Nature of molybdenum
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- Category: Molybdenum knowledge
- Published on 17 July 2014
- Written by ling
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Molybdenum are silver-white metal, hard and tough, is one of the hard refractory metal element in the periodic table of the elements of group VI B, atomic number 42, atomic weight 95.94, density of 10.2 g / cm 3, melting point 2610 ℃, boiling point 5560 ℃ . Valence of +2, +4 and +6 +6 price stability. The first ionization energy of 7.099 eV. Air at ambient temperature without erosion. Not react with hydrochloric acid or hydrofluoric acid. Molybdenum has never appeared in a state of natural elements, but always combined with other elements. Molybdenum is a pro-sulfur, so molybdenite (MoS2) is the main mode of occurrence of molybdenum, followed by molybdenum and tungsten, copper, vanadium, rhenium, niobium oxide mineral elements such as symbiotic. Molybdenum currently known about 20 kinds of minerals, but only four have industrial applications: that molybdenite (MoS 2), calcium molybdate mine (CaMoO4), Mo Hua [Fe2 (MoO4) 3 · 71/2H2 O] and molybdate galena (PbMoO4). except molybdenite native molybdenum minerals, other secondary molybdenum minerals or are associated (commensal) molybdenum minerals. Molybdenum in air at ambient temperature or water is stable, but slight oxidation start temperature reaches 400 ℃, then after reaching 600 ℃ generated intense oxidized MoO3. Hydrochloric acid, hydrofluoric acid, nitric acid and dilute alkali solution for molybdenum were ineffective. Molybdenum can be dissolved in nitric acid, sulfuric acid or hot aqua regia solution. Molybdenum at high temperatures do not react with each other hydrogen, but at 1500 ℃ react with nitrogen to form a molybdenum nitride. 1100 ~ 1200 ℃ above with carbon monoxide and hydrocarbons such as the reaction of carbides MoSi2, MoSi2 this even in an oxidizing atmosphere in the 1500 ~ 1700 ℃ still quite stable and will not be oxidized and decomposed.
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