Carbon Plant – Prebaked Technology
In prebaked technology the anodes used are termed as prebaked anodes which are made from a mixture of petroleum coke aggregate, coal tar pitch binder, butts and green scraps moulded into blocks and baked in separate anode baking furnace at about 1100±20 °C. An Aluminium rod with iron studs is then cast into grooves on the top of the anode block as a support to the anode and which when positioned in the pot conducts the electric current to the anode.
Prebaked anodes have to be removed at regular intervals, when they have reacted down to one third or one fourth of their original size. These remaining anodes are termed as butts and are usually cleaned at rodding shop. The cleaned butts are then crushed and used as a raw material in the manufacture of new anodes.
The technology employs -