Tungsten Metal Price

Tungsten Carbide Nozzle Lifespan Improving

Details: Category: Tungsten Information; Published on Friday, 14 August 2015 16:27; Written by xiaobin; Hits: 278

The most popular material used in nozzle is steel, pottery, tungsten carbide, diamond, artificial gem and so on. Among of them, tungsten carbide is the most widely used currently due to its good hardness and toughness. In terms of microstructure, it is closely related with its anti-corrosion. Some experimental statistic shows that domestic WC tungsten carbide grains is easily peeled off under the impact of the jet flow because of its clear boundary and the poor anchoring strength of grains.

However, abroad WC tungsten carbide exists in crystallization so that the anti-corrosion of nozzle is better than domestic WC tungsten carbide nozzle. From mechanics of view, different materials (metal, tungsten carbide and pottery) have different abrasive mechanism. Metal has better toughness than fragile pottery and their erosion rate is distinct, such as YT15 tungsten carbide is a order of magnitude higher than the pottery in erosion rate, which reveals that hardness of material is more important than fracture toughness in anti-erosion.

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Tungsten Mining and Processing-II

Details: Category: Tungsten Information; Published on Friday, 14 August 2015 16:26; Written by xinyi; Hits: 291

Tungsten is mined by conventional underground and open cut mining technologies.

Depending on the exact mineralogical properties of the ore including any valuable by-products or unwanted contaminants, various methods can be combined to produce a concentrate. A final tradeable concentrate has generally a concentration of 65% WO3 or more.

The tungsten concentrate is than processed to either ammonium paratungstate (APT) or ferrotungsten (FeW) as the intermediate material for the various tungsten uses. APT is the most common intermediate form of tungsten in which it is traded and the price for ore concentrate is directly linked to the price of APT. The price is usually quoted as RMB / mtu or USD / mtu APT (mtu – metric ton unit = 1% of one metric ton = 10kg).

China is currently the largest tungsten producer, accounting for about 84% of world production in 2011. It is followed by Russia, Canada, Austria, Bolivia, Portugal and a number of smaller producers. China has also the largest reserves according to the USGS accounting for 59% of world reserves. Other countries that have significant known reserves are Russia, the United States, Canada as well as Australia.

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Tungsten Mining and Processing-I

Details: Category: Tungsten Information; Published on Friday, 14 August 2015 16:23; Written by xinyi; Hits: 320

Tungsten is mined by conventional underground and open cut mining technologies. Due to the low solubility of scheelite and wolframite and the characteristics of tungsten deposits, in-situ recovery or heap-leaching cannot be used to extract tungsten. On some historical mine sites, reprocessing of tailings can be economic to produce tungsten that was previously not recovered.

From the mined ore, a tungsten concentrate can be produced by various methods. First steps are usually crushing and grinding. Ore sorting (X-ray, optical or UV in the case of scheelite) can be used to pre-enrich the mined ore. As scheelite and wolframite are both heavy minerals, gravity methods can be used to produce a concentrate. Scheelite is also susceptible to flotation while wolframite is not. In contrast, magnetic separation can be used for wolframite while it is not possible for scheelite separation.

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Tungsten Carbide Hydraulic Sand-blasting Nozzle Abrasion IV

Details: Category: Tungsten Information; Published on Friday, 14 August 2015 16:25; Written by xiaobin; Hits: 281

In addition, the particles move at a high speed in tube, which makes intense friction with inner wall and produces a quantity of heat. Although the cooling water takes off a part of heat, it brings about part difference in temperature and stress field, which leads to thermal peeling. What’s more, micro-structure of the inner wall will be spread into water by the rest of heat, and chemical composition has been changed. Therefore, the performance of nozzle is reduced and the abrasion is severer, which called spreading wear.
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Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
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Tungsten Carbide Hydraulic Sand-blasting Nozzle Abrasion III

Details: Category: Tungsten Information; Published on Friday, 14 August 2015 16:22; Written by xiaobin; Hits: 331

If the sand impacts the inside wall with a larger angle, whose hardness is lower than nozzle material, the surface of nozzle will be out of shape. And the water flow will harden the surface, which small cracks come into be some new cracks so that the strain exceeds the ultimate strength and falls off finally. This is fatigue wearing. Although tungsten carbide nozzle has good hardness and toughness, it belongs to fragile materials. Its inner wall is wearing the sand flow impact and water flow is squeezing into through the cracks, which called brittle rupture abrasion.
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Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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