A: Copper in non-ferrous metals is one of the earliest metal materials used by humans. Modern, non-ferrous metals and their alloys have become indispensable structural materials and functional materials in the fields of machinery manufacturing, construction, electronics, aerospace and nuclear energy utilization.
B: In practical applications, non-ferrous metals are usually divided into five categories:
1. Light metal.
The density is less than 4500 kg / cubic meter, such as aluminum, magnesium, potassium, sodium, calcium, barium, strontium and the like.
2. Heavy metals.
The density is more than 4500 kg / cubic meter, such as copper, nickel, cobalt, lead, zinc, tin, antimony, bismuth, cadmium, mercury and the like.
3. Precious metals.
The price is more expensive than common metals, the abundance of the crust is low, and the purification is difficult, such as gold, silver and platinum group metals.
Non-ferrous metal
4. Semi-metal.
The property is between metal and non-metal, such as silicon, selenium, tellurium, arsenic, boron, and the like.
5. Rare metals.
Including rare light metals such as lithium, cesium, cesium, etc.;
Non-ferrous metal
Rare refractory metals such as titanium, zirconium, molybdenum, tungsten, etc.;
Rarely dispersed metals such as gallium, indium, antimony, antimony, etc.;
Rare earth metals such as lanthanum, cerium and lanthanide metals;
Radioactive metals such as uranium and thorium in radium, thorium, thorium and alkaloid elements.
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