ENVIRONMENTAL SUSTAINABILIY EVALUATION OF FOUNDRY SAND WASTES USING LIFE CYCLE THINKING
Foundry sand consists primarily of clean, uniformly sized, high-quality silica sand or lake sand that is bonded to form molds for ferrous (iron and steel) and nonferrous (copper, aluminum, brass) metal castings. In typical foundry processes, sand from collapsed molds or cores can be reclaimed and reused. Recycling and disposal are current management options for foundry sand. Others applications of the spent foundry sand are the use as a fine aggregate substitute in construction applications and as kiln feed in the manufacture of Portland cement. The aim of this paper is to evaluate the environmental sustainability of the use of foundry sand in the Portland cement manufacture. For this purpose, normalization procedures based on the calculation of a set of normalized indicators in order to get suitable objective functions for the secondary materials optimization have been developed. Sustainability indexes may be considered objective functions for secondary materials. The Environmental Sustainability is based on two different variables: (1) Natural Resources Sustainability (NRS), and (2) Environmental Burdens Sustainability (EBS). The main components of EBS have been classified as atmospheric pollutants, water pollutants, soil pollutants and a fourth group including specific environmental burdens such as noise, etc. This normalization allows the reduction of the complexity in the evaluation of the environmental sustainability of secondary materials. Near 250 atmospheric pollutants can be weighted in a dimensionless indicator for atmospheric impact, 55 aquatic pollutants can be reduced to the indicator of the aquatic impact and the land impact can be managed by one weighted variable.
Environmental Sustainability Foundry sand wastes Life Cycle Assessment (LCA) Life Cycle Thinking (LCT)
R. Aldaco M. Margallo A. Irabien
Univ. Cantabria, Dpto Ingeniería Química y Química Inorgánica, Avda Los Castros s/n, 39005 Santander, Spain
国际会议
北京
英文
93-98
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）