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Method for Graphitization by Using Roasting Crushed as Resistive Filling in Acheson Type Graphitization Furnace

A graphitization furnace and resistance material technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as affecting the quality of graphitized products, increasing cracks in graphitized products, and increasing production costs, so as to improve product additional value, good compactness, and the effect of reducing cracks

Active Publication Date: 2021-08-06
山西能源学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, in production, as the effective resistance of the furnace core increases, the power factor of the graphitization furnace equipment also increases, which is more conducive to improving the productivity of the furnace and reducing power consumption. However, traditional metallurgical coke, graphitized coke and Resistance materials such as mixed coke (especially metallurgical coke) have disadvantages such as high ash content, high sulfur content, low true density, high specific resistance and large burning loss (about 30~40%) under high temperature conditions. Technical problems require continuous feeding, which not only increases the production cost, but also limits the improvement of the effective resistance of the furnace core
In addition, these resistance materials generally have a large resistance difference between the resistivity and the resistance material of the graphitized product, which leads to an excessive temperature difference between various parts of the furnace core and increases the cracks of the graphitized product, which greatly affects the graphitized product. quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Mix the resistance material and the product to be baked in a graphitization furnace, and then bake it at a temperature of 3000-3200°C for 90 hours. The resistance material has an ash content of 0.5%, a volatile content of 1.0%, and a sulfur content of 0.5%. , the moisture content is 1.2%, the particle size is 10-20mm, and the specific resistance is 400-500μΏm roasted powder.

[0014] The purity of the graphite crushed product obtained after roasting is 98%, the ash content is 0.28%, the sulfur content is 0.025%, the bulk density is 2.25g / cm³, and the powder specific resistance is 98µΏm.

Embodiment 2

[0016] Mix the resistance material and the product to be baked in a graphitization furnace, and then bake it at a temperature of 3000-3200°C for 110 hours. The resistance material has an ash content of 0.4%, a volatile content of 0.8%, and a sulfur content of 0.4%. , the moisture is 0.9%, the particle size is 15-20mm, and the specific resistance is 400-500μΏm roasted crushed.

[0017] The purity of the graphite crushed product obtained after roasting is 99%, the ash content is 0.23%, the sulfur content is 0.023%, the bulk density is 2.40g / cm³, and the powder specific resistance is 98µΏm.

Embodiment 3

[0019] Mix the resistance material and the product to be baked in a graphitization furnace, and then bake it at a temperature of 3000-3200°C for 115 hours. The resistance material has an ash content of 0.5%, a volatile content of 1.0%, and a sulfur content of 0.3%. , the moisture is 0.8%, the particle size is 10-20mm, and the specific resistance is 400-500μΏm roasted crushed.

[0020] The purity of the graphite crushed product obtained after roasting is 99%, the ash content is 0.25%, the sulfur content is 0.027%, the bulk density is 2.22g / cm³, and the powder specific resistance is 97µΏm.

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Abstract

The invention discloses a resistance material used in an Acheson type graphitization furnace, which is characterized in that the resistance material is roasted powder, and the performance index of the roasted powder is: ash content below 0.5%, volatile content below 1% , the sulfur content is below 0.5%, the moisture content is 0.6-1.2%, the particle size is 10-30mm, and the specific resistance is 400-500µΏm. The present invention also discloses the graphitization of resistance filler in Acheson type graphitization furnace by using roasted crushed material as resistance material, which can be used as regenerated graphite material, additive material for making anode material or carburizing agent for electric furnace steelmaking process. Method for crushed graphite products. The implementation of the method of the invention can not only improve the production efficiency and product quality of graphite product enterprises, but also increase the added value of roasting and crushing.

Description

technical field [0001] The invention belongs to the technical field of carbon material production, and in particular relates to a resistance material used in an Acheson-type graphitization furnace, and a method for preparing crushed graphite products from the resistance material in an Acheson-type graphitization furnace, as well as a crushed graphite product Applications. Background technique [0002] When the Acheson type graphitization furnace is installed, the space between the electrode rows of the furnace is filled with granular carbon materials. This material is called resistance material. Its main function is to increase the effective resistance of the furnace core and ensure the uniformity of the graphitized products. For heating, its quantity accounts for about 20% of the volume of the furnace core. The electric heating process in the furnace core is mainly carried out in the resistance material. The resistance material should have a high resistivity in order to in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205
CPCC01P2006/10C01P2006/40C01P2006/80C01B32/205
Inventor 王晓琴张莹王海堂苏立红武江红
Owner 山西能源学院