(1) Non-ferrous metals
There are many kinds of metals, which are usually divided into ferrous metals and non-ferrous metals. Ferrous metals include iron, manganese, chromium and their alloys. Eighty-three metals other than iron, manganese and chromium are called non-ferrous metals. The classification of non-ferrous metals is not completely unified in various countries. Roughly according to its specific gravity, price, reserves and distribution in the earth's crust, was found and used sooner or later, etc., it is divided into five categories: 1) light colored gold; 2) Heavy non-ferrous metals; 3) Rare metals; 4) Precious metals; 5) Semi-metal.
(2) Ten non-ferrous metals
Ten kinds of non-ferrous metals refer to ten kinds of metals with large production and wide application in non-ferrous metals, also known as ten kinds of commonly used non-ferrous metals. The production of non-ferrous metals in the world generally refers to the total production of ten non-ferrous metals: aluminum, magnesium, copper, lead, zinc, nickel, cobalt, tin, antimony and mercury. China's ten kinds of non-ferrous metals generally refer to: copper, aluminum, nickel, lead, zinc, tungsten, molybdenum, tin, antimony, mercury ten kinds, that is, the foreign magnesium and drill into tungsten and molybdenum. The 109 elements that make up nature are divided into metallic elements, semi-metallic elements, non-metallic elements and gaseous elements. There are 81 kinds of metal elements. Metallic elements are divided into ferrous metals and non-ferrous metals.
According to the nature of the elements, the abundance in the earth crust and the use of non-ferrous metals are divided into non-ferrous heavy metals, non-ferrous light metals, precious metals, rare light metals, rare high melting point metals, rare metals, rare earth metals, natural radioactive metal elements and artificial radioactive metal elements, etc. Precious metal elements are: osmium (Os), iridium (Ir), ruthenium (Ru), rhodium (Rh), platinum (Pt) and palladium (Pd), gold (Au), silver (Ag). In addition to jewelry, precious metals are also widely used in electronic products and special alloys.
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