Copper in non-ferrous metals is one of the metal materials used by human beings. Modern non-ferrous metals and their alloys have become indispensable structural and functional materials in machinery manufacturing, construction, electronics industry, aerospace, nuclear energy utilization and other fields.

In practical applications, non-ferrous metals are usually divided into five categories:

① Light metal

Density is less than 4500 kg/cubic meter (0.53 ~ 4.5g/cm3), such as aluminum, magnesium, potassium, sodium, calcium, strontium, barium, etc.

② Heavy metals

Density greater than 4500 kg/cubic meter (4.5g/cm3), such as copper, nickel, cobalt, lead, zinc, tin, antimony, bismuth, cadmium, mercury, etc.

③ Precious metals

The price is more expensive than common metals, the crust abundance is low, the purification is difficult, and the chemical properties are stable, such as gold, silver and platinum group metals.

④ semi-metal

Properties between metal and non-metal, such as silicon, selenium, tellurium, arsenic, boron, etc.

⑤ Rare metals

Including rare light metals, such as lithium, rubidium, cesium, etc.

Rare refractory metals, such as titanium, zirconium, molybdenum, tungsten, etc.

Rare dispersed metals, such as gallium, indium, germanium, etc.;

Rare earth metals, such as scandium, yttrium, lanthanide metals;

Radioactive metals such as radium, francium, polonium, and uranium and thorium in the alkene elements.