Basic metals refer to commonly used metals that are relatively used in various aspects of the national economy and society and have a wide range of applications. They generally include iron, manganese, copper, aluminum, lead, zinc, and tin. In our country, its annual consumption is hundreds of millions of tons of iron, millions of tons of manganese, copper and aluminum, hundreds of thousands of tons of lead and zinc, and the largest amount of other metals is about 100,000 tons, and generally a few thousand tons to tens of thousands of tons. , The least precious metals such as gold and platinum are only a few hundred tons. The above is divided according to the scope of use and usage of basic metals