Molybdenum is a relatively late discovery of a metal element, in 1792 by the Swedish chemists from the molybdenum ore extracted. As the molybdenum metal with high strength, high melting point, corrosion resistance, wear-resistant research, etc., so in the industry has been widely used.
Molybdenum is mainly used in steelmaking industry, can improve the strength of steel, hardness and corrosion resistance; molybdenum alloy heat, corrosion resistance, can be used for aerospace, rocket and nuclear industry heat-resistant parts: molybdenum metal in the electronics industry can be produced Large-scale electrodes and gates, as well as amplifiers, various components of the launch tube; molybdenum trioxide in the chemical industry and the petroleum industry as a catalyst; molybdate can be used as pigments and dyes, Molybdenum Metals added to the enamel can be enamel and steel Solid; molybdenum dioxide can be used as a solid lubricant.
In the metallurgical industry, molybdenum as the production of various alloy steel additives, or with tungsten, nickel, cobalt, zirconium, titanium, vanadium, Molybdenum Metals rhenium and other senior alloy composition to improve its high temperature strength, wear resistance and corrosion resistance. Molybdenum alloy steel used to manufacture transport equipment, locomotives, industrial machinery, and a variety of instruments. Molybdenum Metals Some molybdenum containing 4% to 5% stainless steel for the production of precision chemical instruments and equipment used in seawater environment. Contains 4% to 9.5% high speed steel to manufacture high speed cutting tools. Molybdenum and nickel, chromium alloys are used to make metal parts for aircraft, corrosion parts on locomotives and cars. Molybdenum and tungsten, chrome and vanadium alloys are used in the manufacture of warships, tanks, guns, rockets, satellite alloy components and components.
Molybdenum metal used as a high-temperature electric furnace heating materials and structural materials, vacuum tube of large electrodes and gate, Molybdenum Metals semiconductor and electric light source materials. Due to the thermal neutron trapping of molybdenum and a high lasting strength, but also can be used as nuclear reactor structural materials.
In the chemical industry, molybdenum is mainly used for lubricants, catalysts and pigments. Molybdenum disulfide because of its lamellar crystal structure and its surface chemical properties, high temperature and pressure in a good lubrication performance, widely used as oil and grease additives. Molybdenum is a hydrogen desulfurization process and other catalyst components in the refining process for the production of ethanol, Molybdenum Metals formaldehyde and oil-based chemicals in the redox reaction. Molybdenum orange is an important pigment pigment. Molybdenum chemicals are widely used in dyes, inks, color precipitated dyes, and antiseptic primers.
Molybdenum compounds also have a wide range of uses in agricultural fertilizers.
First, the characteristics of molybdenum ore raw materials
Molybdenum in the crust in the element abundance of about 1 × 10-6, in the magmatic rock granite molybdenum up to 2 × 10-6. Molybdenum in the geochemical classification, belonging to the transitional iron element. In the role of endogenous mineralization, molybdenum mainly combined with sulfur to produce molybdenite.
Molybdenite (MoS2) is known in the nature of more than 30 kinds of molybdenum minerals in the most widely distributed and has practical industrial value of molybdenum minerals. (FeMOO), molybdenum molybdenum (MoM2), molybdenum molybdenum (MoS2), molybdenum (molybdenum) Ore (Mo3O8 · nH2O) and so on.
There are many types of molybdenite in the molybdenum deposit. The experimental results show that the appearance of the molybdenite is related to the formation temperature, and the molybdenite formation in the 2H type is higher than that of the 3R type molybdenite. The temperature from low to high formation of amorphous MoS2 → colloidal MoS2 → 3MoS2 → 2HMoS2. The temperature profile shows that the molybdenum formation temperature has a wide range, from a relatively high temperature until a relatively low temperature, Molybdenum Metals and a large number of high to medium temperature stage. Under the action of hydrothermal, MoS2 precipitates under acidic conditions, that is, molybdenite is most stable under acidic conditions. When the solution turns neutral, molybdenum becomes soluble thiogalonate and molybdate and reacts again The At low temperature and room temperature, Mo4 + is formed into MoS2 in strong acid reduction environment. The product after oxidation is molybdenite (Mo3O8 · nH2O). Exogenous role, molybdenum was Mo6 +, with a strong activity. Molybdenum Metals It is similar to uranium and is stable in a transitional environment close to neutral or alkaline oxidation and reduction, thereby producing a variety of molybdenum-containing molybdenum minerals, such as molybdenum uranium [(UO2) MoO4.4H2O], molybdenum Calcium uranium [Ca (UO2) 3 (MoO4) · (OH) 2 · 11H2O]. Fe2 (MoO4) 3 · nH2O] is a common mineral formed by sulfide ore under acidic conditions (pH = 3 ~ 5). The molybdenum lead is a product of molybdenum-containing lead-zinc ore under neutral conditions.
Rhenium and molybdenum ion radius is similar, it is often replaced molybdenum and enrichment in molybdenum ore, as the main source of industrial rhenium. The content of rhenium in molybdenite is related to the content of 3R in molybdenite and the rhenium content in mineralization solution.