Recovery of Copper from Motor Scrap Utilizing Ammonia Leaching Technique. Stuidies on the selective recovery of copper and iron from motor scrap. (2nd Report).

To develop a hydrometallurgical process for the selective recovery of copper and iron from motor scrap. the leaching of copper with Cu (II). ammine solution using a spray-type or an up-stream penetration type reaction tank has been examined, and a closed circuit process has been proposed for the copper recovery. Copper can be leached by either spray leaching or up-stream penetration leaching with large leaching rate, where the resultant Cu (I) is oxidized to Cu (II) with air during the circulation of leachant. The leaching rate is greater in the up-stream penetration leaching than that in the other, since the whole copper sample is submerged in the leachant in the up-stream penetration leaching. Copper is leached efficiently from motor scrap as well as copper wire. Copper can be recovered from motor scrap in the closed circuit process which consists of the Cu (II) ammine leaching, solvent extraction with Lix 84, and electrowinning of copper from the stripping solution.