期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 22, 期 7, 页码 1744-1752出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(11)61382-4
关键词
social stock; secondary resource; average use life; recyclable ratio; average age
资金
- National Natural Science Foundation of China [71003018]
- Fundamental Research Funds for the Central Universities, China [N110402003]
Social stock for metal determines secondary or recoverable resources to a certain extent. Top-down analysis method for the studying of metal in social stock was given. Influences of metal consumption under three circumstances, that is keeping constant, varying in a linear trend and in an exponential trend, on one kind of metal's social stock, recyclable ratio and average age were analyzed. Al-contents and Cu-contents in social stock for China during the period 2006-2009 were calculated. The results reveal that Al-contents and Cu-contents in social stock kept increasing and reached 88.9 million tons and 51.4 millions tons in 2009, respectively, their average recyclable ratios are 1.45% and 0.30%, and the average ages are 4.65 years and 6.89 years, respectively. The recyclable ratios and average ages of Al-contents and Cu-contents in social stock will rise in future along with the decline of the increasing rate of aluminum consumption and copper consumption.
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