Industry news-Xincheng Molybdenum

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Physical and chemical properties of molybdenum

Physical property Molybdenum is located in the mendeleev periodic table of the fifth cycle, the first VIB, as a transition metal element, molybdenum atomic number 42, atomic weight of 95.95, in the atomic electron configuration: 1 s22s22p63s23p64s23d104p64d55s1. Due to the semi-full valence orbital state, molybdenum is in a typical transition state between lithophile elements (8 electron ion configuration) and cuprophilic elements (18 electron ion configuration). Goldschmidt called it siderophile in the geochemical classification of elements. Molybdenum has seven stable natural isotopes. Chemical property Molybdenum is extremely difficult to throw away seven or eight electrons. This determines the chemical properties of molybdenum are relatively stable. At room temperature or at not too high a temperature, molybdenum is stable in air or water. Molybdenum is heated in the air, and the color begins to turn from white (color) to dark gray; When the temperature rises to 520℃, molybdenum begins to be slowly oxidized to form Mo2O3. When the temperature rises above 600℃, molybdenum is rapidly oxidized to MoO3. Molybdenum is heated in water vapor to 700~800 ° C and begins to form MoO2, which is further heated and molybdenum dioxide is continued to be oxidized to molybdenum trioxide. Molybdenum can spontaneously ignite in pure oxygen to form molybdenum trioxide. Molybdenum oxides have been reported a lot, but many are reaction intermediates, rather than thermodynamically stable phase states. There are only nine that are very reliable.

2023

06-26

Molybdenum oxide for operational disposal storage

Operation precautions: closed operation, local exhaust. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that the operator wear a self-priming filter dust mask, chemical safety glasses, protective work clothes, and rubber gloves. Avoid producing dust. Avoid contact with acids. Light loading and unloading during handling to prevent packing damage. Equipped with leak emergency treatment equipment. Empty containers may have harmful residues. Storage precautions: Store in a cool, ventilated warehouse. Keep away from fire and heat. It should be stored separately from acids and edible chemicals, and should not be mixed. Storage areas should be equipped with suitable materials to contain leaks.

2023

06-26

The use of molybdenum oxide

It is mainly used for the determination of protein, phenol, arsenic, lead, bismuth, etc. It can also be used as a reducing agent for phosphorus pentoxide, arsenic trioxide, hydrogen peroxide, phenol and alcohol, and can also be used for the preparation of molybdenum salt and molybdenum alloy. In February 2023, researchers at the National Nanoscience Center constructed a heterostructure of graphene and molybdenum oxide van der Waals materials to realize a new type of electrically regulated photonic transistor.

2023

06-26

The use of ferric molybdenum

The largest application of ferro molybdenum is in the production of iron alloys, depending on the content and range of molybdenum, which is suitable for machine tools and equipment, military equipment, oil pipelines in refineries, load-bearing components and rotary exercises. Ferric molybdenum is also used in cars, trucks, locomotives, ships and so on. In addition, ferro molybdenum is used in stainless steel and heat-resistant steel is employed in synthetic fuel and chemical plants, heat exchangers, generators, oil refining equipment, pumps, turbine tubes, Marine thrusters, plastics and acids, and storage containers. Tool steel has a high proportion of ferro molybdenum in the range and is used for high speed mechanical workpieces, cold working tools, drills, screwdrivers, molds, chisels, heavy castings, balls and large drills for rolling mills, rolls, cylinder blocks, piston rings.

2023

06-26

Production of ferric molybdenum

Most of the global ferro molybdenum is supplied by China, the United States, Russia and Chile. The most basic definition of the ferric molybdenum production process is that molybdenum is first mined and then converted into molybdenum (vi) oxide MoO3, which becomes a mixed oxide with iron, aluminum oxide, and then reduced in the thermite reaction. Electron beam melting then purifies ferro molybdenum, or the product can be packaged as-is. Normally, ferro molybdenum alloy is produced in a fine powder, and ferro molybdenum is commonly shipped in bags or shipping steel drums.

2023

06-26

Properties of ferric molybdenum

Ferric molybdenum is an amorphous metal additive in the production process, which has several excellent properties that can be transferred to new alloys. One of the main benefits of ferro molybdenum alloy is its hardening performance, which makes the weldability of steel extremely strong, ferro molybdenum is one of the 5 high melting point metals in the country. In addition, increasing the alloy to ferro molybdenum can improve corrosion resistance. The characteristics of ferric molybdenum make it a protective film on other metals, suitable for a variety of products.

2023

06-26

Standard for the inspection of ferric molybdenum

(1) Quality inspection and acceptance. The quality inspection and acceptance of products shall comply with the requirements of GB/ T3650-95 "General Provisions for Ferroalloy acceptance, packaging, storage and transportation, marking and Quality Certificate". (2) Batch. When the products are delivered in a batch of one furnace or the supply and demand parties agree on a batch of furnaces, the difference between the highest or lowest molybdenum content in each batch of products and the average molybdenum content of the sample shall not exceed 3%. (3) Sampling. Samples for chemical analysis should be taken in accordance with GB/ T4010-94 "Sample Taking and Preparation for Chemical Analysis of Ferroalloys". (4) Sample preparation. The preparation of samples for chemical analysis is carried out according to GB/ T4010-94 "Sampling and Preparation of Samples for Chemical Analysis of Ferroalloys". (5) Chemical analysis methods. The corresponding elements are tested according to the following criteria: GB5059? Molybdenum content was determined by 1-85-8-hydroxyquinoline gravimetric method. Gb5059.2-85 malachite green spectrophotometric determination of antimony; Gb5059.3-85 atomic absorption spectrophotometry for the determination of copper content; Gb5059.4-88 polarographic determination of tin content; Gb5059.5-86 gravimetric measurement of silicon content; Gb5059.6-86 molybdenum blu-ray method for the determination of phosphorus content; Gb5059.7-88 infrared absorption method to determine carbon content; Gb5059.8-88 Coulomb method for carbon content determination; Gb5059.9-88 infrared absorption method for the determination of sulfur; Gb5059.10-88 Combustion potassium iodate titration method for determination of sulfur content.

2023

06-26

Physical state of ferric molybdenum

The product is delivered in block, the block size range is 10 ~ 150mm, the particle size below 10 10mm shall not exceed 5% of the total weight of the batch, allowing a small amount of block size in one direction to the maximum size of 180mm.

2023

06-26

Smelting method of ferro molybdenum

The main raw material for smelting ferro molybdenum is molybdenite (MoS2). Molybdenum concentrate is usually oxidized by multi-hearth furnace before smelting to obtain roasted molybdenum ore with sulfur less than 0.07%. Iron molybdenum smelting generally adopts the outside furnace process. The furnace is a cylinder placed on a sand base, lined with clay bricks, with 75% silicon ferrosilicon and a small number of aluminum particles as reducing agents. After the charge is added to the furnace barrel, it is smelted by the upper ignition method. An initiator (saltpeter, aluminum chips or magnesium chips) is used on the surface of the material, which is a violent reaction after ignition, and then sedated, slagging, and demolition of the furnace tube. The ferro molybdenum ingot is first cooled in the sand pit, then sent to the cooling room for flushing and cooling, and finally broken and finished. The metal recovery rate is 92 ~ 99%. Molybdenum oxide compacted block has been widely used to replace ferro molybdenum in steelmaking industry in recent years. Ferric molybdenum is usually smelted by the metal thermal process. Ferric molybdenum is a legally inspected commodity. The main producing areas are Jilin, Hebei, Jiangsu, Henan, Liaoning, etc., mainly exported to the United States, the Netherlands, Germany and so on.

2023

06-26

Properties and uses of ferric molybdenum

Molybdenum has an atomic weight of 95.94. The outer electronic structure is 4d5s, the melting point is 2615℃, the boiling point is 4610℃, and the density (20℃) is 10.2g/cm. The binary phase diagram of molybdenum and iron is shown in Figure 1. Molybdenum and iron form two solid solutions α and γ and two intermetallic compounds ε(Fe7Mo6) and σ(FeMo) phases. Industrial ferro molybdenum contains about 60%Mo, melting temperature is 1800 ~ 1900℃; The density is about 9.0g/cm. The role of molybdenum in steel can be summarized as improving hardenability, improving thermal strength, preventing tempering brittleness, improving remanence and coercivity and corrosion resistance in some media, and preventing pitting tendency. Due to the various beneficial effects of molybdenum in steel, it has been widely used in a series of steel grades such as structural steel, spring steel, bearing steel, tool steel, stainless acid-resistant steel, heat-resistant steel (also known as heat-strong steel), magnetic steel. Molybdenum in cast iron is very effective in improving strength and toughness, when the amount of 0.25% to 1.25%, the casting of medium and large section can also form pearlite matrix structure. Commonly used in rolls and other wear resistant castings.

2023

06-26

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