Pot Tending Machine
POT TENDING MACHINE
PTM is the crucial equipment of large anode pre-baking workshop. It is used in the environment of high temperature, large current, strong magnetic field and HF gas. It can perform the following procedures ANODE CHANGE: Anode in the pots is changed at an interval of every 27 days since daily 1.5 cm of the anode gets consumed. A carbon block is usually 55 cm high of which only 40 cm can be used up. The main reason behind the anode consumption is the following electrolytic reaction which happens to take up the carbon of the anode.
2Al2O3 + 3C = 4Al + 3CO2
Anode change requires a crust breaker to loosen the alumina and break the hard crust so that the extraction devices can grab the anode easily.PTM breaker punch in holes to break the crust.Further shovel is used to scoop out the remaining material on the sides and clean the cavity before bath pipes discharge the bath for covering. The crust pieces are raked out with a perforated alumina rake to prevent them falling into open cavity while lifting the butts. A J-hook senses for any big bath piece which might be left after shoveling. Butts are looked over for crack, molten stub, spikes or mushroom. The shovel in the PTM cleans the cavity once for middle anodes and twice for side anodes. A manual gradienter transfers the anode setting mark from butt to new anode. The new anode is marked 2 cm higher than the old anode and this process is known as Anode Marking. PTM feeds the insulation material on new anodes up to the thickness of 11 –12 cm. When the crust forms around the new anode, anode is covered with crushed bath followed by alumina layers.
ANODE CHANGE
Anode marking
Cleaning the cavity by shovel
Placing new anode
Covering of anode
New anode thus set starts drawing current after 2-3 hours. To check if new anode is set properly, it should withdraw current within the range of 0.5mV to 1.5 mV after 16 hours. Defects
PTM is the crucial equipment of large anode pre-baking workshop. It is used in the environment of high temperature, large current, strong magnetic field and HF gas. It can perform the following procedures ANODE CHANGE: Anode in the pots is changed at an interval of every 27 days since daily 1.5 cm of the anode gets consumed. A carbon block is usually 55 cm high of which only 40 cm can be used up. The main reason behind the anode consumption is the following electrolytic reaction which happens to take up the carbon of the anode.
2Al2O3 + 3C = 4Al + 3CO2
Anode change requires a crust breaker to loosen the alumina and break the hard crust so that the extraction devices can grab the anode easily.PTM breaker punch in holes to break the crust.Further shovel is used to scoop out the remaining material on the sides and clean the cavity before bath pipes discharge the bath for covering. The crust pieces are raked out with a perforated alumina rake to prevent them falling into open cavity while lifting the butts. A J-hook senses for any big bath piece which might be left after shoveling. Butts are looked over for crack, molten stub, spikes or mushroom. The shovel in the PTM cleans the cavity once for middle anodes and twice for side anodes. A manual gradienter transfers the anode setting mark from butt to new anode. The new anode is marked 2 cm higher than the old anode and this process is known as Anode Marking. PTM feeds the insulation material on new anodes up to the thickness of 11 –12 cm. When the crust forms around the new anode, anode is covered with crushed bath followed by alumina layers.
ANODE CHANGE
Anode marking
Cleaning the cavity by shovel
Placing new anode
Covering of anode
New anode thus set starts drawing current after 2-3 hours. To check if new anode is set properly, it should withdraw current within the range of 0.5mV to 1.5 mV after 16 hours. Defects