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2. Physical and physico-chemical preparation processes
2.1 Sorting by density
This sorting method involves immersing the objects to be sorted, which are characterized by different densities, in a dense liquid with a pre-adjusted density.
Until the early 1960s, old casings were sorted by hand, then melted in a selective melting furnace.
The 1960s and 1970s saw the pioneering application of density sorting to metal sorting.
Between 1970 and 1990,...
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Physical and physico-chemical preparation processes
