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Slide 16


    Type: Picture Slide
    Content: Illustration of workers pouring molten metal into molds.

    Speaker Notes: In the foundry environment, for example, sand is used to make molds into which molten metal is poured. In addition, molds may be coated with flint and silica to prevent the sand from adhering to the poured forms. Materials are poured into these molds in the molten state. The heat released during cooling of the metal dries the sand, which can release large amounts of dust when the forms are separated from the molds during shake-out or knockouts. Other processes in foundries, including sand screening, sand recovery, conveying and grinding, also create exposures to silica dust.