Use of an integrated approach to characterize the physicochemical properties of foundry green sands

Abstract

a b s t r a c tA fresh green sand, spent green sand, and a weathered spent green sand (wSGS) from a foundry landfill were analyzed using diffractometry, electron microscopy, fluorometry, granulometry, spectrometry, and thermogravimetry (TG). Our objective was to understand how the physicochemical properties of the foundry green sands change from their original form after being subjected to the casting process, then after weathering at the landfill. A quantitative phase composition model was also postulated for each material based on the TG results and it was found to be the most reliable and informative quantitative data for this type of residue. The weathered sample, that remained in a landfill for two years, was found to be composed of almost pure sand. Because of the weathering process, it may be possible to use the wSGS as a virgin sand replacement in the regeneration system or in geotechnical applications where bentonite would affect the properties of the final product.Published by Elsevier B.V.

A novel use of calcium aluminate cements for recycling waste foundry sand (WFS)

“…The usual fate of this sand -several MT per year -is to be landfilled after a previous process of solidification/stabilization. Owing to high landfilling costs and environmental concerns, some researchers have reported other management alternatives for these polluted WFS, such as subbases, soils, ceramics, controlled-low-strength materials and concretes [4][5][6][7][8]. In these last two cases, WFS can be used to partially replace normal sand.…”

Metals in Waste Foundry Sands and an Evaluation of Their Leaching and Transport to Groundwater

“…Brazil has nearly 1,300 foundries (Modern Casting 2010), producing approximately 3 million tons of WFS annually, with most of this material being discarded in landfills (Carnin et al 2012). Many of the foundries are located in the southern and southeastern states of Santa Catarina, Paraná, Rio Grande do Sul, Minas Gerais, and São Paulo.…”

Effect Of Environmental Load On The Toxicity Of Bottom Sediments

“…In FTIR spectrum the characteristic bands of carbonate vibrations at 1 418 and 1 023 cm -1 were also seen (CARNIN et al, 2012), or it could be organic proportion. To recognize the mineral species the positive identification of many characteristic bands of individual minerals as possible in the whole 4 000-400 cm -1 range is needed though the OH stretching region which is perhaps the most important diagnostic part of the spectrum.…”