Papers by Keyword: Spent Foundry Sand

Abstract: Industrialized products demand huge quantities of raw material, and generate enormous volumes of residue. This fact has caused an imbalance in the environment, such as the soil, the water tables, ecosystems and public health. The foundry industry, known for being one of the biggest users of raw material, is among the major pollutants. Concomitantly, the civil construction sector is notorious for its huge consumption of natural resources, but in contrast, it has the potential to aggregate residues from other industries, resulting in added- value products. Recycling is one of the alternatives found when trying to lessen the environmental impacts created by industrial waste, transforming residue into useful products for society. The goal of this research is to analyze the use of spent foundry sand (SFS) and foundry exhausted dust (ED) in the making of interlocking concrete paving blocks. These blocks have been made with foundry sand waste as aggregate and this element has been substituted partially by 0, 5, 10, 15 and 20% with exhausted dust. The blocks were technically analyzed for their compressive strength, measurement of dimension and water absorption. The results obtained concerning compressive strength were below the standard specification, whereas the dimensions and water absorption testing were in accordance with the Brazilian National Standards Organization NBR 9781 [1].

Abstract: Thermal stabilization is used to reduce the turbidity of spent foundry sands (SFSs). Effect of stabilized temperature and thermal stabilized time in thermal stabilization is estimated by turbidity of SFSs in thermal stabilization. The turbidity of furan sand is 984 FAU and almost 15 times as high as that of other sands such as CO2 sand and green sand. Furan sand contains furan resin, but CO2 sand and green sand do not use resin chemicals. The turbidity of furan sand can be reduced by stabilization of furan resin in thermal process. In the process of thermal stabilization, fixation of furan resin by heating occurs and resin can be in the state of insolubility. The turbidity of furan sand is sharply decreased within thermally stabilized time of 2 hrs and decreased with increasing stabilized temperature. Turbidity in thermal stabilized time of 2hrs and stabilized temperature of 600°C is almost 10 FAU. Hence, thermal stabilization can be applied to reduce the turbidity of SFSs generated from iron foundry industry.

Abstract: Spent foundry sand (SFS) from cast iron industry mixed with loess was characterized to recycle spent foundry sand as ceramic support materials. Since SFS mostly consists of sand including binding agents and residue [1], it was used as permeable media, and loess, which has highly adsorptive and reactive properties, was used as support materials Leaching tests such as Korean Leaching Test (KLT) and TCLP (Toxicity Characteristics Leaching Procedure) showed that spent foundry sands from cast iron industry were not hazardous. Turbidity in furan sand was much higher than that in other sands, and turbidity was almost not changed with increasing amount of loess. The order of ORP (oxidation-reduction potential) in spent foundry sands was green sand > furan sand > CO2 sand. ORP was decreased with the amount of sand in furan sand and CO2 sand but was increased with the amount of sand in green sand. Hence, mixture of SFS and loess can be used as ceramic support materials with reductive or oxidative capability.