Amritesh Industries

Popularly known as Electrode Carbon Paste ( EC Paste ) is a Soderberg Paste produced by mixing a specific fraction of CPC and Electrically Anthracite Coal (ECA) and then impregnating the same with selective Coal Tar Pitch Binder at a definite temperature
ECP is used in Submerged Arc Furnaces for production of various Ferro Alloys and Calcium Carbide.

Manufacturing Process of Electrode Carbon Paste

Electrode Carbon Paste is produced by screening the CPC and or ECA to different fractions and pulverizing and storing it separately. Immediately after this the predetermined quantities of different fractions are weighed and transferred to a Sigma Mixer, which is heated to about 150 degree Centigrade by Thermic Fluid. The required quantity of the Binder is also weighed separately and the same is added to the Mixer. The mixing is continued for a particular period known as the Mixing Cycle. At the end of the Mixing Cycle, the mixed material is dumped on the mould box for casting into blocks for shipment.

Quality and Specification

The Paste is first fed in the upper part of the electrode. As the paste move downwards in the electrode it softens and melts and takes the form of the electrode casing. The flow of the Carbon Paste is essential for proper operation of the electrode, hence it is important that the Paste flows at a reasonable temperature and fills the casing of the electrode maintaining a consistent mixture of ingredients. The Paste then gets baked into a solid mass as it moves down and becomes capable of passing the required current for the furnace charge. The plasticity is a measure of its flowability which is controlled in a mixer by adjusting the Binder content or percentage of coke fines. The lower baked part of the electrode is the final electrode product. The physical properties of the Paste are of vital importance to ensure proper electrode operation without breakages.

Typical characteristics of CPC based ECP are as follows

Green Paste

Baked Paste at 1000deg Centigrade

Volatile matter	12-13% max
Fixed Carbon	84% Max
Ash	1.0% Max
Plasticity	30-45%
Apparent Density	1.55gm/cc Min
Binder Content	22-24%

Apparent Density	1.35 gms/cc Max
Electrical Resistivity	90 Ohm- meter Max
Compressive Strength	150kg/cm2 Min
Porosity	35% Max

Typical characteristics of ECA based ECP are as follows

Green Paste

Baked Paste at 1000deg Centigrade

Volatile matter	13% max
Ash	5.5% Max
Plasticity	GradeI-45-55% GradeII-25-35% GradeIII- 30-40%
Apparent Density	1.55gm/cc Min
Dry Aggregate	78-80%
Binder Content	22-24%

Apparent Density	1.36 gms/cc Max
Electrical Resistivity	80 Ohm- meter Max
CCS	175kg/cm2 Min