Manufacturing method of ultra high power graphite electrode with diameter no less than 550mm

Abstract

The invention relates to a manufacturing method of ultra high power graphite electrode with diameter not less than 550mm, which comprises the following steps: blending raw materials, wherein the raw materials in weight percentage are as follows: 60 to 69 percent of needle coke, 20 to 30 percent of conditioning asphalt, and the balance being ultra high power electrode cut, and the granulometric composition of the blended materials in weight percentage are as follows: 11 to 15 percent of 8 to 20mm, 15 to 21 percent of 4 to 7mm, and the balance being 0.15 to 0.075mm; heating and mixing prepared dry materials, causing the dry materials heated to 125 DEG C within 20 minutes, adding the conditioning asphalt bond to knead, causing temperature of paste to be 150 to 160 DEG C within 40 minutes, taking the paste out of a furnace to cool; cooling the paste to be 120 to 130 DEG C, prepressing the paste in a press of 2,500 tons in vacuum, and extruding the paste after the prepressing; and roasting, dipping, twice roasting, graphitizing and machining the extruded blank to final finished products. The method improves technical formula, and adopts the oil press of 2,500 tons to produce the ultra high power graphite electrode according with quality requirements of steel making and yellow phosphorus production.

Description

technical field [0001] The invention relates to a method for manufacturing a graphite electrode, in particular to a method for producing an ultra-high-power graphite electrode with a diameter of 550 mm and above by using a 2,500-ton hydraulic press. Background technique [0002] In my country, Φ550mm and above ultra-high power graphite electrodes mainly rely on imports. Because the production of Φ550mm and above ultra-high power graphite electrodes is restricted by raw materials, equipment and process technology, there are few manufacturers and quantities that can be produced in China. At present, the industry produces Φ550mm Ultra-high-power graphite electrodes with large specifications and above require more than 3,500 tons of hydraulic presses, and the equipment investment is large. The existing press is 2,500 tons. According to traditional experience, the 2,500-ton press has a small compression ratio and low pressure. It is difficult to solve the product structure and den...

AI Technical Summary

Problems solved by technology

[0002] In my country, Φ550mm and above ultra-high power graphite electrodes mainly rely on imports. Because the production of Φ550mm and above ultra-high power graphite electrodes is restricted by raw materials, equipment and process technology, there are few manufacturers and quantities that can be produced in China. At present, the industry produces Φ550mm Ultra-high-power graphite electrodes with large specifications and above require more than 3,500 tons of hydraulic presses, and the equipment investment is large

The existing press is 2,500 tons. According to traditional experience, the 2,500-ton press has a small compression ratio and low pressure. It is difficult to solve the problem of product structure and density in the production of high-quality ultra-high-power graphite electrodes of Φ550mm and above.