non ferrous metals uses

A: non-ferrous metals in copper is the earliest human use of metal materials. Modern, non-ferrous metals
Color metal and its alloys have become the machinery manufacturing, construction, electronics, aerospace, nuclear energy and other essential areas of structural materials and functional materials.
B: practical applications, usually non-ferrous metals are divided into five categories:
1 light metal. Density less than 4500 kg / cubic meter, such as aluminum, magnesium, potassium, sodium, calcium, strontium, barium, etc.
 2 heavy metals. Density greater than 4500 kg / m 3, such as copper, nickel, cobalt, lead, zinc, tin, antimony, bismuth, cadmium, mercury, etc.
3 precious metals. Expensive than commonly used metal prices, low crustal abundance, purification difficulties, such as gold, silver and platinum group metals.
4 semi-metal. Nature of the price between the metal and nonmetal, such as silicon, selenium, tellurium, arsenic, boron and so on.
5 rare metals. Including the rare light metal, such as lithium, rubidium, cesium, etc.;
Rare and refractory metals such as titanium, zirconium, molybdenum, tungsten, etc.;
Rare and dispersed metals such as gallium, indium, germanium, thallium, etc.;
Rare earth metals such as scandium, yttrium, lanthanide metal;
Radioactive metals such as radium, francium, and the A line element polonium in uranium, thorium, etc.
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