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Li-qua′tion.

Silver is separated from copper by melting the alloy with the addition of lead, and cooling the triple alloy suddenly in the form of cakes. These cakes are heated to such a degree on an inclined hearth as to cause the alloy of lead and silver to run off, and allow the copper to remain.

The lead and silver may be separated by cupellation or by Pattinson's process, in which the alloy is allowed to cool slowly and the crystals removed as they form, leaving the alloy relatively richer in silver. By a repetition of the process an alloy of great richness is procured, and the operation may be followed by cupellation, in which the lead is oxidized, melts, and runs off. See lead-furnace.

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H. L. Pattinson (1)
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