METHOD FOR SEPARATING AND COLLECTING USEFUL METALS FROM WASTE LEAD-FREE SOLDER

摘要

Disclosed is a method for separating and collecting useful metals from a waste lead-free solder. The method for separating and collecting useful metals in the waste lead-free solder according to the present invention, comprises: a leaching step of introducing the waste lead-free solder, which comprises tin, copper, and silver, into a solvent comprising a solubility increasing agent for increasing the solubility of tin (IV) ions and tin ions so as to leach tin from the waste lead-free solder, and then settling copper and silver; a solid-liquid separation step for separating copper and silver that are combined in a solid state and the solvent in which tin ions in a liquid state are dissolved after the leaching step; a tin collection step of collecting tin from the solvent; and a selective collection step of separating copper and silver in the solid state.