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Method for preparing composite ceramic graphite electrode

A technology of graphite electrodes and composite ceramics, which is applied in the field of preparation of composite ceramic graphite electrodes, can solve the problems of low energy efficiency, easy loss, and the electrodes do not have anti-oxidation performance, and achieves dense electrode structure, high emission performance, and excellent anti-oxidation performance. Effect

Active Publication Date: 2014-10-29
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrodes prepared above do not have anti-oxidation properties, are prone to wear and tear, and have low energy efficiency.

Method used

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  • Method for preparing composite ceramic graphite electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of composite ceramic graphite electrode is characterized in that comprising the steps of following order:

[0022] (1) Hot-pressed graphite rod:

[0023] ① Raw material selection: choose petroleum tar, needle coke, anthracite and coal tar pitch as raw materials, the selected quality standard is: the quality index of petroleum coke is, specific resistance Ω 2 / m, the specific gravity is 1.8g / m 3 , ash content ≤ 1.0%; the quality index of needle coke is: specific resistance Ω 2 / m, the specific gravity is 2.0g / m 3 , ash content ≤ 1.1%; the quality index of anthracite is: specific resistance Ω 2 / m, the specific gravity is 0.7g / m 3 , ash content ≤ 12.0%; the selected proportions are: 30% petroleum coke, 40% needle coke, 25% anthracite, and 5% coal tar pitch.

[0024] ②Calcination: The selected material is calcined under the condition of isolation of air, and the calcining temperature is 1300°C.

[0025] ③Batching: crush the selected material...

Embodiment 2

[0034] A kind of preparation method of composite ceramic graphite electrode is characterized in that comprising the steps of following order:

[0035] (1) Hot-pressed graphite rod:

[0036] ① Raw material selection: choose petroleum tar, needle coke, anthracite and coal tar pitch as raw materials, the selected quality standard is: the quality index of petroleum coke is, specific resistance Ω 2 / m, the specific gravity is 2.2g / m 3 , ash content ≤ 1.0%; the quality index of needle coke is: specific resistance Ω 2 / m, the specific gravity is 2.3g / m 3 , ash content ≤ 1.1%; the quality index of anthracite is: specific resistance Ω 2 / m, the specific gravity is 0.9g / m 3 , ash content ≤ 12.0%; selected ratios are: 30% petroleum coke, 30% needle coke, 30% anthracite, 10% coal tar pitch.

[0037] ②Calcination: The selected materials are calcined under the condition of isolation of air, and the calcining temperature is 1500°C.

[0038] ③Batching: crush the selected materials after ca...

Embodiment 3

[0046] A kind of preparation method of composite ceramic graphite electrode is characterized in that comprising the steps of following order:

[0047] (1) Hot-pressed graphite rod:

[0048] ① Raw material selection: choose petroleum tar, needle coke, anthracite and coal tar pitch as raw materials, the selected quality standard is: the quality index of petroleum coke is, specific resistance Ω 2 / m, the specific gravity is 2.0g / m 3 , ash content ≤ 1.0%; the quality index of needle coke is: specific resistance Ω 2 / m, the specific gravity is 2.1g / m 3 , ash content ≤ 1.1%; the quality index of anthracite is: specific resistance Ω 2 / m, the specific gravity is 0.8g / m 3 , ash content ≤ 12.0%; the selected proportions are: 50% petroleum coke, 40% needle coke, 5% anthracite, and 5% coal tar pitch.

[0049] ②Calcination: The selected material is calcined under the condition of isolation of air, and the calcining temperature is 1400°C.

[0050] ③Batching: crush the selected materials...

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Abstract

The invention relates to a method for preparing a composite ceramic graphite electrode. The method is characterized by comprising the following steps: (1) carrying out hot-pressing on a graphite rod: calcining, blending, kneading, pressing, baking and graphitizing petroleum coke, needle-shaped coke and anthracite serving as raw materials, wherein coal pitch is taken as a binder; (2) depositing a silicon carbide nanometer layer by virtue of a chemical vapor deposition method; and (3) depositing a hafnium carbide nanometer layer by virtue of a chemical vapor deposition method. The method has the advantages of mature shaping process and simple device; the composite ceramic graphite electrode has the advantages of compact structure, excellent oxidation resistance and high emission properties; an anti-oxidative layer on the surface of the composite ceramic graphite electrode and an electrode substrate are bonded by virtue of chemical bonds, the bonding force is strong and the anti-oxidative layer does not easily fall off.

Description

technical field [0001] The invention relates to a preparation method of a graphite electrode, in particular to a preparation method of a composite ceramic graphite electrode. Background technique [0002] Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as a binder, and a high-temperature-resistant graphite conductive material made by calcination of raw materials, batching, kneading, pressing, roasting, graphitization and mechanical processing. , has good high temperature performance, low thermal expansion coefficient, strong corrosion resistance and easy processing, and is an indispensable high temperature resistant conductive material in the modern electric furnace steelmaking industry. However, in the high temperature and oxygen blowing environment of iron and steel smelting, graphite electrodes are prone to oxidation reactions with oxygen, resulting in consumption. The oxidation of graphite electrodes starts at about...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B41/87
Inventor 陈照峰聂丽丽
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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