Method for improvement of casting quality
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United States of America Patent
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Sep 22, 2015
Grant Date -
Dec 27, 2012
app pub date -
Jun 18, 2012
filing date -
Jun 23, 2011
priority date (Note) -
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Abstract
Systems and methods for improved molding sand performance through use of recovered additives from the existing waste stream in a foundry. Sand, clay, and carbon-containing organic components are wet recovered from a green sand mold foundry dust recovery system. The sand and non-sand fractions may be further treated to reduce water content or adjust the levels of various components to generate a pre-mix additive for the generation of new green sand molds, that may display improved properties at ambient and high temperatures when compared to commonly employed traditional pre-mix. In some examples, pre-mixes having reduced sulfur content are obtained. In several embodiments, the non-sand fraction obtained from bag house dust or dust from mechanical reclamation includes increased levels of bentonite clay and carbon.
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