電気銅生産システムにおけるCO_2排出のライフサイクルインベントリ分析

概要

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CO2 emissions from the electrolytic copper production system were quantitatively evaluated using Life Cycle Assessment (LCA) technique. Electrolytic copper and sulfuric acid originated from the refining gas were produced in this system. In this study, inventories such as the fuel consumption of the unit processes and the in-house electricity were based on published papers and public statistical data. The following observations were made based on LCI analysis: (1) CO2 emissions from the electrolytic copper and sulfuric acid in the system are about 1.0kg and 0.4 kg / kg-product, respectively. The CO2 emissions attributable to the transportation of copper concentrate correspond to 20 % of all emissions. This emission is higher than that of zinc, because the metal content in the concentrate is lower than zinc. (2) The CO2 emissions from the system decrease with the recycling of copper scrap to the converter process, because the consumption of copper concentrate is reduced. The reduction is estimated to be 0.2 kg-CO2 / kg-Cu at the point of 0.1 kg / kg-blister Cu with scrap additive. This corresponds to 9 % reduction for the present system. However, recycling leads to the decrease of sulfuric acid by 450 kt at the point. As a result, the recycling of scrap should be evaluated not only from the reduction of CO2 emissions but also in terms of sulfuric acid demands.
社団法人資源・素材学会の論文
2001-01-25