Metal founding – Process – Including recycling of process material
Patent
1988-03-04
1989-03-28
Silverberg, Fred A.
Metal founding
Process
Including recycling of process material
164529, 423211, 423263, B22C 100, B22C 900
Patent
active
048155160
ABSTRACT:
Y.sub.2 O.sub.3 is recovered from investment casting shell molds by introducing used mold materials into a dissolution reactor preferably consisting of a rotating vessel having an interior lining of acid and abrasion resistant material. An acid is combined with the materials in the reactor and agitated for a selected time period. Thereafter, the liquid remaining in the reactor is separated from the residual solids and removed. The liquid contains dissolved Y.sub.2 O.sub.3 which is precipitated, preferably using oxalic acid to produce yttrium oxalate [Y.sub.2 (C.sub.2 O.sub.4).sub.3.9H.sub.2 O]. The Y.sub.2 (C.sub.2 O.sub.4).sub.3.9H.sub.2 O is ultimately removed from the solution and calcined to produce high purity Y.sub.2 O.sub.3.
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Kemp William W.
Sturgis David H.
Batten, Jr. J. Reed
Precision Castparts Corp.
Silverberg Fred A.
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