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Method for protecting graphite electrodes from oxidation corrosion

A graphite electrode and oxidation erosion technology, applied in the field of carbon, can solve the problems affecting the production quality of graphite electrodes, gasification cannot be dispersed and flowed out, and the air flow at the upper end of the electrode is different, so as to achieve excellent performance, prevent operation methods, and avoid corrosion.

Active Publication Date: 2015-09-23
CHENGDU CHENGXIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] In the production process of graphitization, graphite electrodes need to be carried out in a graphitization furnace (Acheson graphitization furnace or inner series graphitization furnace). In order to reduce the contact points between graphite electrodes, generally four graphite electrodes are one The group forms a circle, so that the space surrounded by the four electrodes forms a gap, and the graphite electrodes in the graphitization furnace are covered with metallurgical coke powder for heat insulation, and the metallurgical coke powder will naturally fall into the gap. Because the particle size of metallurgical coke powder is different, the general particle size is between 0-15mm. When filling the gap, the metallurgical coke powder with smaller particle size is in the lower part, and the larger particle size is in the upper part. Between them, the air flow at the upper end of the electrode is different, so that the vaporized metal oxide cannot disperse and flow out, but can only flow along the electrode. In this way, reptile-like metal oxides will appear on the surface of the electrode over time, which will corrode the graphite electrode, which not only affects The production quality of the graphite electrode itself, but also reduces its service life in the future

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0026] Metallurgical coke powder is used to fill the gap between the electrode and the electrode. The specific performance indicators of the metallurgical coke powder used are as follows: the mass percentage of volatile matter is below 1.5%; the mass percentage of ash content is below 8%; the mass percentage of fixed carbon content More than 85%; the mass percentage of sulfur content is less than 0.6%, and the mass percentage of water content is less than 10%;

[0027]The particle size mass distribution ratio of the metallurgical coke powder filled around the graphite electrode is mainly as follows: 0-0.5mm accounts for 30%, 12-15mm accounts for 10%, and 0.5-12mm accounts for 60%. The specific particle size of the coke powder is shown in Table 1 below:

[0028] Table 1 The particle size of the metallurgical coke powder of each embodiment

[0029] group

[0030] Example 3

Embodiment 6-10

[0032] Metallurgical coke powder is used to fill the gap between the electrode and the electrode. The specific performance indicators of the metallurgical coke powder used are as follows: the mass percentage of volatile matter is below 1.5%; the mass percentage of ash content is below 8%; the mass percentage of fixed carbon content More than 85%; the mass percentage of sulfur content is less than 0.6%, and the mass percentage of water content is less than 10%;

[0033] The particle size mass distribution ratio of the metallurgical coke powder filled around the graphite electrode is mainly as follows: 0-0.5mm accounts for 40%, 12-15mm accounts for 8%, and 0.5-12mm accounts for 52%. The specific particle size of the coke powder is shown in Table 2 below:

[0034] Table 2 The particle size of the metallurgical coke powder of each embodiment

[0035] group

Embodiment 11-15

[0037] Metallurgical coke powder is used to fill the gap between the electrode and the electrode. The specific performance indicators of the metallurgical coke powder used are as follows: the mass percentage of volatile matter is below 1.5%; the mass percentage of ash content is below 8%; the mass percentage of fixed carbon content More than 85%; the mass percentage of sulfur content is less than 0.6%, and the mass percentage of water content is less than 10%;

[0038] The particle size mass distribution ratio of the metallurgical coke powder filled around the graphite electrode is mainly as follows: 0-0.5mm accounts for 35%, 12-15mm accounts for 5%, and 0.5-12mm accounts for 60%. The specific particle size of the coke powder is shown in Table 3 below:

[0039] Table 3 The particle size of the metallurgical coke powder of each embodiment

[0040] group

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Abstract

The invention provides a method for protecting graphite electrodes from oxidation corrosion. The method comprises the following steps: (A), first, filling the intervals among the graphite electrodes with metallurgical coke powder with a granularity of 3-12 mm; (B) then, filling the peripheries of the graphite electrodes with coke powder with a granularity of 0-15 mm. The method has the effects of protecting the graphite electrodes from corrosion, and prolonging the service lives of the graphite electrodes.

Description

technical field [0001] The invention relates to the field of carbon, in particular to a method for preventing oxidation corrosion of graphite electrodes. Background technique [0002] In recent years, the carbon industry has developed vigorously, and its main materials, carbon and graphite, are non-metallic solid materials dominated by carbon elements, among which carbon materials are basically composed of non-graphitic carbon, while graphite materials are basically composed of A material composed of graphitic carbon. It has the characteristics of light weight, porosity, electrical conductivity, thermal conductivity, corrosion resistance, lubricity, high temperature strength, heat resistance, thermal shock resistance, low thermal expansion, low elasticity, high purity, and processability. [0003] Carbon products can be divided into graphite electrodes, carbon blocks, graphite anodes, carbon electrodes, pastes, electric carbons, carbon fibers, special graphites, graphite he...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 周尚银张攀宁忠平
Owner CHENGDU CHENGXIN TECH CO LTD
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