Tungsten Ore Dressing-I
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- Category: Tungsten Information
- Published on Tuesday, 04 August 2015 09:41
- Written by xinyi
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Most of the tungsten ore deposits are also spatially related to Yenshanian granites. These granites include several intrusions, isotopically dated at 160–180 m. y. and 70–100 m. y. The concentration of trace elements, especially W Mo, Sn, Ta, Nb, Li, and F are relatively high in the granites. In the granites of South China, the average WO3 is 4.35 ppm, but in Yenshanian granites, which are the youngest of these, the average WO3 is 5.16 ppm. In the youngest of Yenshanian granites, a light mica-albite granite has been identified, whose average WO3 is as high as 242.3 ppm. From this line of evidence, the tungsten ore deposits in South China are considered to be genetically related to Yenshanian granites.
Wolframite-sulfide-quartz veins and scheelite skarns provide the bulk of the reserves and production. There are many different kinds of alteration associated with the different tungsten ore deposits, but the principal ones are silicification, greisenization, potash-feldspathization and chloritization.
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Tungsten Carbide Nozzle and Other Materials Comparison (2)
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- Category: Tungsten Information
- Published on Monday, 03 August 2015 18:53
- Written by xiaobin
- Hits: 331
The process of tungsten carbide nozzle is more complicate than the iron, and the price is more expensive. Tungsten carbide nozzle has good toughness, strength, and conductivity for heat, but its lifespan needs to be promoted. In addition, it’s not suitable for producing nozzle with complicated structure. The most widely used in practical application is that made into ring and set in the most easily abrasives, such as Y types used by the USA, Canada, and Chinese multilevel nozzle.
Pottery has good performance in anti-corrosion and heat-resisting, which becomes the first choice in project application gradually, such as cutting-tools making, bearing parts, motor parts and some anti-corrosion parts for metallurgy, coal mine and chemical industry. What’s more, pottery nozzle lifespan is a great leap forward compared with iron and tungsten carbide. However, potter has two unavoidable shortcomings, which are the cost and the fragility. It is easily broken and spalling under a huge impact so that it is not suitable for some occasions of huge impact.
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Tungsten Alloy Shielding in Positron Emission Tomography
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- Category: Tungsten Information
- Published on Monday, 03 August 2015 16:59
- Written by wenjing
- Hits: 314
Positron emission tomography (PET) is one of the nuclear medicine techniques available for diagnosis. Whilst X-rays provide information on the structure of the body, PET shows the chemical function of a particular organism. PET involves the injection of FDG (a glucose-based radionuclide) shielded syringe into the patient. As the FDG travels through the patient’s body it emits gamma radiation which is detected by a gamma camera, from which the chemical activity within cells and organs can be seen. Any abnormal chemical activity may be a sign that tumors are present. PET scans are frequently used to detect cancerous tumors and diseases of the brain and coronary arteries.
Applications for tungsten alloy shielding in PET include:
PET syringe shield
Tungsten vial shield
Tungsten FDG transport container
Collimator for gamma camera
Technetium generator
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Tungsten Carbide Nozzle and Other Materials Comparison
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- Category: Tungsten Information
- Published on Monday, 03 August 2015 18:51
- Written by xiaobin
- Hits: 308
In early days, iron was the most popular materials for nozzles, but its lifespan is short. With the development of grind compound jetting and material science, the first nozzle made by tungsten carbide (WC) came out, which had a longer lifespan in the late of 1930’s. After that, pottery nozzle is appearing. In a word, nozzle made by pottery has the longest lifespan compared with iron and tungsten carbide.
Nozzle made by iron has good processing technique and toughness, and it can be improve in hardness and toughness through heat treatment. However, it has the high rate of erosion under low angle of erosion so that its lifespan is short. In general, iron nozzle processing is simple and cost little, but it’s not suitable for large-scale project. In addition, we can use seamless steel tube to make nozzle, which has two different functions.
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Tungsten Alloy Shielding for Nuclear Medical
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- Category: Tungsten Information
- Published on Monday, 03 August 2015 16:51
- Written by wenjing
- Hits: 277
Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease. Nuclear medicine scans are usually conducted by radiographers. Radiation is an effective tool within nuclear medicine for both diagnostics and treatment of patients.
Tungsten alloy is ideal for shielding against X-rays and gamma radiation. The very high density of tungsten shielding, which is more than 60% density than lead, allows a reduction in the physical size of shielding components, without compromising their rigidity or the effectiveness of the shielding characteristics. Tungsten alloy shielding is used in applications such as collimator, nuclear shielding, beam stop, PET syringe shield, vial shield, isotope container, FDG container, multileaf collimator etc.
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