Separation and recovery of metals from zinc-treated superalloy scrap. Report of Investigations/1989

Technical Report · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5684741

Laverty, P D; Atkinson, G B; Desmond, D P

The U.S. Bureau of Mines treated mixed and contaminated superalloy scrap by pyrometallurgical and hydrometallurgical methods to separate and recover metal values. Best results were obtained by leaching Zn-treated or atomized scrap with HC1-02 at 95 C and 50 psig O{sub 2}. This resulted in dissolving approximately 98% of the Al, Co, Cr, Cu, Fe, Mn, Ni, and Zn while rejecting over 98% of the Mo, Nb, Ta, Ti, W, and Zr as an insoluble refractory residue. Chlorine was successfully substituted for HC1 to leach Zn-treated scrap but unsuccessful for leaching atomized scrap. The leaching solution was treated by pH adjustment and hydrothermal precipitation at 200 C for 4 h to remove Al, Cr, Fe, and other contaminants as a filterable precipitate. Recovery of Co and Ni would be accomplished by solvent extraction and electrowinning. Chromium recovery as a ferroally was demonstrated.

• Research Organization: Bureau of Mines, Reno, NV (USA). Reno Research Center
• OSTI ID: 5684741
• Report Number(s): PB-89-201370/XAB; BUMINES-RI--9235
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
COBALT
ELEMENTS
EXTRACTIVE METALLURGY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROMETALLURGY
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
METALLURGY
METALS
NICKEL
PROCESSING
PYROMETALLURGY
RECOVERY
RECYCLING
SCRAP
SCRAP METALS
SEPARATION PROCESSES
SOLID WASTES
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES