中国铜循环的熵分析

为确定铜循环过程中含铜物质的聚集和散失程度,将热力学中"熵"这一指标引入到物流分析中,给出了物流分析中"熵"的分布及其计算方法.在中国2002年铜循环现状分析的基础上,计算了铜循环整个过程中,即精炼铜的生产阶段、铜制品的加工制造阶段、铜制品的使用阶段和报废铜制品的回收阶段熵的变化,得到5个节点处的相对熵值分别为0.32149,0.06337,0.23946,0.59919和0.50786,整个过程中的相对熵变化率为57.97%,即含铜物质趋于分散,且较严重.提出了减少采/选矿环节、熔炼环节尾矿和熔渣中铜的损失量,提高报废铜制品的回收率等措施,将会有效地降低铜循环的熵值增加.

Entropy Analysis of Copper Cycle for China

To ascertain the levels of aggregation and dissipation of cupric materials in copper cycle,the index of entropy in thermodynamics is introduced into material flow analysis to give the distribution and calculating method of entropy.The variation of entropy in the whole copper cycle is calculated involving 4 phases,i.e.,copper refining,products processing/manufacturing,utilization of products and recycling of abandoned products,based on the analysis of copper cycle in China in 2002.The values of relative entropy at the five respective nodes in the copper cycle are 0.321 49,0.063 37,0.239 46,0.599 19 and 0.507 86.The rate of change of relative entropy in the whole process is 57.97% which means that the cupric materials tend to serious dissipation.Some measures are suggested to take to decrease the loss rates of different links in the whole copper cycle,including are mining,dressing,smelting and tailing/slag disposed,so as to improve the recycling rate of abandoned copper products and lower effectively the increment of entropy in copper cycle.