Equipment developments in the world of remelting mean that the traditional process route may be changing. In a departure from the style of our other blogs, I’d like to use this one to pose a question. Do you think we’re about to see the end of the holding furnace when melting uncoated/clean scrap in a typical remelt?
The traditional aluminium remelt processing route for melting uncoated scrap typically involves the following equipment:
The holding furnace can also decouple the melting furnace from the casting pit to enable the melting furnace to maximise its output.
A more recent trend however has been to use a tilting melter/holder. This combines the operations of both furnaces to achieve steps 1 and 2 above. An example of such a furnace can be seen via this link and in Figure 1.
There have been many advances in furnace charging equipment and molten metal treatment over recent years. Taking these into account, it’s generally thought that the operational advantages of a tilting melting/holding furnace are as follows:
Whilst the initial cost of a tilting metal/holder should be less than that of separate melting and holding furnaces, to maximise the efficiency of the casting pit, it is likely that you’d need multiple furnaces. Depending upon the casting pit capacity, I anticipate that typically you’d require three tilting melter holders to replace a two melter and two holder configuration. Consequently, the initial capital costs of both configurations may not be significantly different.
The questions is, therefore, to melt uncoated scrap, are the days of the traditional melting and holding furnace configuration numbered, and is the tilting melter/holder the future?
I would be very interested to hear the views of the aluminium melting community on this topic. Please contact me directly or share your views via our LinkedIn page where you will see this blog posted.