Physical properties of molybdenum:

Molybdenum is a metallic element found quite late, only in 1792 by the Swedish chemist extracted from molybdenite. Because of its advantages of high strength, high melting point, corrosion resistance and abrasion resistance, it has been widely used in industry. The relative atomic mass Chinese name English name Molybdenum ore Mo symbol Mo atomic number 42 main uses of iron and steel industry, industrial processing 96 Mohs hardness 5.5 melting point of 2610 DEG C boiling 4615 degrees density 10.2g/ fand cm

Deposit features: abundance in crust elements in molybdenum is about 1×10 - 6, in magmatite in granitic molybdenum containing the highest, up to 2×10 - 6. In the geochemical classification of molybdenum, it belongs to the transitional. Including ore formation, molybdenum and sulfur with generation of molybdenite. Other common mineral containing molybdenum and molybdenum iron ([Fe3+ (MoO4) - 8H2O]), calcium molybdate ore (CaMoO4), wulfenite (PbMoO4), jordisite (MoS2), ilsemannite (MO3O8 - NH2O).

Molybdenite (MOS2) is the most widely distributed molybdenum mineral and has the practical value of the industry more than 30 kinds of molybdenum containing minerals in nature in the known. Molybdenite is lead gray, and graphite approximation, with metallic luster, crystal is the six party system, often with a six square shape, the bottom surface often have a pattern, is soft and slippery feeling, thin flexible. The proportion of 4.7 -4.8, the hardness is 1 -1.5, the melting point is 795 DEG C, MoS2 row in the ceramic plate the streak of light green or greenish grey black, is heated to 400 - 500 DEG MoS2 is easily oxidized to produce MoS3, nitric acid and aqua regia can make molybdenite (MoS2) decomposition. Molybdenite MoS2 used in the production of ferromolybdenum, molybdenum, calcium molybdate, ammonium molybdate, lubricants etc..

Molybdenum ore beneficiation technology, molybdenum beneficiation process, molybdenum ore dressing method:

Is the main flotation recovery of molybdenum minerals are molybdenite. At the same time, in order to improve the quality of molybdenum concentrate, remove impurities, and then concentrate molybdenum concentrate. Molybdenite crystal is six layered or plate structure, formed along the interlayer van S Shijian - Mo - S layer structure and polar covalent bond of S - Mo. The bonding force between layer and layer is very weak, and the bond strength is very strong. So easily along the molybdenite structure layer is split sheet or plate output, this is the natural causes of Molybdenite floating well. Practice has proved that the grinding fineness appropriate, molybdenite crystal dissociation occurs in S - Mo - S layer, hydrophilic S - Mo face a small proportion. But after grinding, the increase in the proportion of S - Mo, the floatability of decline, though adding a certain amount of collecting agent such as polar xanthate collector, beneficial to the recovery of molybdenite, new slime flotation effect but the effect generated by grinding. The molybdenite separation to avoid and prevent excessive abrasion, in the production of subsection grinding and multi segment classification process, and gradually achieve the monomer dissociation, ensure high recovery rate of molybdenum concentrate.

Molybdenum crushing generally use three a closed-circuit crushing process, the final product size is 12-15 mm. Grinding is usually performed by ball mill or rod mill ball mill. Henderson is the only semi self grinding process. Flotation by flotation. Coarse production of molybdenum concentrate, coarse tailings recovery of associated minerals or discarded. Molybdenum coarse concentrate using two or three re grinding, the final selection of molybdenum concentrate, four, five times.  

Flotation reagents: molybdenum non-polar oil as collector, while adding foaming agent. The United States and Canada surfactant syntex (Syntex) for oil emulsifier. According to the ore properties, using lime as the modifying agent, water glass as gangue inhibitor, sometimes with cyanide or other heavy metal sulfide minerals inhibition. In order to ensure the quality of molybdenum concentrate, molybdenum concentrate of copper, lead, iron and other metal minerals and calcium oxide and carbon minerals needed for further separation: general use of sodium sulfide or sodium hydrosulfide, iron cyanide or cyanide copper and iron; by dichromate or Knox (Nokes) inhibition of lead. If the use of inhibitors, the impurity content is not up to the quality standard, still need to be supplemented by chemical mineral processing: secondary sulfide copper cyanide leaching; copper mine ferric chloride leaching; lead mine hydrochloric acid and ferric chloride solution leaching can reach the standard content. The gangue containing calcium oxide is easy to clay, therefore, for containing these gangue ore avoid grinding. Production often add water glass, six sodium hexametaphosphate or organic glue as gangue inhibitor or dispersant; also used activated carbon plus CMC (carboxymethyl cellulose) carbonate gangue. The final available hydrochloric acid or hydrochloric acid and ferric chloride solution leaching. The separation of carbonaceous minerals, first of all to find out the carbon is graphite, asphalt or coal. These carbonaceous minerals floatability and molybdenite are similar, but the density is small, usually by gravity method removal; using six sodium hexametaphosphate and CMC anti floating carbon molybdenum; or adding ferric chloride, water glass and six sodium hexametaphosphate inhibiting carbon is effective; the removal of organic carbon by roasting, is also one of the ways.

The gangue in SiO2 (SiO2) content is too high, often affect the grade of molybdenum concentrate. The investigation: the concentration of SiO2 decreased with the molybdenum concentrate grade increased, both of them have mutual consumption trends. As long as the molybdenum minerals to monomer dissociation fineness, SiO2 content can generally fall below the standard. Oil medicine plus activated carbon adsorption on molybdenum surface, coupled with the inhibition of CMC SiO2 content of silicate gangue, can be reduced to the following.

Molybdenum ore dressing equipment factory: Zhengzhou tronickey Machinery Co. Ltd. attention molybdenum dressing technology for 30 years, specialized in manufacturing processing equipment (molybdenum beneficiation equipment) according to the user's actual situation and the samples for you to design reasonable set of molybdenum production lines and supporting the reasonable quality of the molybdenum ore dressing equipment, installation and commissioning of equipment on-site guidance, training operation study of molybdenum ore dressing of new technology, new technology, molybdenum ore dressing of molybdenum ore dressing method is the specific operator can operate and use the entire production line of molybdenum ore dressing and molybdenum ore dressing equipment maintenance to do.

Quality and chemical composition

According to GB3200 technology of 89 molybdenum concentrate, is divided into three grades of nine varieties of molybdenum concentrate quality specifications

Molybdenum ore dressing method, molybdenum ore beneficiation process, molybdenum ore beneficiation process