Bloom

A bloomery is a type of furnace once widely used for smelting iron from its oxides. A bloomery's product is a porous mass of iron and slag called a bloom. This mix of slag and iron in the bloom is termed sponge iron, which is usually consolidated (shingled) and further forged into wrought iron.
Source: Wikipedia. 

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Luppe
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Loupe
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fornace di riduzione
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wolf