Ganzhou, being the birth place of Chinese tungsten ore industry, is extremely rich in tungsten source. So when tungsten is talked about, people will naturally focus their eyes on Ganzhou, just like that oil will remind people of Middle East.

Tungsten, as a rare and refractory metal, is an important strategically metal. As estimated the tungsten content in stratum is only I in the grade of ppm. But it is very rich in China. 65% of total tungsten deposit in the world is in China. It ranks the first in the world. From stratigraphical analysis the tungsten content in stratum of Ganzhou is 9.53-12 ppm and this is more than 7 times over the world average value of 1.33 ppm. The deposit of tungsten and the output of tungsten concentrate in Ganzhou, each take 30% that of total in China. Among them the deposit of high grade wolframite takes as much as 70% that of total in China and 60% in the world. So Ganzhou is called as “Tungsten capital of the world”.

 

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Previous radiation shielding products have been made mainly from lead sheets, making them heavy and hard to handle, and there have been concerned about their effects on the human body. By contrast, tungsten polymer sheet is comprised of soft thermoplastic lassoers integrated with an inorganic substance that shields against radiation. Outstanding features are its flexibility and ease of handling.

The raw materials used in tungsten polymer sheet have been proven to be safe and have no effect on the human body. Tungsten polymer is a high-polymer material that possesses the properties of both plastic and rubber. It can be cut or holed with household scissors and formed into shapes with various curved surfaces.

Tungsten polymer sheet can be used in:
-Radiation shielding and radiation-protective equipment;
-X-ray inspection device for industrial and medical use;
-Gamma-ray shielding material and substitute for lead fiber mat in nuclear reactor piping systems.

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For decades, lead has been considered in radiation shielding. It’s cheap, easy to process, and provides very effective shielding. Yet growing health, safety and environmental concerns over the mining, processing, handling and disposal of lead have brought about an increasingly stringent regulatory environment regarding the sale and use of lead products.

There are three factors which determine the amount of radiation received from a source: 1) time of exposure; 2) distance from source; and 3) shielding. Based upon the application, the material density and wall thickness has been found. Utilizing a composite of tungsten powder in a polymeric matrix, lead free radiation shielding materials provide device manufacturers and material processors with a completely lead-free, injection-moldable thermoplastic solution to overcome all regulatory concerns and satisfy radiation shielding needs.

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In the 1880s, Western countries developed lanthanum tungsten electrode to replace thorium tungsten electrode product, after that, it is very popular in the international welding industry due to its excellent welding performance, for this reason, the export volume of lanthanum tungsten electrode is just behind thorium tungsten electrode.
In other countries, under normal circumstances, thorium tungsten electrode would be replaced by lanthanum tungsten electrodes. Because La₂O₃ has the following advantages: (1) the lowest electronic work function; (2) the lowest tip temperature; (3) the easiest arcing and the like.

The existence of these advantages can effectively prevent crystal growth, so that its life can be prolonged. By testing lanthanum tungsten electrode 2% of La₂O₃ showed that: If there is no overload current exist, it has a longer life than thorium tungsten electrode, and its arc is easier to use.
Lanthanum tungsten electrode: 2% of La₂O₃; 1.5% of La₂O₃; 1% of La₂O₃. The most common is lanthanum tungsten electrode containing 2% of La₂O₃ (called lanthanum oxide).

 

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