molybdenum wire Application of molybdenum disilicide

Molybdenum disilicide used in high temperature oxidation resistant coating material , electric heating elements, the integrated electrode films , structural materials, composite materials, molybdenum wire reinforcing agents, wear-resistant materials , structural ceramics and other fields connecting material
, Distributed in the following industries :
1 ) Energy Chemical industry: electric heating element , atomic reactor unit high temperature heat exchanger , gas burners , high temperature thermocouple and protection tube , crucible melting vessel ( used for melting sodium, lithium,
Lead- bismuth, tin and other metals ) .
2 ) the microelectronics industry : MoSi2 with some other refractory metal silicide Ti5Si3, WSi2, TaSi2 and tungsten sheet so is the LSI gate and interconnect film important candidate materials .
3 ) aerospace industry : high temperature oxidation resistant coating material as widely and deeply studied and applied. Especially as turbine engine components, such as blades , impellers , the combustor , nozzle , and
Sealing means of the material.
4 ) automotive : automotive turbocharger turbine engine rotor , valve body, spark plugs and engine parts.

molybdenum disk quartz glass melting furnace

Since the melting point of molybdenum up to 2610 ℃, therefore molybdenum crucible is widely used in sapphire crystal growth furnace, quartz glass melting furnace, rare earth smelting furnaces and other industrial furnace core container, the use of working molybdenum bar temperatures generally above 2000 ℃. Especially for sapphire crystal growth furnace, it has a high purity, high density, without internal cracks, size precision, smooth inner and outer walls, and other molybdenum crucible of molybdenum crucible for sapphire crystal growth process seed success rate, pulling quality control, life off the crystal stick pan and played a key role. Molybdenum boat / molybdenum crucible, molybdenum plate heat rolling, with high strength, high temperature and other characteristics. It profiles molybdenum disk orderly, soldered into place, thus ensuring the molybdenum boat at high temperature and pressure conditions, with the best survival. Molybdenum Crucible is mainly used for coating technology, electronics and engineering industries.

Molybdenum plant nutrition and lack of the main

Molybdenum plant nutrition and lack of the main symptoms of molybdenum
Legumes body molybdenum concentrate in the rhizobia , followed by the seeds. Soybean plant , its leaves above the stems and petioles of Kekai molybdenum bar , molybdenum is higher than the reproductive organs of vegetative organs , the highest seed molybdenum content . Molybdenum has a good effect on the process of nitrogen fixation and legume crop growth and development , molybdenum can promote the strength of photosynthesis, promote the role of nitrate

High and local overheating of the circulating water system

Security: sodium molybdate toxic , but low toxicity compounds. Kekai molybdenium poisoning can cause joint pain,Cause low blood pressure and blood pressure fluctuations , neurological disorders, metabolic processes obstacles. Soluble

Molybdenum compounds aerosol maximum allowable concentration of 2mg / m, the dust is 4mg / m. Access to and use of molybdenum alloys When sodium required to wear protective equipment . Pay attention to moisture . Transportation beware of rain, sun Uses: used in the manufacture of alkaloids , ink , fertilizers , molybdenum red pigment and pigment Fast precipitant Metal catalyst , molybdenum bar salts , can also be used to make flame retardant and suppression of pollution- water system Preparation , also used as galvanizing , polishing agents and chemical reagents.

The use of sodium molybdate disk

Kekai molybdenum disk low toxicity , low pollution levels of environmental pollution , is a novel application of more Water treatment agent . In order to obtain a better release effect , molybdenium often with polyphosphates, grapesSugar, salt , zinc , BTA complex to use , so not only can reduce copper molybdenum make Dosage, but also improve corrosion effect , the amount of the complex molybdates by 200 ~ 500mg / LDecreased to 4 ~ 6mg / L. Molybdate film process, dissolved oxygen must be present, withou mCalcium ( or other divalent metal ion

 s ) .

Status of foreign molybdenum wire ore beneficiation

Molybdenum concentrate leaching
Some get a molybdenum concentrate plant , copper , lead, iron

and other impurities substandard . According to the U.S.

Climax Molybdenum Company's quality molybdenum concentrate

quality standards : MoS2 should be 95%, Cu should be less

than 0.15%, Pb should be less than 0.05%. In the

international market , quality almost, prices sent many ,

such as the company's high-quality molybdenum concentrate

price of 1 July 1975 was $ 2.43 / lb , unqualified to $ 2.236

/ lb, the race to 2.5 ~ 17 %. In order to reduce the content

of these metals , and some plant using different leaching

process .
    Brenda plant concentrate containing 55.3% molybdenum

grade is relatively high , but the content of copper and lead

undesirable . To this end , the plant uses the Noranda

company developed the leaching process to reduce impurities

to improve the quality of concentrate . This process is the

principles and methods : copper chloride, ferric chloride

leaching of molybdenum oxide and calcium solution of Cu, Ca

and Pb cupric chloride and ferric chloride ( the amount of

103 and 41 g , respectively / t of concentrate ) in a sodium

chloride solution containing 20 to 30% of the chalcopyrite

and galena effective chlorinating agent , calcium chloride or

sodium chloride to reduce the PH value , and to increase

Boiling Point ( 4850 feet elevation Brenda located on the

leaching requires a higher boiling point ) , shorten the

leaching time . Brenda most effective plant molybdenum

leaching solution containing 1% of cupric chloride, ferric

chloride, 10% and 30 % calcium chloride . Leaching at 2 hours

at 100 ℃ , can Cu, Pb leaching rate of 98%, Ca leaching rate

of 79% is dissolved molybdenum is less than 0.5% . Used

leachate chlorine gas can be quickly regenerated. After each

batch leaching let go 30% of the leaching solution , in order

to control the leaching solution of copper and lead harmful

elements. After leaching the copper content of molybdenum

concentrate fell to 0.063 percent from 0.337 percent lead

content to 0.05 % molybdenum grade increased from 55.3% to

56.6%. After cooling the concentrate , and this was washed

twice ( including filtration and recycled pulp ) through ,

and a final filtration and dried .
    Valencia Rita plant selection molybdenum concentrate

containing 47 to 48% molybdenum , copper contained in order

to further remove , to improve the quality , the plant uses a

ferrous chloride leaching . The first process is filtered and

dried to molybdenum temperature 2% , and ferrous chloride

leaching of copper leaching solution ( 2.5 ~ 3.0% ) ,

molybdenum up to grade 53 to 54 %. After the concentrate

leaching and filtered again and dried , and within 2 meters

of the roaster roasting ф.16 give trioxide, 60 to 61 percent

of its grades , less than 1% sulfur , into the alloy

preparation plant molybdenum iron. Cologne plant in order to

reduce the copper content of molybdenum , using sodium

chloride leaching, the product is filtered and then dip the

slurry , and then sent to acid leaching , in order to further

reduce the amount of copper , molybdenum acid leaching after

final filtered and dried.

One kind of tungsten sheet

One kind of tungsten carbide - cobalt or Kekai tungsten carbide rod - cobalt - chromium in the thermal spraying powder production method,The present invention relates to a WC - Co or WC - Co - Cr thermal spray powder for preparing the powder or the tungsten carbide powder and cobalt powder, cobalt powder and chromium powder mixed in a certain ratio to prepare a slurry , spray granulation, the granulated powder is sieved and degreased in a vertical rapid sintering temperature sintering furnace , the body movement pattern of the powder falling through the continuous and uniform heating and cooling zones , and heating to complete the sintering zone , the protective atmosphere : nitrogen, sintering temperature : 1000 ~ 1700 ℃, sintering time : 0.1 ~ 5s, finally sintered powder required for grading and screening . The invention solves the spherical tungsten carbide rods -based composite thermal spray powder using the presence of long production cycle, low productivity and energy consumption and other problems when traditional methods of preparation ; present invention , the process is simple , continuous production , energy saving and environmental protection, the resulting powder composition uniformity , high sphericity and liquidity , and can be widely used in aerospace , machinery manufacturing , and petroleum and chemical industry.