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.

technology molybdenium wire

Nature of Kekai Tungsten & Molybdenum technology molybdenium and tungsten is very close to the boiling point and highlight its conductive properties , linear thermal expansion coefficient

The number is small, compared with the tungsten easier processing.
    Thermal conductivity metal screen with the best match to the specific heat , making thermal shock and thermal fatigue

Natural selection , after which the melting point of tungsten , but the density is smaller and therefore the strength of

Greater than tungsten and other metals in the application of the weight of several key requirements , the more effective. molybdenum alloys in order

Before two hundred people have high degrees of strength.
     The main drawback is the mother of poor oxidation resistance above six hundred degrees Celsius rapid oxidation

And poor ductility at room temperature . To avoid weaknesses, using high-temperature oxidation coating ways to control the problem ,

For that is the lack of generally low temperature embrittlement said too poor plasticity , the strengthening Canadian people by alloy

Carbides and other measures to strengthen the resolve to achieve .

Advantages of tungsten sheet fish pendant

Tungsten alloy fish pendant density, making it significantly smaller than conventional lead fish pendant. As the body Small size, so only need to spend some fish pendant. tungsten machined parts pellets higher hardness than lead , not card Main fish jawbone . The shape can be maintained more durable . High density tungsten alloy makes fishing becomes more Plus simple . Tungsten alloy pellets and sensitive , allowing you to easily feel what or with your Bait hit something, such as bushes , rocks , mud and so on. Lead is toxic and causes environmental pollution . Tungsten has the advantage of non-toxic and pollution-free , the Tungsten has replaced the lead, making it an ideal material for fishing sinkers .

Tungsten sheet alloy saw blade

Cold rolled metal saw blade is also referred to as "cold saw", used for cutting steel, the steel under the status of the material of the Kekai Tungsten & Molybdenum technology tungsten weights of the circular saw blade. Using silver welding materials of hard alloy cutter welding in cutting out tooth plate peripheral department, carbide cutter grinding is suitable for the style by cutting material. According to the purposes are divided into regrinding and TA (one-time) two kinds. Ever is to use known as feng hacksaw (HSS circular saw blade), band sawing machine, band saw blade, (are in high speed tool steel as raw materials), but there is difference of tungsten wires efficiency, (cannot fast cutting), short service life of cutting tools. In order to solve these problems, developed in circular saw blade part of the welding head. Now, this kind of tungsten plate saw blade is becoming the mainstream of the metal material cutting. In particular, can carry on the processing, only a small amount of coolant and saw blade is easy to manage a one-time TA cold saw increasing tendency at home and abroad very quickly. Due to steel as the core of the heavy industry, automobile parts processing industry and metal processing industry, requires cutting solid steel bar, the raw material such as iron, stainless steel rods, currently used metal circular saw blade, carbide saw blade can cut wood, organic glass/acrylic, copper, aluminum and other soft materials, in the face of the solid material cutting is "not".

Tungsten sheet electrode nozzles

 One kind of Kekai tungsten electrode nozzles, spray drying areas belonging to the field of mechanical equipment . The utility model using tungsten carbide materials and improve the structure of the nozzle so as to adapt to the high-pressure spray tungsten carbide nozzles. The utility model includes a protective shell , nuts, tungsten carbide rods nozzles core inserted in a protective case , and then tighten the nut on the protective shell. In addition to the utility model is characterized by the use of tungsten carbide rod nozzles as the core material , greatly improved wear resistance , but with the traditional nozzle structure also improved .

Tungsten steel sintering process

Tungsten steel sintering process can be divided into four basic stages:
1, removal of burn-forming agents stage,Kekai tungsten carbide rod following changes occurred during this phase sintered body:
Removal of the initial sintering agent as the temperature rises, forming agent gradual decomposition or vaporization, excluded from the sintered body, at the same time, more or less forming agent to increase the sintered carbon, carbon amount will vary forming agent different type, quantity and sintering process is changed.
Powder surface oxides are reduced, at the sintering temperature, the hydrogen reduction of oxides of cobalt and tungsten carbide, if the vacuum forming agent removal and sintering, the carbon-oxygen reaction is not strong. Contact stress between the gradual elimination of the powder particles, bonding metal powder beginning to recovery and recrystallization, surface diffusion began, briquette strength increased.
2, solid-phase sintering stage (800 ℃ - eutectic temperature)
Temperatures occur in the liquid phase under the previous, except to continue the process of what happens on stage, the solid-phase reaction and diffusion intensified, plastic flow enhancement, sintered apparent contraction.
3, liquid phase sintering (eutectic temperature - sintering temperature)
When the liquid phase sintered appear after contraction completed soon, followed by crystallization transition, the formation of the basic organization and structure of the alloy.
4, the cooling stage (sintering temperature - room temperature)
At this stage, the organization and the phase composition of tungsten carbide ball steel with different cooling conditions to produce some of the changes that can take advantage of this feature, tungsten steel heat treated to improve its mechanical properties.

Important tungsten sheet industrial raw materials

Tungsten is known as the "industrial teeth" or "industrial salt", was widely used in the defense industry, aerospace, oil exploration equipment and other industries.
Mainly used in the manufacture of Kekai copper tungsten trioxide or tungsten blue oxide of tungsten metal powder; metallic tungsten powder tungsten material downstream products series, such as tungsten, tungsten alloy and other electric vacuum materials; There alloy series, such as tungsten carbide alloy blade, alloy drill, alloy molds, etc.; other wear, pressure, temperature and other machinery and equipment components.

China Tungsten sheet Industry

China Tungsten Industry Investment Analysis and Forecast Report 2014-2018

China is the most abundant mineral resources of tungsten countries . By the end of 2008, China's tungsten reserves of 180 million tons of reserve base of 4.2 million tons , accounting for 60.0% and 66.67% , respectively, of the world , ranking first in the world . Over half a century , China Tungsten Industry is the world 's tungsten industry has made a significant contribution.

With the national economy and national defense fields as well as the changing international market demand for Kekai tungsten wire , tungsten national enterprises to increase product development efforts, and constantly develop new products, optimize the structure , formed from tungsten smelting products, chemical products , hard tungsten and tungsten weights carbide materials relatively complete range of products .2011 Tungsten prices hit the highest level in history , and has remained high and volatile , significantly improve the efficiency of the sector , compared with other metals, in the macroeconomic downturn, prices are still strong , is a better performance in 2011 one of nonferrous metals.

2012 , for China's tungsten tube industry, mixed. The joy is that the export quotas , limited mining, industry consolidation , such as the introduction of policies to improve the level of development of the whole industry ; variety of new technologies to achieve a breakthrough , effectively improve the industry 's profitability ; exploration has made new achievements , expanding the reserves . The worry is that the deterioration of the external environment , the European debt crisis continues , the export of the short-term is difficult to improve.

Now, with two main focus on China Minmetals origin - the integration of Jiangxi and Hunan, China Aluminum tungsten sheet resources and intervention , the concentration of tungsten industry has improved significantly , blind competitive situation will be improved and effective supply control will boost tungsten prices upward and positive tungsten industry ; industrial upgrading and mechanization of the open space needs of high-end products of tungsten rods , tungsten industry in the next five years China will usher in opportunities for continued growth .Investment Advisor in the release of " 2013-2017 China Tungsten Industry Investment Analysis and Forecast Report ," a total of nine chapters . Introduces the definition of tungsten , tungsten ore reserves and geological features , and then analyzes the policy environment , industry development and the market situation Chinese tungsten industry. Then introduced the development of a tungsten filament , tungsten carbide , tungsten ingot, tungsten -based alloys and other products . Subsequently, the report made ??to the regional development of tungsten industry analysis and key enterprises operating conditions , the final analysis of the future prospects of the development of the tungsten filaments industry.This study reports data mainly from the National Bureau of Statistics , General Administration of Customs , Ministry of Commerce , Ministry of Finance , CIC Industry Research Center adviser , the investment advisor market research center , China Tungsten Industry Association as well as domestic and foreign key publications and other channels , data authority detailed , rich , and through professional analysis and forecasting model , the core of the industry development indicators of scientific prediction . To you or your organization have a system for tungsten industry in-depth understanding , or want to invest in the tungsten industry , the report will be your indispensable reference tool.

The role of tungsten sheet

Tungsten is a non-ferrous metal, also belong to the important strategic metals, Kekai tungsten in ancient times known as rocks. Is discovered by Swedish chemist Carl William SheYeEr scheelite, tungstate and extract the new element, Depp son and later by spaniards found black tungsten ball also extract tungsten acid, in the same year, three oxide with carbon reduction for the first time in the tungsten powder, and naming the element. Amount of lines in the tungsten in the earth's crust is very low, have found containing tungsten alloy minerals has twenty kinds of tungsten deposit with granite magma activity. After refining the luster of the tungsten is silvery white metal, high melting point, hardness is very big. The mining of tungsten in the world today, about fifty percent is used for high quality steel smelting, about ten percent for making tungsten filament, about five percent of the used for other purposes, tungsten can manufacture guns, the rocket engine nozzle, cutting metal blades, drill bits, textile, military industry, aerospace, science and technology, various industrial fields. Is our common household light bulb, is made of tungsten wire. The main purpose of the tungsten tungsten and its alloys should be widely in electronic, electric light source industry. Used in the manufacture of all kinds of lighting bulbs, electronic lamp filament is used with a sagging resistance of doped tungsten wire. Adding metal rhenium doped tungsten wire, tungsten and molybdenium alloy is better than pure tungsten with high resistivity, beneficial willfulness, to used for tube lines, glass sealed lead.