Feasibility of Reclaiming Shell Material from Investment Castings

摘要

The report examines the feasibility of investment shell component reclamation.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 can be recovered in a form suitable for reuse as backup stucco. Reuse of zircon in investment casting may be possible but will require careful qualification testing. Fused and crystalline silica are not reusable for investment casting. The feasibility of reclamation will be influenced by individual foundry choices of materials, composition and shell practice.