英文名称：Secondary metals 中文名称：二级金属产品／次级金属产品
"与从矿石中提炼的初级金属产品不同，指从金属废料或合金中提炼出来的金属。参见初级金属产品。
e.g. China's output of copper and aluminum products reached 2.83 million tons and 5.5 million tons respectively in the first five months of this year, an increase of 23.6 percent and 40.4 percent year on year, respectively, according to statistics from the 8th International Forum on secondary metals."
