Molybdenum ore identification
In metallurgical industry, molybdenum is used as additive for the production of various alloy steels, or with tungsten, nickel, cobalt, zirconium, titanium, vanadium, rhenium and other advanced alloys to improve its high temperature strength, wear resistance and corrosion resistance. Molybdenum-containing alloy steel is used to manufacture transport devices, locomotives, industrial machinery, and various instruments. Some stainless steels containing 4% molybdenum and 5% molybdenum are used in the production of precision chemical instruments and equipment for use in seawater environments. High-speed cutting tools can be manufactured with high speed steel containing 4% or 9. 5%. Molybdenum and nickel and chromium alloys are used to manufacture metal components for aircraft, corrosion resistant parts for locomotives and automobiles. Molybdenum and tungsten, chromium, vanadium alloys are used to manufacture alloy components and components for warships, tanks, guns, rockets, satellites. Molybdenum is widely used as heating material and structural material of high temperature electric furnace, large electrode and gate of vacuum tube, semiconductor and electric light source material. Molybdenum can also be used as structural material for nuclear reactors because of its small thermal neutron capture cross section and high rupture strength. In the chemical industry, molybdenum is mainly used in lubricants, catalysts and pigments. Molybdenum disulfide has good lubricating properties under high temperature and high pressure because of its lamellar crystal structure and surface chemical properties. It is widely used as additive for oil and oil. Molybdenum is a catalyst component in hydrogen desulfurization and other petroleum refining processes, which is used in the redox reactions of ethanol, formaldehyde and oil-based chemicals. Molybdenum orange is an important pigment. Molybdenum chemicals are widely used in dyestuffs, inks, colored precipitated dyes, and anticorrosive primer. Molybdenum compounds are also widely used in agricultural fertilizers. The elemental abundance of molybdenum in the crust is about 1 × 10 ~ (-6), and that of granite is the highest (2 × 10 ~ (-6) in magmatic rocks. Molybdenum is a transitional ferric element in geochemical classification. Molybdenum is mainly combined with sulfur to form molybdenum in endogenetic mineralization. Molybdenum (MoS2) is the most widely distributed molybdenum mineral with practical industrial value among more than 30 molybdenum minerals known in nature. Other common molybdenum bearing minerals are ferromolybdenum ([Fe3 (MoO4) 8 8H2O], calcium molybdate (CaMoO4), colored molybdenum lead (PbMoO4), colloidal molybdenum (MoS2), blue molybdenum (Mo3O8 nH2O), etc. There are polytypes in molybdenum, and the formation temperature of 2H type molybdenum is higher than that of 3R type molybdenum. The amorphous MoS2 colloid MoS2 3MoS2 2HMoS2 was formed from low to high temperature. The temperature measurement data show that molybdenum formation temperature has a wide range, from relatively high temperature to relatively low temperature, and a large number of molybdenum is formed at the high to medium temperature stage. Under the action of hydrothermal solution, MoS2 precipitates in acidic condition, that is, molybdenum is most stable in acidic condition. When the solution turns neutral, molybdenum becomes soluble thiomolybdate and molybdate and reactivates. Under the conditions of low temperature and normal temperature, Mo4 produces molybdenum colloidal sulfide (MoS2) in a strong acidic reduction environment, and its oxidized product is blue molybdenum (Mo3O8 nH2O). In exogenous action, molybdenum is Mo6 with strong activity. Similar to uranium, it is stable in a transition environment of redox and reduction near neutral or partial alkalinity, resulting in a variety of uranium bearing molybdate minerals, such as molybdenum uranium ore [(UO2) MoO4 4H2O], Ca (UO2) 3 (MoO4) (OH) 2 11H2O) et al. Fe2 (MoO4) 3 nH2O is a common mineral formed from sulphide ores under acidic conditions (pH=3~5). Colored molybdenum lead ore is the product of molybdenum-bearing lead-zinc ore under neutral conditions. The ionic radius of rhenium and molybdenum is similar, so it is often replaced by molybdenum and enriched in molybdenum, which is the main source of rhenium for industrial use. The content of rhenium in molybdenum is usually related to the content of 3R type in molybdenum and the content of rhenium in ore-forming solution.
