Removal of Nonferrous Metals from Synthetic Automobile Scrap on Heating in a Rotary Kiln

摘要

The report discusses a program to determine the feasibility of removing nonferrous metal impurities from automobile scrap by thermal treatment in a rotary kiln. A series of tests were conducted with synthetic scrap mixtures heated at various temperatures under oxidizing and reducing conditions. Analyses showed that the ingots were essentially free of residual metal impurities except for copper. Test data indicated that in an oxidizing atmosphere the percentage of copper removed increased with treatment temperature. Percent of copper removed in a reducing atmosphere was found not to be temperature dependent. A significant finding was that copper was embrittled under some of the operating conditions and was mechanically removed by fragmentation. (Author)