Prior to the development of the BBOC, BRM used cupellation in a 15 tonne ( t ) reverberatory cupellation furnace to recover the precious metals from this mixture.
2.
By injecting the oxygen directly into the bath, rather than blowing it on top ( as in the case of the reverberatory cupellation furnace or top-blown rotary converters ), the oxygen transfer efficiency is not impeded by the presence of the slag layer.
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