Copper was one of the first metals discovered and used by humans. About 10,000 years ago, humans recognized natural copper and hammered it into small cones or nails. So far found the earliest human refining of copper when push the Iranian territory of Tepe Haiya excavated scraper, chisel and awl, etc., the age of about 3800 B.C. In 1978 in Gansu Province, Dongxiang Majiayao type site unearthed Chemicalbook tin bronze knife, is so far the earliest bronze pieces found in China, and the age of its about 2750 B.C., which shows that China is one of the earliest countries in the world to use copper. Bronze. China mastered the technology of vertical furnace copper refining as early as 770 BC, and the copper output reached 7300t in the first year of Yuanfeng of Song Dynasty (1078), so the copper metallurgy technology had reached a considerable level.
