Zinc Sheet Environmental Profile - Life Cycle Assessment

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Cradle-to-Gate System Figure 2: Schematic illustration of the boundaries of the gate‐to‐gate and the cradle‐to‐gate systems of zinc sheet production Gate-to-Gate System Upstream Supplies Zinc Sheet Production at Site Input/Output Balance of the Production Site For zinc sheet production processes, IZA collected primary data from sites of its member companies using electronic questionnaires. Secondary data about background processes outside the operational control of IZA members (e.g. fuel and electricity, auxiliary materials, transportation) were obtained from the GaBi 4 life cycle database, literature and other industry expertise. The LCI dataset came from five sites collectively producing 255,000 tonnes per year of zinc sheet - representing more than 50% of global zinc sheet production in 2006. Study results Table 1 shows selected results for the production of zinc sheet on the basis of one 1m 2 zinc sheet/sheet thickness (0.7mm assumed) produced. These results are based on averaged data. The analysis of the zinc sheet production process undertaken for the LCI study shows that the resulting environmental burden is dominated by energy use during zinc sheet production at the sites. (Note: This statement refers only to the direct process inputs to produce the sheets.) This is also true for the LCI’s of most other metals. The energy source/composition of the electricity grid mix can significantly influence the associated environmental burdens. To improve the related environmental burden, increased energy efficiencies should be looked for where possible. A reduction in the scrap rate at the different process steps, particularly during rolling and slitting, would also help to reduce the environmental effects by minimizing the gross amount of zinc alloy material needed to produce a kilogram of zinc sheet. Readers are encouraged to access the LCI results this profile is based on to support studies analyzing the environmental burdens of zinc sheet applications. It is important to understand that the data set presented here represents averaged information on the industrial process of zinc sheet application. Selected LCI Parameters of Zinc Sheet Inventory Results per m 2 Unit Primary energy demand 266.5 MJ Non-renewable energy resources 229.1 MJ Renewable energy resources 37.6 MJ Carbon dioxide 16.02 kg Sulphur dioxide 0.05 kg Selected LCIA Parameters Based on Impact Inventory Results per m 2 Unit Methodology CML 2001 of Zinc Sheet Global Warming Potential (GWP 100 years) 16.47 kg CO 2 Equiv. Acidification Potential (AP) 0.12 kg SO 2 -Equiv. Eutrophication Potential (EP) [kg Phosphate-Equiv.] 1.196E-02 kg Phosphate-Equiv. Photochem. Ozone Creation Potential (POCP) 6.311E-03 kg Ethane-Equiv. Ozone Layer Depletion Potential (ODP, steady state) 1.817E-06 kg R11-Equiv. Table 1: Selected LCI parameters representing 1m 2 of zinc sheet production including the environmental burden of the consumed special high grade zinc 6 Zinc Sheet Environmental Profile Life Cycle Assessment
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Page 1 and 2: Zinc Sheet Environmental Profile Li
Page 3 and 4: What are the sustainability aspects
Page 5: How is LCA used? Typically LCA is u

Zinc Sheet Environmental Profile - Life Cycle Assessment

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