Abstract
Life cycle inventory analyses for Pb solder and Pb-free solder were conducted to evaluate CO2 emissions during the life cycle of the solders. CO2 emissions in material production, waste treatment and recycling of Pb solder and Pb-free solder were calculated and quantified. In the case of recycling, effective recycle rate and CO2 emission intensities of solders at the recycle rate were investigated. Life cycle CO2 emissions of Pb solder were larger than those of Pb-free solders due to large energy consumption required for rigid waste treatment (Pb solder: 83.0, Pb-free solder: 2.88 (kg-CO2Ikg-solder)). In the case of recycle system, it was found that the total CO2 emissions of Pb-free solders were smaller than those of Pb solder (Pb solder: 18.3, Pb-free solder:2.88 (kg-CO2/kg-solder)). It was concluded that Pb-free solder has superiority to Pb solder in the view point of life cycle CO2 emissions.
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