Amritesh Industries

Tamping Paste, also known as Thermal Paste is used in the Ferro Alloys & Allied Industries for the lining of the furnace. The paste is produced from a mixture of different Carbonaceous material (Calcined Petroleum Coke, Calcined Anthracite Coal etc.) and Soft Pitch as Binder.

Manufacturing Process of Tamping Paste

Tamping Paste / Thermal Paste is manufactured by screening the CPC and or ECA to different fractions and then pulverizing the same. After the pulverization the TP is stored separately. After this, predetermined quantities of different fractions of the TP are weighed and transferred to the Sigma Mixer where it is heated to a predefined temperature by thermic fluid. The required quantity of Binder is also weighed and added into the Mixer. The mixing is continued for a specific period known as the Mixing Cycle. At the end of the Mixing Cycle, the mixed material is dumped into the mould box for casting into blocks which are then made ready for shipment.

Quality and Specification

The thermal insulation of the furnace pots is essential. Due to this it is important that the Tamping Paste does not have any excess binder and fills the walls of the furnace, maintaining proper insulation and minimizing the heat loss.

Typical characteristics of CPC based TP are as follows

Green Paste

Baked Paste at 1000 deg.Centigrade

Volatile matter	12 % max
Fixed Carbon	87% Max
Ash	1.0% Max
Plasticity	8-15%
Apparent Density	1.55gm/cc Min
Binder Content	19-21%

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 TP are as follows

Green Paste

Baked Paste at 1000deg Centigrade

Volatile matter	11% max
Fixed Carbon	84% max
Ash	5.5% Max
Plasticity	5- 10 %
Apparent Density	1.55gm/cc Min
Binder Content	15-17%

Apparent Density	1.36 gms/cc Max
Electrical Resistivity	80 Ohm- meter Max
Compressive Strength	200kg/cm2 Min

Manufacturing Process of Tamping 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.