Universidad Nacional del Centro de la Provincia de Buenos Aires, Centro de Investigaciones y Estudios Ambientales, Becario CONICET, Pinto 399, Tandil, Bs. As., CP 7000, Argentina.
J Environ Manage. 2012 Nov 15;110:77-81. doi: 10.1016/j.jenvman.2012.05.025. Epub 2012 Jun 26.
Waste molding and core sands from the foundry industry are successfully being used around the world in geotechnical and soil-related applications. Although waste foundry sands (WFSs) are generally not hazardous in nature, relevant data is currently not available in Argentina. This study aimed to quantify metals in waste molding and core sands from foundries using a variety of metal-binder combinations. Metal concentrations in WFSs were compared to those in virgin silica sands (VSSs), surface soils and soil guidance levels. A total analysis for Ag, Al, Ba, Be, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Pb, Sb, Te, Tl, V, and Zn was conducted on 96 WFSs and 14 VSSs collected from 17 small and medium-sized foundries. The majority of WFSs analyzed, regardless of metal cast and binder type, contained metal concentrations similar to those found in VSSs and native soils. In several cases where alkyd urethane binder was used, Co and Pb concentrations were elevated in the waste sands. Elevated Cr, Mo, Ni, and Tl concentrations associated with VSSs should not be an issue since these metals are bound within the silica sand matrix. Because of the naturally low metal concentrations found in most WFSs examined in this study, they should not be considered hazardous waste, thus making them available for encapsulated and unencapsulated beneficial use applications.
世界各地正在成功地将铸造行业的废型砂和芯砂应用于岩土工程和土壤相关领域。尽管废铸造砂（WFS）在本质上通常不具有危害性，但阿根廷目前没有相关数据。本研究旨在使用各种金属结合剂组合来量化铸造厂废型砂和芯砂中的金属。将 WFS 中的金属浓度与原始硅砂（VSS）、地表土壤和土壤指导水平中的金属浓度进行比较。对 17 家中小型铸造厂收集的 96 个 WFS 和 14 个 VSS 进行了 Ag、Al、Ba、Be、Cd、Co、Cr、Cu、Fe、Mg、Mn、Mo、Ni、Pb、Sb、Te、Tl、V 和 Zn 的全分析。无论金属铸造和结合剂类型如何，大多数分析的 WFS 都含有与 VSS 和原生土壤相似的金属浓度。在使用醇酸聚氨酯结合剂的情况下，废砂中的 Co 和 Pb 浓度升高。与 VSS 相关的 Cr、Mo、Ni 和 Tl 浓度升高不应成为问题，因为这些金属都被束缚在硅砂基质中。由于本研究中检测到的大多数 WFS 中的金属浓度较低，它们不应被视为危险废物，从而可用于封装和未封装的有益应用。
