Pre/post shutdown guidelines

A production shutdown is an opportunity to inspect, repair and prepare the lining of the facilities: pre/post shutdown guidelines for induction, channel and aluminium furnaces and ladles.

- If the linning is just installed/few castings, allow freedom of movement in cooling.
- If the lining is worn, provide for replacement and do not risk it.
- After the stop, increase the time of starp in cold and start up.
- If cracks are visible in the case of metal casting furnaces, help to close them with a mass type ALUPATCH-M, INSEPLAST-90PF, INSEGUN 95 E, SILPACHT etc.
- It is important to check that the electrovalves of the emergency coil cooling circuit are working properly.
- Check that the emergency water tank always has water.

- We can NOT cut the current and the inductor must be in operation.
- Compensate high and low voltage so that the metal is kept at the lowest possible temperature.
- Note that this circumstance can generate ring seals. If this happens, increase time in high and/or foresee change of inductor.
- Pay attention to spouts. If the temperature of the metal drops too low, it may solidify. Place BIO CERAMIC BLANK and always check that the metal is liquid.

- Proceed with the usual refractory maintenance.
- Check for specific wear.
- Extend drying and preheating time when starting up.

- Empty the furnace so that the minimum possible accumulation of solidified aluminum is retained inside it. When this aluminum cools down, it can shrink and take part of the refractory lining with it. There are cleaning protocols and materials to support this work. Consult us!
- Turn off the burners and close/seal the doors, windows, spouts, open wells, etc. as best as possible. the The objective is to lower the temperature as slowly and homogeneously as possible.This will prevent cracking of the lining and subsequent repairs. The CERAMIC FIBER BLANK is your best ally at this point!
Start up:
- Remove any remaining solidified aluminium that may have been left inside the furnace after shutdown. There should be no option of liquid aluminium (approx. 645 °C) before the lining has expanded to its working position.
- Make a controlled heating curve to ensure temperature homogeneity throughout the investment until the working temperature is reached. Do not reload until the working temperature has been reached.