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Title:The Feasibility of Reclaiming Shell Material from Investment Casting
Author(s):Peters, Timothy M.; Twarog, Daniel L.
Contributor(s):Illinois. Hazardous Waste Research and Information Center; University of Missouri-Rolla; American Foundrymen's Society
Subject(s):Foundries -- Waste reduction
Abstract:This report examines the feasibility of investment shell component reclamation. Shell material components and their compositions are investigated with an industry survey, a study of the available literature, and analysis of specimen shell materials. physical properties and factors related to the reclamation and reuse of shell materials are described. Well known mineral processing methods are capable of producing concentrates of the various shell components. The theory and techniques of some applicable processes are discussed to assist with the development of reclamation operations. The recommended methods are; comminution by roll crushing, component concentration by screening, gravity settling or heavy medium separation. Aluminosilicate stucco (a major component of many investment shells) can be recovered in a form suitable for reuse as backup stucco. Zircon (a minor component in many shell compositions) -can be concentrated in an impure form, and subsequent caustic liberation treatments can remove the intermixed silica phases. Reuse of such zircon in investment casting may be possible but will require careful qualification testing. Fused and crystalline silica (major components of most shell compositions) are not reusable for investment casting. The feasibility of reclamation will be influenced by individual foundry choices of materials, composition and shell practice.
Issue Date:1992
Publisher:Hazardous Waste Research and Information Center
Series/Report:TR Series (Hazardous Waste Research and Information Center) ; 004
Genre:Technical Report
Sponsor:HWRIC Project No. RRT-10
NTIS PB92-162197
Date Available in IDEALS:2007-09-07

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