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Leaching aluminum-superalloy melts with hydrochloric and sulfuric acids.

Authors
Atkinson-GB; Nicks-LJ
Source
Conserv Recycl 1986 Jan; 9(2):197-209
NIOSHTIC No.
10005215
Abstract
The Bureau of Mines investigated a method for increasing the leaching rate of bulk superalloy scrap to facilitate recycling and recovery of critical metals such as ni, CO, and cr. Superalloys were melted with 20%, 30%, 40%, and 50% al to form intermetallic compounds. The melts were easily crushed to a convenient particle size and leached rapidly with hydrochloric and sulfuric acid solutions. Leaching 1/2-in pieces of scrap in-738 with excess 6n hcl at 95 deg c for 2 h resulted in only 0.5% Dissolution, whereas leaching 10 g of minus 20 mesh 30% al-70% in-738 with excess 6n hcl at 95 deg c for 2 h achieved a 96.2% Dissolution.
CODEN
CRECD2
Publication Date
19860101
Document Type
OP; Journal Article
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
OP 94-86
Issue of Publication
2
ISSN
0361-3658
NIOSH Division
RERC
Source Name
Conservation & Recycling
State
NV
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