Abstract
The recycling of scrap containing tungsten is by no means a modern procedure. On the contrary, it has been established for many decades. Even before anyone thought about recycling of glass, paper, and aluminum—as is common today in most industrialized countries—a considerable amount of tungsten was being reclaimed from different types of scrap. The reason can be easily explained: As outlined in Chapter 2, most tungsten ores contain less than 1 wt% WO3 and very seldom higher concentrations. In Table 11.1, different types of scrap containing tungsten and the corresponding tungsten contents are listed. It is evident that the least valuable scrap, like low-grade grinding sludge, contains about 15 times more tungsten than an average ore. Most scrap materials are even richer in tungsten than ore concentrates.
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