Copper
in twentieth Century 90 "s, the copper smelting in China is mainly based on the domestic market, the import of scrap copper is little or no import. However, as copper resources are relatively poor countries, China and copper consuming country, with the development of industry, China's copper reserves is decreasing year by year, can only rely on cost more and more high copper ore imports, which not only affects the copper in our country the development of the whole industry, is bound to cause long-term problems.