Separation Technologies for the Industries of the Future (1998) / Chapter Skim
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7 Metal Casting Industry
7 Metal Casting Industry
Pages 68-73
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From page 68... ...
The metal casting industry, which employs approximately 210,000 workers, is dominated by small businesses. Of the 3,100 metal casting establishments in the United States, 80 percent employ fewer than 100 workers (OIT, 1997c)
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From page 69... ...
The core is then placed in the mould, and the two mould boxes are assembled into a "flask" ready for casting. In the mould production process for investment casting, a wax pattern is repeatedly dipped into ceramic slurry and coated with dry ceramic grit until the mould is of adequate thickness.
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From page 70... ...
These operations depend on intermediary scrap processors who separate and segregate scrap for resale. Separation processes used at these facilities include hand sorting, identification by visual or chemical means, magnetic separation, and eddy current separation.
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From page 71... ...
Like core room sand, spent mould sand can be reclaimed using dry attrition scrubbing with dust removal Wet scrubbing is used less frequently because of drying and dewatering problems. Core sands are typically mixed with resins that act as binders to ensure that the shape of the core is maintained during casting despite pressure from the molten metal.
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From page 72... ...
technologies to reduce the drying time of investment casting mould production · better dust removal technologies · improved technologies to remove impurities from molten metal · methods for preventing or minimizing gas inclusions in gates and risers · methods for efficiently and cost-effectively separating gate and riser scrap by impurity level · economical and efficient means of separating nonfoundry scrap · better methods for reclaiming core room sand (contaminated with resin and other chemicals) , including improved sand drying and sludge dewatering technologies
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From page 73... ...
I @ boiler methods far reclaiming sh~-out house sand (conlamin~cd with calcified clay and mc[a1 piccesj cosLe~cdve and efficient methods of reclaiming cleaning room sand (sand with mete smears and ~ changed size db~ibudonj @ lower cost oxygen far Coy- burners @ better methods far removing specific components Mom gaseous Id liquid .
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