Carbon Tamping Paste
Tamping Paste, also known as Thermal Paste is used in the Ferro Alloys & Allied Industries. This paste is produced from a mixture of different carbonaceous material like CPC/ECA and Soft Pitch as binder.
Manufacturing Process
The first step in the manufacture of Tamping / Thermal paste is screening the Calcined Petroleum Coke (CPC) and or the Electrically Calcined Anthracite (ECA) to different fractions and milling and storing it separately. Following this, pre-determined quantities of different fractions are weighed and transferred to the Sigma Mixer which is heated to a predefined temperature by the 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 onto the mould box and cast into blocks which are then ready for dispatch.
Quality Specification
The thermal insulation of the furnace pots is essential. It is important that the Tamping paste does not have any excess binder and fills the wall of the furnace, maintaining proper insulation and minimizing the heat loss.
A Typical Characteristics of CPC base Carbon Tamping Paste is as follows:
| GREEN PASTE: | BAKED PASTE AT 1000o C | ||
| Volatile Matter | 12% max | Apparent Density | 1.35 gms/cc min. |
| Fixed Carbon | 87% min | Electrical Resistivity | 90 ohm M max |
| Ash | 1.0 % max | Compressive Strength | 200 kg/cm2 min. |
| Plasticity | 5 – 15% | Porosity | 35% max. |
| Apparent Density | 1.55 gms/cc min. | ||
| Binder Content | 19 – 21% | ||
A Typical Characteristics of ECA base Carbon Tamping Paste is as follows:
| GREEN PASTE: | BAKED PASTE AT 1000o C | ||
| Volatile Matter | 11% max | Apparent Density | 1.38 gms/cc min. |
| Fixed Carbon | 84% min | Electrical Resistivity | 70 ohm M max |
| Ash | 5.5 % max | Compressive Strength | 235 kg/cm2 min. |
| Plasticity | 5 – 12% | ||
| Apparent Density | 1.58 gms/cc min. | ||
| Binder Content | 15 – 17% | ||
