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Automobile exhaust catalysts and electronic equipment, for instance, are rich in platinum group metals (PGMs). At the end of their lifecycles catalytic converters are smelted in electric arc furnaces (EAF) for PGM recovery. With approx. 40ppm, PGM depleted EAF slags still contain significantly higher amounts of PGMs than common primary sources (3–10ppm), in contrast to which the material is oxidic...