractory material is more serious. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B3/20
Inventor 黄家旭缪辉俊张继东李庆李凯茂肖军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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