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Preparation method of graphite electrode for electric-arc furnace

A graphite electrode and electric arc furnace technology, applied in the field of improved electric arc furnace graphite electrode preparation, graphite electrode preparation, can solve the problems of graphite electrode short service life, large oxidation loss, limited inhibition, etc., to reduce the occurrence of fracture accidents, Improve cohesion and anti-oxidation effect

Inactive Publication Date: 2019-01-18
SICHUAN LIZHI JIUCHUANG INTPROP OPERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, whether it is a conductive additive or an increase in processing and molding pressure, the inhibitory effect on reducing the oxidation loss of graphite electrodes is very limited. The optimized and improved graphite electrode still has the problem of large oxidation loss in the actual application process, and the service life of graphite electrodes is not long.

Method used

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  • Preparation method of graphite electrode for electric-arc furnace
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Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing an electric arc furnace graphite electrode, comprising the following steps:

[0029] (1) Take 57% of petroleum coke particles, 5% of aluminum oxide powder, 3% of calcium oxide, 15% of graphite powder particles, and 20% of asphalt by weight percentage.

[0030] (2) First introduce petroleum coke particles, alumina powder, calcium oxide, and graphite powder particles into the kneading pot, and simultaneously raise the temperature to 122°C, and knead for 30 minutes;

[0031] (3) Heat the asphalt to 160°C to melt, add it to the kneading pot in step 2, control the temperature of the kneading pot to 155°C, and then keep kneading for 20 minutes.

[0032] (4) After the kneading in step 3 is completed, the material is introduced into a forming mold, pressurized to 20 MPa, and kept under pressure for 20 minutes to obtain a blank to be roasted.

[0033] (5) The blank to be roasted was heated to 500°C at a heating rate of 10°C / min under a nitrogen protective...

Embodiment 2

[0036] A method for preparing an electric arc furnace graphite electrode, comprising the following steps:

[0037] (1) Take 54% of petroleum coke particles, 4% of aluminum oxide powder, 2% of calcium oxide, 15% of graphite powder particles, and 25% of asphalt by weight percentage.

[0038] (2) First introduce petroleum coke particles and graphite powder particles into the kneading pot, add alumina powder and 1 / 3 of the total amount of calcium oxide, heat up to 122°C, knead for 5 minutes, add alumina powder, calcium oxide total 1 / 3 of the amount, knead for 5 minutes, add the remaining alumina powder and calcium oxide, and continue kneading for 20 minutes;

[0039] (3) Heat the asphalt to 160°C to melt, add it to the kneading pot in step 2, control the temperature of the kneading pot to 155°C, and then keep kneading for 20 minutes.

[0040] (4) After the kneading in step 3 is completed, the material is introduced into a forming mold, pressurized to 20 MPa, and kept under pressu...

Embodiment 3

[0044] A method for preparing an electric arc furnace graphite electrode, comprising the following steps:

[0045] (1) Take 60% of petroleum coke particles, 3% of aluminum oxide powder, 3% of calcium oxide, 10% of graphite powder particles, and 24% of asphalt by weight percentage.

[0046] (2) First introduce petroleum coke particles and graphite powder particles into the kneading pot, add alumina powder and 1 / 3 of the total amount of calcium oxide, heat up to 122°C, knead for 5 minutes, add alumina powder, calcium oxide total 1 / 3 of the amount, knead for 5 minutes, add the remaining alumina powder and calcium oxide, and continue kneading for 20 minutes;

[0047] (3) Heat the asphalt to 170°C to melt, keep it warm for 10 minutes, then add the asphalt to the kneading pot in step 2, control the temperature of the kneading pot to rise to 155°C, and then keep warm and knead for 20 minutes.

[0048] (4) After the kneading in step 3 is completed, the material is introduced into a f...

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Abstract

The invention discloses a preparation method of a graphite electrode for an electric-arc furnace. The preparation method comprises the following steps: (1) preparing 50%-60% of petroleum coke particles, 3%-6% of aluminum trioxide powder, 2%-4% of calcium oxide, 10%-20% of graphite powder particles and 15%-25% of asphalt; (2) pouring the raw materials into a mixing-kneading pot, heating, and carrying mixing and kneading; (3) heating the asphalt to 150-180 DEG C until the asphalt is melted, adding the asphalt into the mixing-kneading pot, heating, and carrying mixing and kneading; (4) introducing the materials into a forming mold, carrying out pressurization, so as to obtain a to-be-roasted blank; (5) heating to 500-550 DEG C in a nitrogen atmosphere, maintaining the temperature, further heating to 880-920 DEG C, and roasting, so as to obtain a green body; and (6) heating to 2300-2400 DEG C for 24-72 hours in a high-temperature electric furnace, and maintaining the temperature for 24-72hours, so as to prepare the graphite electrode. The graphite electrode is good in oxidation resistance and strong in cohesion force, so that the problem of a breakage accident in the use process of the graphite electrode is well controlled.

Description

technical field [0001] The invention relates to a preparation method of a graphite electrode, in particular to an improved preparation method of an electric arc furnace graphite electrode, and belongs to the technical field of new metallurgical materials. Background technique [0002] Electric arc furnace is a commonly used high-temperature ore smelting device in metallurgy and forging processing. During the smelting process of electric arc furnace, there are several kinds of discharge energy. The arc energy directly acts on the smelted metal, the smelting speed is fast, and the removal efficiency of sulfur, phosphorus and other impurities is high. Graphite electrodes are electrode materials processed from petroleum coke and needle coke as raw materials and coal tar pitch as a binder. During the smelting process of the electric arc furnace, the graphite electrode releases electric energy in the form of an arc to heat and smelt the charge, and the graphite electrode directly ...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/622C04B35/626H05B7/085
CPCC04B35/522C04B35/622C04B35/62605C04B2235/3208C04B2235/3217C04B2235/602C04B2235/6562C04B2235/6567H05B7/085
Inventor 张慧张羽
Owner SICHUAN LIZHI JIUCHUANG INTPROP OPERATION CO LTD
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