World of Metallurgy ERZMETALL 68 2015 No 3 141 Markus A Reuter et al Lead Zinc and their Minor Elements Enablers of a Circular Economy 3 System integrated lead and zinc production To fully optimize the WoM shown in Figure 8 a deep understanding of the technology and the systems is re quired as explained by Figure 9 With this understanding system integrated metal production can help optimize the resource efficiency of the complex WoM Understanding the baseline of the WoM will assist in innovating the future circular economy system 3 1 System integrated metallurgical processing SIMP infrastructure Figure 10 provides a brief overview of the linkage of vari ous technologies that link lead zinc and copper metallur gy This shows how the values from various streams can be recovered to ultimately maximize resource efficiency The recovery of elements in solutions molten metal speiss flue dust gas phase slag etc is shown The technologies have been summarized in various publications 20 33 In a Fig 10 Key lead and zinc metallurgical processing technology that provides the backbone on which various technology elements are recovered Figure 10 Reuter Fig 11 The traditional roast leach electrowinning processing of zinc concentrate and various other options to treat residues including direct zinc smelting Figure 11 Reuter Electrowinning Zn Metal Traditional Roast Leach Electrowinning RLE Purified Zinc Solution Traditional Leach Residue Treatment Solution Solution Neutral Leach Residue Jarosite main residue from RLE Goethite main residue from DL Hematite 1 plant Akita Zinc Recovered Zinc Solution Further Treatment e g Jarofix Dumping Neutral Leach NL Strong Acid Leach e g Zn Purification Roasting SO2 ch R es id ue ca 2 0 Zn Other e g paragoethite Residues PbAg Residue ZnO Direct Leaching DL S recovered via flotation Fe Precipitation Precipitation For RLE after Acid Leach Directly for Direct Leach solution O2 O2 Zn Concentrate P rim ar y Le ac z in c fe rr ite Fume TSL Kaldo Other TSL Zn Fumer ZnO Fume EAF Dust Other 2 TSLs SO2 TSL Residue Treatment commercial Benign Slag Disposal Sale Benign Slag TSL Direct Zinc not commercial

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