素材ストックの成長率が低減していく場合の素材リサイクルシステムの解析と鉄鋼への適用

抄録

Recycling of various materials has been urged worldwide for environmental reasons. Promotion of recycling is expected to reduce the environmental pollution caused by material production. However, recycling of materials leads to increase in concentration of impurities in the material, which usually lowers social utility of the use of the material. Therefore, establishment of analyzing methods of the whole recycling system is needed to evaluate the effect of recycling totally.
In this study, we proposed an analytical model for recycling system and developed formulas for the comprehensive evaluation of recycling system, assuming that the stock of materials in our society will continue to increase but will converge to a certain level.
Our proposed method can be used for forecast and evaluation of material production, recycling ratio, concentration of impurities, environmental load, etc.
By applying this model to iron and steel materials, quantitative trade-off relation between the improvement of environment and deterioration of the quality by copper accumulation was made clear.