ecoinvent data v2.0 Metals (for ICT): Introduction Hans-Joerg Althaus, Empa 2 nd International ecoinvent Meeting Lausanne, March 14, 2008
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1 2 nd International ecoinvent Meeting Lausanne, March 14, 2008 ecoinvent data v2.0 Metals (for ICT): Introduction Hans-Joerg Althaus, Empa 2 Presentation: Hans-Joerg Althaus
2 Session overview Introduction Hans-Joerg Althaus, Empa Modelling Principles and Results Mischa Classen, Empa Gold and Silver Sybille Büsser, ESU-services ( see separate file!) Discussion 3 Presentation: Hans-Joerg Althaus Metals in ecoinvent data v Datasets, 110 new ones 92 end-user Datasets, 32 new ones Existing Datasets partly updated and refined some relevant changes in LCIA results 4 Presentation: Hans-Joerg Althaus
3 Metals in ecoinvent data v2.0 New data mainly for metals used for ICT Most metals produced from coupled resources complex modelling necessary Many metals produced from very low concentrated ores relevant influence of allocation procedure 5 Presentation: Hans-Joerg Althaus
4 2nd International ecoinvent Meeting Lausanne, March 14, 2008 metals: Modelling Principles and Results Mischa Classen, Empa Dübendorf 7 Overview Objectives and approach for v2.0 Implementation of LCI-extension Accounting for resource use Co-product allocation Correction for mass balance Conclusions Overview of valuation results Changes of selected indicators with v2.0 8
5 Metals in ICT Metals play a vital role in consumer products Ever more complex materials in increasing pace developed Small amounts of expensive materials used Challenge of covering the most relevant metals with LCI 9 Metals in ICT - Uses Metals are used in EEE as Bonds and Contacts Silver Gold Copper Platinum Group Metals Semiconductors Silicium Cadmium Telluride (CdTe) Gallium Arsenide (GaAs) Conductive Layers Indium Tin Oxide (ITO) Capacitors Tantalum Powder 10
6 Metals in ICT - Sources Sources of the identified new metals Cd In Te Ag Au Ta Ga Lead / Zinc Copper Gold Tantalum Aluminium 11 Metals in ICT - Web of Metals Orebodies contain charactersitic mix of metals Apart from mainprocucts: Co-products By-products Inpurities Guidance for LCI modelling: Which coproducts? Nature of allocation ~100% >50% Wheel of metals (Reuter, JOM 2004) 12
7 Modelling Approach I Gallium: Co-Product of Aluminium extraction Low economic interest for Alu industry, price determined by purification Allocation of upstream burden based on economic criteria zero-allocation Allocation of resource based on physical criteria Resource Ga in bauxite Gallium in Bayer liquor Purification Process SG Gallium ~100 mg Ga / litre No further upstream processes Treat Resource like Technosphere process Aluminium Inventory not affected 13 Modelling Approach II Tellurium: Co-Product of Copper-extraction, jointly with Silver Some economic interest for Copper industry (namely Silver) Allocation of upstream burden based on economic criteria Proceeds of the final commodities Tellurium and Silver Allocation of resource based on mass Approximate upstream processes with existing LCI 14
8 Modelling Approach II Aproximate upstream processes with existing LCI Coupled resources Cu, Mo, Ag, Te Cathode Copper kg 1 kg Refining of Cu Clone Copper 1.63 g Copper Inventory not affected Anode Slime Creation of a Clone copper dataset. Silver Tellurium 15 Modelling Approach III Silver, Indium and Cadmium Pb/Zn = important Source Full extension of existing LCIs Adapt elementary flow Co-product ratio Allocation Mass balance correction Coupled resources, Pb, Zn, Ag, In, Cd Winning of Pb Mining of Pb / Zn Winning of Zn Silver Indium Lead Zinc Cadmium 16
9 Designation of Resource flow Silver, 0.007% in sulfide, Pb 3.0%, Zn 5.3%, Ag 0.004%, Cd 0.18 %, In %, in crude ore, in ground Based on ore concentrations, But: no distinguishable ore type for co-product metals Harmonised with LCI model Production ratio of carrier metal and co-product Extraction yield Processing yields Concentrations have to rely on back-calculations global production of carrier metal (e.g. Lead) and co-product metal (e.g. Silver) 17 Production Ratio of Co-product Scaled to world wide production, eg. Silver from Lead cycle 5'000'000 4'500'000 4'000'000 3'500'000 3'000'000 << right: Pb / tpa' Ag / tpa Refinery: left >>' 50'000 45'000 40'000 35'000 30'000 21% Ag from secondary 31 % Ag from lead 24% of tpa Ag 0.142% of Pb production 2'500'000 2'000'000 25'000 20'000 Per kg Lead 1.42 g refined Silver, or 1'500'000 15' g Parkes 18% Ag 1'000'000 10' kg ore 0.08% Ag 500'000 5' kg minerals in 0.007% Ag kg crude % Ag 18
10 Production Ratio of Co-product Top down vs. bottom up, eg. Indium from Zinc cycle Discrepancy: Avg. grade: 50 ppm Back-calculated: 19 ppm 50ppm would mean over the double global output than actually reported Schwarz-Schampera & Herzig (2002) Assumption: not all of the In in the extracted ore is refined. 40% of the In-values are dumped with the gangue. 19 Allocation procedure By revenue Cd considered inpurity: zero-allocation Split refined commodity vs. Intermediate e.g. Silver from Lead refining Refining of Lead 8.1 g allocate intermediate containing 18% Silver At what price? Parkes Crust 1.42 g 1 kg Silver Lead 270 $ / kg 1.2 $ / kg avg
11 Allocation procedure Reasoning Intermediate (Parkes Crust) for free Targeted profit at company level: 10% 270 $ / kg margin What would be the max. price for external purchase? = opportunity cost Same as margin, 10 % of proceeds by refined commodities, disregarding subsequent possible process losses 270 $ / kg proceeds Refining costs proceeds Maximal price for external purchase Refining costs 21 Allocation procedure Calculation scheme All metal values in intermediate accounted for Total process yield considered 22
12 Correct Mass Balance of Resource Hybrid allocation scheme: Economic for process-emissions and upstream Physical where mass balance required (resource) 23 Correct Mass Balance of Resource Representation in ecoinvent 24
13 Conclusion & Outlook Coupled metal resources: integrated LCI model needed Interconnection of primary, by-product and secondary production! Many choices for allocation and system-model together with stakeholder? Aim: Harmonisation within whole metal sector 25 Results - Overview Indicator results range over five orders of magnitude eco-indicator 99, (H,A) per kg metal precious metals alloys base metals light metals Ferro & steel alloying met. speciality metals Alloys Lead supply Lead primary Lead secondary Cadmium Copper supply Copper coproduct Copper primary Copper secondary Nickel supply Nickel coproduct Nickel secondary Mercury Tin Zink coproduct Zink coproduct Chromium Cobalt Iron Manganese Aluminium supply Aluminium primary Aluminium secondary Lithium Magnesium Silica Silver Silver secondary Gold supply Gold primary gold secondary Palladium Palladium primary Palladium secondary Platinum supply Platinum primary Platinum secondary Rhodium supply Rhodium primary Rhodium secondary Semiconductor Indium Misc hmet all Molybdenum Tantalum 26
14 Results - Light and ferrous Metals 2.5 eco-indicator 99, (H,A) Chromium Cobalt Iron Manganese Aluminium supply Aluminium primary Aluminium secondary Lithium Magnesium Silica 27 Results - Precious and speciality M. 28
15 Results - Base Metals 7 eco-indicator 99, (H,A) Lead supply Lead primary Lead secondary Cadmium Copper supply Copper coproduct Copper primary Copper secondary Nickel supply Nickel coproduct Nickel secondary Mercury Tin Zink coproduct Zink coproduct Chromium Cobalt Iron Manganese 29 Changes with v2.0 cases Indicator Changes from v1.3 to v2.0, 64 metal datasets < lower eco-indicator (HA) higher > CED IPPC 10 UBP % -10% -5% -1% 0% 1% 5% 10% 15% more 30
16 Changes with v2.0 Due to Changes in background data Correction of errors Generally IPCC higher (5-10 %) Specifically SXEW Copper plus 10-30%: changed background data? Lead minus 30-80%: introduction of secondary metal EAF steel: minus 15-25% BOF steel: minus 25% Tox (UBP, eco-indicator), plus 20% energy related (IPCC, CED) 31 Thank you!
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