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How do U-shaped tubes collect mercury after the roasting process?
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mercury processing
Mercury in the bulb of a thermometer.
In the pyrometallurgical extraction of mercury, the roasting process liberates the metal as a vapour by heating sulfide ore above its boiling point. To collect the metal, these hot gases are passed through a series of U-shaped tubes, which serve to condense the mercury vapour into its liquid phase.1