Illuminating tungsten's life cycle in the United States: 1975-2000.

摘要: Tungsten’s unique properties, such as its high density and melting point, are manifest in a variety of technological applications, attention has recently centered upon the health environmental effects tungsten. Utilizing material flow analysis, amounts tungsten produced, fabricated manufactured, entering use, waste management United States from 1975−2000 were determined, with inclusion net trade, paid to way that partitions into in-use reservoirs quantities enter environment result anthropogenic processes. The results two approaches presented: first, typical, approach for historical analysis studies, whereby use products over time was approximated using end-use sectors used by Bureau Mines Geological Survey (the “end-use sector model”) second, more detailed pattern of...