Wolfram is kind of essential mineral to get tungsten, and it is usually inlayed in granite and quartz together with cassiterite. Wolfram is weak magnetic with its density of 7.2-7.5g/cm³ and mohs hardness of 4-4.5.

The process of wolfram dressing is mainly gravity separation while sometime intensity magnetic separation can be involved. Wolfram tungsten ore is usually inlayed with coarse granules with big density and small hardness, so the specific separation or concentration of wolframite tungsten can be pre-selection, gravity separation after screening & classifying, intensity magnetic separation and treatment of fine tungsten mud.

The big density difference between wolfram and gangue makes gravity separation workable if the wolframite tungsten granules can be liberated or dissociated from the impurities. For the coarse tungsten or blocky tungsten separation, gravity separation can be used to get the coarse wolframite granules. Here the main wolfram dressing plant is jigging machine. The wolfram ore concentration machine can deal with ore of +80 meshes to 30mm. For some finer tungsten ore, shaking table or other equipment can be used to get the fine wolframite grains.

In the gravity separation of wolramite tungsten, the common processing plant can be jig separator and shaking table. Jigging machine is especially important to beneficiate wolfram tungsten of coarse and medium granules. The raw wolframite tungsten needs crushing and screening before jigging processing to gain high grade tungsten.

As kind of wolfram beneficiation machine, jig has been added to the circle of milling in order to reduce the pelitization of tungsten. The tungsten concentrate from jigging gravity concentration occupies a big part of the whole concentrate.

Shaking table is to separate wolfram of fine grains with its good enrichment ratio, great beneficiation efficiency. So the classifying of raw wolfram ore is necessary before separation.



 

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For industrial radiography using gamma radiation sources such as Iridium-192 or Cobalt-60, a collimator allows the radiographer to control the exposure of radiation to expose a film and create a radiographic "negative", a.k.a., a radiograph, to inspect materials for defects. A collimator in this instance is most commonly made of tungsten, and is rated according to how many half value layers tungsten material contains, i.e., how many times tungsten material reduces undesirable radiation by half. For instance, the thinnest walls on the sides of a 4 HVL tungsten collimator 0.52" thick will reduce the intensity of radiation passing through them by 88.5%. The shape of these collimators allows the radiographer to direct the radiation to the film and away from other workers.

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Tungsten collimators are used in linear accelerators used for radiotherapy treatments. Tungsten collimators help to shape the beam of radiation emerging from the machine, they can limit the maximum field size of a beam. The treatment head of a linear accelerator consists of both a primary and secondary collimator. The primary collimator is positioned after the electron beam has reached a vertical orientation. When using photons, it is placed after the beam has passed through the X-ray tungsten target. The secondary collimator is positioned after either a flattening filter (for photon therapy) or a scattering foil (for electron therapy). The secondary collimator consists of two jaws which can be moved to either enlarge or minimize the size of the treatment field.

New systems involving multileaf collimators (MLCs) are used to further shape a beam to localize treatment fields in radiotherapy. MLCs consist of approximately 50–120 leaves of heavy, metal tungsten collimator plates which slide into place to form the desired field shape.

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The main component of tungsten ore is tungsten.Tungsten is a dull silver-colored metal with the highest melting point of any pure metal.Also known as wolfram, from which the element takes its symbol, W, tungsten is more resistant to fracturing than diamond and is much harder than steel. It is the refractory metal's unique properties - its strength and ability to withstand high temperatures - that make it ideal for many commercial and industrial applications.

Applications:

Tungsten's primary application for over 100 years has been as the filament in incandescent light bulbs. Doped with small amounts of potassium-aluminum silicate, tungsten powder is sintered at high temperature to produce the wire filament that is in the center of light bulbs that light millions of homes around the world.

Due to tungsten's ability to keep its shape at high temperatures, tungsten filaments are now also used in a variety of household applications, including lamps, floodlights, heating elements in electrical furnaces, microwave ovens, x-ray tubes and cathode-ray tubes (CRTs) in computer monitors and television sets. The metal's tolerance to intense heat also makes it ideal for thermocouples and electrical contacts in electric arc furnaces and welding equipment. Applications that require a concentrated mass, or weight, such as counterweights, fishing sinkers and darts often use tungsten because of its density.




 

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