Process to Recycle Contaminated Superalloy Scrap.
Lutz-LJ; Parker-SA; Holamn-JL; Stephenson-JB
Paper 2nd Int'l Symposium: Recycling of Metals & Engineered Materials TMS 1990 :159-169
The U.S. Bureau of Mines has developed a process to recover ni, CO, cr, and other metals from mixed and contaminated superalloy scrap. The superalloy scrap is melt-carburized and cast into anodes for electrodeposition. The carburizing-electrorefining process recovers approximately 90 pct of the ni-co available from the scrap as a 99+ pct pure ni-co alloy. Carburization results in cr and other refractory metals reporting to the anode alloy primarily as carbide phases. These carbides form an insoluble anode sludge during electrolysis. Electrorefining data and operating parameters are given for a 10-l seven-electrode compartmented cell. Techniques for the removal of fe, cr, and trace impurities from the recycled electrolyte are outlined.
Paper 2nd Int'l Symposium: Recycling of Metals & Engineered Materials; TMS, 1990, PP. 159-169