. Aluminum and iron werenot concentrated in a certain particle size of the milled printed circuitboards. About 95% of the metallic components were separatedinto the heavy fractions from the milled printed circuit boards ofsize >0.6 mm when <5 mm milled printed circuit boards were subjectedto gravity separation using a zig-zag classifier, and theirgrade was slightly improved from 45–55% to 50–60%. For themilled printed circuit boards of size <0.6 mm, the metallic componentswere enriched from 23% to 45% by gravity separation
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