Graphite Electrode Manufacturing Flow

By:Yvonne Jan 25, 2021
Simple talk about graphite electrode manufacturing process flow.
The graphite electrode manufacturing process includes the following main processes.
● Screening and mixing of raw materials (green or raw petroleum coke) and blending with coal tar pitch to form a dense paste.
● Formation or extrusion of the electrode.
The paste was passed through a proprietary extruder mixer to form elongated rods of uniform diameter.
● Calcining or Baking of the electrode to decompose and devolatilize (purify) the petroleum needle coke by removing organic materials, moisture and volatile combustible matter, thereby increasing the fixed carbon content, electrical conductivity and real/true density in the resultant calcined petroleum coke (“CPC”).
● First Pitch Impregnation (“1PI”) which consists of impregnating/soaking the electrode with tar pitch binder to reduce porosity or void fractions within the graphite rod to improve strength.
Following calcination, the graphite rods were soaked in a solution of tar pitch for 1 hour.
● Re-Calcining or Re-Baking — this step is to ensure that all voids within the rods are filled with pitch coke binder.
● Second Pitch Impregnation (“2PI”) — to ensure that all gaps within the rods are filled with pitch coke binder.
● Graphitization — removes additional impurities and improves the electrodes’ key qualities: thermal and electrical conductivity, thermal shock resistance performance, lubricity, and abrasion resistance.
● Machining to create the exact sizes and smooth surface.
Complete graphite electrode manufacturing process flow chart:
 graphite electrode manufacturing process flow chart:
Graphite electrodes equipment:
Petroleum coke, needle coke (raw material)
Petroleum coke, needle coke (raw material)

Rotary kiln structural drawing
Rotary kiln structural drawing

Retortc alciner structural drawing
Retortc alciner structural drawing

Double roll crusher
Double roll crusher

Raymond mill
Raymond mill

Multi layer vibrating screen
Multi layer vibrating screen

3500t vertical ramming horizontal pressure electrode extrusion machines
3500t vertical ramming horizontal pressure electrode extrusion machines

Acheson furnace
Acheson furnace

CNC lines for electrode and nipple machining
CNC lines for electrode and nipple machining
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