Molybdenum metal distribution, preparation, basic properties and related several important alloys, as well as important rare metals in metal smelting, detection, aerospace, medicine, agriculture, catalysts, ceramics and other fields of the important role and impact, finally introduced the development prospects of molybdenum metal metal.
Basic introduction of molybdenum metal metal molybdenum metal is the Vib family element in the periodic table, atomic number 42, atomic weight 95. $number。 Density 10.2 grams/cubic centimeter. Melting Point 2,610 ℃. Boiling 5,560 ℃. Valence + 2, +4 and +6, stable price of +6. Molybdenum metal is a kind of transition element, it is very easy to change its oxidation state, Molybdenum Metals which plays the role of electron transfer in the redox reaction in vivo. In the form of oxidation, molybdenum metal is likely to be in a +6 valence state. Although it is likely to revert to a +5-valence state at the time of the electron transfer, Molybdenum Metals other oxidation states of molybdenum metals have also been found in the reduced enzymes. Molybdenum metal is the component of xanthine oxidase/dehydrogenase, aldehyde oxidase and sulfite oxidase, so it is known as the essential trace element of human body and animal and plant.
The distribution of molybdenum metal metals in China has been proved to be rich in rare metals resources, large scale. Molybdenum metal, rare earth, titanium, Molybdenum Metals Tungsten ranked first in the world. According to the U.S. Geological Survey estimates, 2007 China's rare earth burial capacity of about 27 million tons, the amount of tungsten buried about 1.8 million tons, molybdenum metal burial capacity of about 3.3 million tons, titanium burial capacity of about 200 million tons. Molybdenum Metals Among them, molybdenum metal in China's largest reserves in the world, Shaanxi province Hua County Gold heap town, Liaoning Huludao, Jilin, Shanxi, Henan, Fujian, Guangdong, Hunan, Sichuan, Jiangxi, Gansu and other provinces have molybdenum metal ore, and reserves, good development conditions, production in the country occupies an important position. Molybdenum metal minerals with industrial value are mainly the Hui-mo metal ore, and about 99% of molybdenum metal ore is mined in the state of Hui Mo Metal Ore.
The high melting point and high boiling point of molybdenum metal is one of the notable characteristics of molybdenum metal, its melting point is 2 620 ℃, second only to carbon, tungsten, rhenium, tantalum and osmium, boiling point is 5 560 ℃. At 20 ℃, the density of molybdenum metal is 10. CM, only about 1/2 of tungsten. Molybdenum Metals The linear expansion coefficient of molybdenum metal is 5. 8-6. 2) x10~, just general steel $number, similar to silicon dioxide, low line expansion coefficient makes molybdenum metal in the high temperature size stability, reduce the risk of rupture. The thermal conductivity of molybdenum metals is several times higher than that of many high-temperature alloys, about 1/2 of copper. The conductivity of molybdenum metal is higher, about 1/3 of copper, Molybdenum Metals and decreases with the increase of temperature. Molybdenum metal has a high modulus of elasticity, is one of the highest modulus of elasticity in industry, and is less affected by temperature, even in 800 ℃ is still higher than ordinary steel
Values at room temperature. The small heat neutron capture surface is also one of the important properties of molybdenum metal, which enables molybdenum metal to be used in the structural materials of the nuclear Reactor center. Molybdenum metal elongation is better than tungsten, Molybdenum Metals can be processed into a very thin foil and very fine silk material
The chemical properties of molybdenum metal metal molybdenum metal has 2 of electrons that are not filled with electronic layer, n-layer and 0-layer, Molybdenum Metals so that the structure of molybdenum metal has a variety of chemical valence states, can form a wide range of compounds. The chemical properties of molybdenum metal in air at ambient temperature are very stable and will not be hydrochloric acid, hydrofluoric acid, lye corrosion, but can dissolve in concentrated sulfuric acid, nitric acid and aqua regia; When the temperature reaches 400 ℃, Molybdenum Metals it will be slightly oxidized, the molybdenum metal metal can be oxidized to molybdenum trioxide when the ℃ is higher than 600, and the molybdenum metal will be oxidized by water vapor when it is higher than 700 ℃.