When an aluminium furnace fails, it almost always starts at the same narrow line: where the melt meets the air. The bath line is the most demanding zone in the entire furnace.
When an aluminium furnace fails, it almost always starts at the same narrow line: where the melt meets the air. The bath line is rarely more than a hand's breadth high — and is nevertheless the most demanding zone in the entire furnace.
The reason lies in the chemistry. At the bath line, liquid aluminium, oxygen and refractory material all come together. At this three-phase boundary, oxidation and corundum growth attack most aggressively — this is where the corundum noses form that narrow the furnace cross-section.
At every inspection we check this line first. That turns an impending failure into a plannable partial repair.
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