Properties of Metal Molybdenum: silvery white metal, hard and tough, is difficult to one of the metal elements in the periodic table of elements, VIB elements, atomic number 42, atomic weight 95.94, density 10.2 g / cm 3, melting point 2610 ℃, 5560 ℃boiling point. Combining +2, +4 and +6, stable price of +6. The first ionization energy of 7.099 electron volts. Not subject toerosion in air at room temperature. With hydrochloric acid orhydrofluoric acid does not react. Mo never to natural elementsstate, but always with other elements together. Molybdenum is achalcophile elements, so the molybdenite (MoS2) is the mainoccurrence state of molybdenum, followed by the oxide ore of molybdenum and tungsten, copper, vanadium, niobium and other elements of rhenium, symbiosis. The molybdenum minerals known to about 20 a variety of, but which has industrial application valueof only four kinds: namely the molybdenite (MoS2), calcium molybdate ore (CaMoO4), Mo Hua [Fe2 (MoO4) 3 · 71/2H2O] andwulfenite (PbMoO4). Except for the primary molybdenum mineralmolybdenite, the other is secondary molybdenum mineral orassociated (symbiotic) molybdenum mineral. At room temperature,molybdenum is stable in air and in water, but when the temperature reached 400 ℃ begins to slight oxidation, when up to 600 ℃ after severe oxidation and generation MoO3. Hydrochloric acid, hydrofluoric acid, nitric acid and alkali solution onmolybdenum had no any effect. Molybdenum is soluble in nitric acid, aqua regia or hot sulfuric acid solution. At very high temperature molybdenum hydrogen does not react with each other, but react to form molybdenum nitride at 1500 DEG C and n.In 1100 ~ 1200 ℃ and carbon, carbon monoxide and hydrocarbons reaction of carbides such as MoSi2, the MoSi2 even at 1500 ~ 1700 ℃ in oxidizing atmosphere is quite stable, will not be oxidation decomposition.
Applications: alloy steel, stainless steel, tool steel and cast iron isthe main field of application of molybdenum, its productiondetermines the demand for molybdenum, molybdenum in thefollowing role in iron and steel:
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