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Making a CHIX Graphite Electrode
1, Mill, Mix & Forming
Premium quality calcined coke is crushed, screened, and hot-blended with pitch in controlled proportions. The resulting plastic mass is extruded through a forming press and cut into specified lengths before being water-cooled in a temperature controlled bath.
2, Baking
Green electrodes are placed in large cans called saggers (pronounced say gers) and baked to over 800¡ã C (1400¡ã F) in specially designed, computer-controlled furnaces. It takes 1-to-2 weeks to carbonize the pitch depending upon the size of the electrodes being made. After cooling, the carbon electrodes are cleaned, inspected, and sample-tested.
3, Impregnation
Next, the baked electrodes are impregnated with a special pitch to give them the higher density, mechanical strength, and electrical conductivity they will need to withstand the severe operating conditions inside our customers¡¯ electric arc furnaces.
4, Rebake
A second baking cycle, or ¡°rebake,¡± is required to carbonize the pitch impregnation and to drive off any remaining volatiles. Rebake temperatures reach almost 750℃ (1300¡ã F).
5, Graphitizing
The rebaked carbon electrodes are further processed in long electric resistance furnaces. Laid end-to-end, or ¡°longitudinally,¡± the electrodes are heated to over 3000¡ã C (5000¡ã F). This ultra high temperature restructures the carbon to its crystalline form¡ªgraphite. Then the electrodes are once again cooled, cleaned, inspected, and sample-tested under GrafTech¡¯s rigorous control procedures.
6, Machining
In Machining, the electrodes outer dimension are turned to its finished dimension. The two end faces are also machined to tolerance and given threaded sockets. The sockets accept GrafTech¡¯s double-tapered, machine-threaded graphite connecting pins which allow our customers to join electrodes together into columns.
7, Shipping
After machining, the finished graphite electrodes are inspected, protectively capped and palletized. |
| Company: |
Hebei Jinbang Carbon Products Co.Ltd
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| Contact: |
Ms. Dragon Y |
| Address: |
Willow bridge street |
| Postcode: |
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| Tel: |
15830077751 |
| Fax: |
0310-5502268 |
| E-mail: |
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