Mid-infrared spectroscopic analysis of chemically bound metalcasting sands

Abstract

a b s t r a c tFoundries around the world discard millions of tons of sand each year even though they can be beneficially used in manufactured soils and geotechnical applications. Despite their usefulness as an aggregate replacement, some environmental authorities are concerned over potential negative impacts associated with residual organic binders in waste foundry sands (WFSs). In this study, chemically bound molding and core sands were obtained from aluminum, bronze and iron foundries that used alkyd urethane, phenolic urethane, Novolac, and natural organic binders. The aim was to use mid-infrared (MIR) spectrometry to assess binder changes within the sands during the casting process. Bands associated with C H stretching were detected in most WFSs. Mid-infrared spectra and total carbon data demonstrated that organic binders closest to the molten metal interface and subjected to the highest casting temperatures exhibited the most thermal degradation. Our results also provided preliminary evidence that MIR spectroscopy could potentially be used as a method to quantify residual binder in WFSs.Published by Elsevier B.V.

Polymer Binder BioCo3 with Silicates and its Application to Microwave-Cured Moulding Sand

“…This demonstrates the presence in the silanol group's siliconbased interaction system. The wavenumber corresponding to the 1737 cm -1 was assigned to the C=O vibrations in the carboxyl group [37]. As the temperature rises, it is shifted and at 420°C it disappears.…”