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The metal products industry consists of structural metal products, metal tools, containers and metal packaging containers, stainless steel and similar daily-use metal products. With the progress of society and the development of science and technology, metal products are used more and more widely in industry, agriculture and people's life. They also create more and more value for society.
Definition of the metal industry
According to Yu Bo industry Market Research Center released the 2013-2018 China ferrous metal mining industry industry Market Research Report Analysis of metal is a glossy, malleable, easy conductive properties of substances. All of the above properties of metals are related to the free electrons in the metal crystals. In nature, most metals exist in a compound state, and a few metals, such as gold, platinum, silver and bismuth, exist in free form. Most of the metal minerals are oxides and sulfides. Other forms of existence are chlorides, sulfates, carbonates, and silicates. The bond between the metals is the metal key, so that the position can be replaced at will, which is also why the metal is well stretched. A metallic element usually only shows a positive valence in a compound. Relatively large molecular weight is called heavy metal.
Major categories of metals industry
Ferrous metals: iron, chromium, manganese, three kinds.
Nonferrous metal: aluminum, magnesium, lutetium, yttrium, scandium and thorium.
Common metals: such as iron, aluminum, copper, zinc and so on.
Rare metals: such as zirconium, hafnium, niobium, tantalum and so on.
Light metals: density less than 4500 kg / cubic meter, such as titanium, aluminum, magnesium, potassium, sodium, calcium, strontium, barium and so on.
Heavy metals: density greater than 4500 kg / cubic meter, such as copper, nickel, cobalt, lead, zinc, tin, antimony, bismuth, cadmium, mercury and so on.
Precious metals: price than ordinary metal expensive, low crustal abundance (also known as Clark (CLARKE value), a numerical representation of the average content of chemical elements in the earth's crust), difficult purification, such as gold, silver and platinum metals.
Quasi metallic elements: properties between metals and nonmetals, such as silicon, selenium, tellurium, arsenic, boron, etc..
Rare metals: including rare light metals such as lithium, rubidium, cesium, etc.;
Rare refractory metals: such as zirconium, molybdenum, tungsten and so on;
Rare scattered metals: such as gallium, indium, germanium, thallium, etc.;
Rare earth metals such as scandium, yttrium, and lanthanide metals;
Radioactive metal: such as radium and polonium, francium and actinides in uranium and thorium.