Heavy metal

General density above 4.5g/cm3, such as copper, lead, zinc, etc.;

Light metal

Low density (0.53 ~ 4.5g/cm3), active chemical properties, such as aluminum, magnesium and so on.

Precious metal

The content of the crust is small, extraction is difficult, the price is high, the density is high, and the chemical properties are stable, such as gold, silver, platinum, etc.;

Rare metal

Such as tungsten, molybdenum, tantalum, lithium, thorium, uranium and so on.

Non-ferrous metals are all metals except the three metals: iron, chromium, and manganese. In 1958, China listed iron, chromium and manganese as ferrous metals, and 64 metals other than iron, chromium and manganese were included in non-ferrous metals. The 64 non-ferrous metals include: Aluminum

, magnesium, potassium, sodium, calcium, strontium, barium, copper, lead, zinc, tin, cobalt, nickel, antimony, mercury, cadmium, bismuth, gold, silver, platinum, rhodium, iridium, palladium, rhodium, iridium, ruthenium Lithium, tantalum, niobium, titanium, zirconium, hafnium, vanadium, niobium, tantalum, tungsten, molybdenum, tantalum, indium, niobium, tantalum, niobium, hafnium, tantalum, niobium, tantalum, niobium, tantalum, hafnium, ytterbium , Niobium, Niobium, Tantalum, Niobium, Tantalum, Niobium, Tantalum, Silicon, Boron, Selenium, Tellurium, Arsenic, Antimony.