铅是一种柔软的重金属,是最防腐蚀的普通金属,也是人类使用最早的金属之一。铅在世界上每年的用量仅次于铝、铜、锌。锌的生产历史比较悠久,由于锌的沸点低冶炼时容易挥发,并且易被空气氧化,所以金属锌很难获得,因此,锌工业的发展比铜,铅、铁等金属工业慢得多。铅和锌在自然界中同属比重较大的元素,常赋存于多金属硫化矿床中,几乎是“同胞”共生,被称为自然界中的一对“胞兄弟”。因此,到目前为止,世界上还没有发现单独的铅 Lead is a soft, heavy metal, the most corrosion-resistant common metal, and one of the earliest metals used by humans. Lead in the world every year after the amount of aluminum, copper, zinc. Zinc has a long history of production. Due to the low boiling point of zinc, it is easy to volatilize when smelting and easy to be oxidized by air. Therefore, the zinc metal is hard to obtain. Therefore, the development of zinc industry is much slower than that of the metal industry such as copper, lead and iron. Both lead and zinc belong to the heavier elements in nature and are often found in polymetallic sulphide deposits. They are almost “symbiotic” symbioses and are called “twin brothers” in nature. So far, no single lead has been found in the world