Pot Tending Machine Essays

Pot Tending Machine Essays Pot Tending Machine Essay Pot Tending Machine Essay resulting in voltage shake. Iv) Improper Anode Covering- This causes anode burning and drop outs.The dally production of metal In the pot room Is 2-2. 4 tons approximately. I Norte, tenure Is a need to nave a magnetic Ana tamale Dalliance, metal pad stability and to prevent extra heat loss due to high metal level. For this purpose, tapping is performed using a 16 ton capacity nonmagnetic hook which maintains an optimum bath level limiting the cooling tendency of pot. 16 MAT Tapping trolley Firstly, the pouring spout is closed with an asbestos ring. The tapping hose pipe goes into the venture. The tapping hole is made bigger or skimming is done to scoop out coke or lose carbon dust using a preheated carbon scoop. Around 3 ladles, again preheated to avoid explosion with moisture, are used with a tare weight of not more than 8000 keg. The siphon of the ladle is placed into the tapping hole and the air valve is opened to start the tapping operation. The final weight of the ladle must not exceed the desired weight by more than 20 kegs. After tapping; the ladle is placed on Mats for transport. A pot controller keeps a check on the tapping process based on he voltage increasing trend. If the voltage detected is higher than 80 NV, the primary anode is lowered automatically for about 0. 8 seconds. This helps in maintaining the anode cathode distance constant, when metal level falls during tapping. Further if anode effect occurs, tapping is put to a halt till the termination of anode effect. If the voltage deviation between expected voltage and the voltage detected in continuous 3 min after aluminum tapping starts is less than numb or total time of anode lowering is less than cosec, automatic aluminum tapping control exit function is activated. The final metal tapping amount depends on pot temperature, metal height, bath height, and Creosote ratio and noise level within the pot. Other factors controlling the tapping amount are voltage shake, anode effects and other abnormalities. BEAM RAISING: As already mentioned, the anode beam gets consumed eventually and has a total traveling distance of only 40 SMS, it needs to be raised to maintain a constant anode and cathode distance of 4. 5 SMS. Beam raising employs two auxiliary hooks of 16 tons capacity each for carrying the beam raising Gig. All through this, a hose reel coming out of APT gives a compressed IR supply to the beam raising assembly for maintaining a recommended pressure of 6 bars. Each anode rod is inserted into the green legs of Gig frame and the hooks are left loose so that whole frame rests on superstructure of pot . A wrench is lowered until the tool is completely on the spindle of the anode clamp . So now, the clamps are loosened and there is a horizontal beam raising ensuring pot voltage does not exceed 200 NV. When the beam rises to the required point, all the clamps are tightened, anode rods are released, Gig frame moves to a clear position above the pot ND the same operation goes on in next half of the pot.