配方类型：	METALS AND THEIR TREATMENT
配方说明：	Reclaiming Silver from Plating Solutions
配方组成：
配制方法：	The use of zinc dust is an effective method for silver recovery. Theoretically, each ounce of zinc will displace almost 4 ounces of silver. However, at least a 50% excess should be added to avoid redissolution of the silver by the free cyanide present in the bath. A simple test for complete precipitation is to immerse a clean penny or piece of copper wire in the solution. If no whitish film of silver deposits in 5 minutes, the reaction may be considered complete.

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