Recovering Technology of Nonferrous Metals in Shredder Residue

摘要

In Japan, disposed automobiles are generally shredded. The valuable metals are recovered from this shredded materials and then the shredder residue is landfilled. However, by the problem of the shortage of reclaimed lands and of the soil pollution caused by the metals in the residue, needs for the material recycling from shredder residue are highlighted. Shredder residue contains nonferrous metals such as copper, lead and zinc. In order to prevent environmental pollution, these nonferrous metals should be recovered from the thermal processed residue of shredder residue.Recovery of nonferrous metals in the incinerated residue of shredder residue has been investigated by Nippon mining & metals group. In Nikko Mikkaichi Recycle Co., Ltd., copper residue and lead slime have been recovered from the incinerated residue in the zinc smelting plant. Copper residue was charged in the converter of copper smelting plant and electrolytic copper was recovered in Saganoseki Smelter & Refinery. Simultaneously, lead slime was treated in the lead smelting plant and crude lead was recovered. The recovery rates of copper, lead and zinc from shredder residue are proximately 90 percent, 96 percent, 74 percent in the investigation.Mitsubishi Materials Corporation has developed the recovery process of copper and lead by carbonizing shredder residue. The carbonized residue from the carbonization pilot plant of shredder residue was smelted and lead was efficiently recovered in crucible test. At the same time, the copper recovery process was investigated and the process by using conventional copper smelting plant was proposed. These processes are one of the effective methods to recover these metals.