Tungsten alloy is a tungsten-group sintered alloy consisting of tungsten and a binder phase with nickel, copper, iron, etc. Tungsten alloy is also used as radiation shielding material because of its excellent radiation shielding effect realized by its high density. Recently, due to environmental requirements, Tungsten alloy has attracted attention as replacement for lead which has been used for this application.

On the radiation shielding effect of tungsten alloy, we examined a comparative evaluation with lead. Fig.1 shows the attenuation rate of γ-ray (Co60) against the change in thickness of tungsten alloy and lead. The γ-ray (Co60) used for the evaluation this time is that eradiated from relatively a high energy zone, which becomes an issue in the case of nuclear power station.

This evaluation proves that tungsten alloy of about 3mm or 7mm thickness has the radiation shielding effect equivalent to lead of about 4.5mm or 10mm thickness respectively. consequently, tungsten alloy, compared with lead, has 1.5 times shielding effect against γ-ray (Co60).

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Radioactive isotope called "radioisotopes." Isotope radiation technology now widely used in industry, agriculture, health, archeology, and environmental protection and other aspects, including radiation detectors, radiotherapy apparatus and medical X-ray instruments. The most important component of radiation technology equipment is the radiation shielding container. When using radiation technology, place radioactive isotope within the shielding container is the most important thing. Due to its high density, excellent absorption behaviour against radiation and environmental friendly characteristics, tungsten material can be widely used to produce isotope radiation container.

Applications of tungsten isotope radiation container:
Industrial instrumentation equipment and petroleum drilling
Cancer treatment equipment
Weld inspection
Large container inspection equipment
Nuclear submarine accessories

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This paper studies the process test of copper-bismuth separation from sulfide minerals associated with tungsten ore by applying the combined process of gravity separation,flotation and gravity separation.The results of small closed-circuit test: the copper concentrate with the grade of 25.03 % and the recovery of 93.93 %;the bismuth loss rate in the copper concentrate is 7.08 %;the bismuth concentrate with the grade of 15.08 % and the recovery of 79.42 %;the copper loss rate in the bismuth concentrate is 1.84 %.

 

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Sodium polytingstate are also known as sodium metatungstat. Its physical properties are as follows: chemical formula: Na6O39W12, molecular weight: 2968, density: 3.1g/cm3, CB number: CB1128947, CAS number: 12141-67-2.
Sodium Polytingstate because of its high density, non-toxic, easy preparation and can be recycled and other advantages so it has been widely use in many areas. For example sodium polytingstate wildly use in density separation research area of geology, soil science and marine biology. In geology it is mainly used in separation minerals and sedimentary rocks, for the separation of micro-fine pure minerals providing a new way. In soil science it is mainly used in separate large particles of soil aggregates, organic matter and humic acid and so on. In marine biology and is mainly used in the separation of ancient microbial and organic matter. On the other hand, using sodium polytingstate solution to density separation the operation is simple and the effect is stable. What’s more it not changes the physical and chemical properties of substances to be separated.

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Simulation and Analysis on Flow Field in Leaching Tank With Dual-impeller for Alkali Cooking Tungsten Ore

Computational fluid dynamics method was applied to study three-dimensional flow field in leaching tank with JH type axial impeller and straight blade impeller.The velocity field,pressure field and turbulent kinetic energy field in leaching tank were analysized rotating at constant speed of 300 r/min and taking the fluid of sodium hydroxide mixed with tungsten ore as simulation object by using the multi-reference frame(MRF) and standard k-ε turbulent model.The research provided scientific basis for structure optimization design of leaching tank.

 

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Lianhuashan deposit, the first porphyry-type tungsten deposit ever discovered in China, is located in the east of Guangdong Province. Stratigraphically only Jurassic Xiaoping coal series and acidic volcanic rocks occur in the mining area with the latter unconformably overlying the former. Biotite granite, quartz-porphyry and quartz diorite-porphyrite constitute the major intrusives. Rb-Sr isochron ages of the volcanic rocks and the granite are 135.8 ±2.5 m. y. and 137.2± 2.5 m.y. respectively, indicating that they are products of the identical magmatic activity. K-Ar apparent ages vary between 76.6 m.y. and 119.5 m.y. with the K~(40)-Ar~(40) isochron age of volcanic rocks determined at 120.4±12.1 m.y. These ages are as a rule younger than the corresponding Rb-Sr ages. The formation of ferberite-bearing greisen represents the first stage of tungsten mineralization. The K-Ar age of its muscovite is 119.5 m.y., denoting the coincidence of the tungsten mineralization with the igneous rocks in their formation time. The younger K-Ar apparent ages of samples from this area might be chiefly attributed to the effect of the late stage thermal events in the mega-metallogenic belt around the Pacific Ocean. The stable isotope measurements give the following δS~(34)(‰) values:pyrrhotite, from -0.05 to + 3.14;pyrite, from -0.85 to + 3.3; total sulfur(δS_(ΣS)~(34)), 2.0, suggesting that sulfur in the deposits came from deep sources. Initial ratios of Sr isotopes for volcanic rocks and granitic rocks are 0.7061 ±0.0004 and 0.7069 ±0.006 respectively, showing that, in addition of occurring in the same period, they were derived from the same sources. The materials for igneous rocks and tungsten deposits were probably formed as a result of the melting of the oceanic plate along the subduction zone.

 

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The most extensive magma activity and mineralization in Shirenzhang zone occurred in Yanshan Period,which is also the most important mineralization term in East China.The magma activity and mineralization of Shirenzhang region in Yanshan geological period must be restricted by the bigger tectonic environment of East China.In another word,the magma activity and mineralization of Shirenzhang zone in Yanshan period is a reflection of magma activity and mineralization of Shirenzhang zone in East China.This paper tries to talk about the tectonic-magma-mineralization of Shirenzhang zone in a bigger environment of East China.

 

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dartboard setup tips:

1. Setup your dartboard in a safe and secure area that is wide enough for people to stand around while waiting to play. An area with at least a meter on both sides of the dartboard should be wide and safe enough to prevent anyone from getting hurt if any darts should bounce-out.

2. The area should preferably have a carpet or wooden floor. Tile floors, cement or anything similar will damage the darts that bounce-out. It is a good idea to place a dart mat directly below the dartboard on any type of floor. A dart mat will protect your darts and will save you time to install an oche(throwing-line), because dart mats are completely marked for this purpose else any normal piece of carpet will do.

3. The area must be well lit or contain / be able to hold the necessary fixtures to provide adequate lighting to the dartboard.

4. It is a good idea to place the dartboard in a dartboard cabinet. A cabinet will protect the wall and will save you time to put up scoreboard/s.

5. If a dartboard cabinet is not used, erect a scoreboard on one or both sides of the dartboard, where it is easy visible.

6. If a dartboard cabinet is not used, it is a good idea to place a wooden board or some kind of protection behind the dartboard to protect your darts and the wall should someone miss when throwing at the dartboard.

7. Make absolutely sure that all dartboard setup measurements are 100% accurately. Once you get use to the throwing distance and height, you can immediately feel it if someone else’s measurements are not the same and it will influence your throwing and vice verse.

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High Jump tungsten dart rule is a very unique style of game similar only to it's cousin, Broad Jump. It may be played by any number of players or teams and is a good game to play with an odd number of people.

The Object: The object of the game is to "jump" higher than your opponents.

The Scoring: Players names are written in order down the left side of the scoreboard. Order is usually determined by throwing one dart each at bulls-eye. Closest to the bulls-eye throws first, farthest throws last.

The Play: Each player in turn throws three darts trying to advance the target numbers to make the highest "jump". The targets are up the center of the board in order: Double-3, Large-3, Triple-3, Small-3, Bulls-eye, Double-Bulls eye, Bulls-eye, Small-20, Triple-20, Large-20, Double-20.

For a dart to count, the targets must be hit in order, one dart each. Play begins with the Double-3, once the Double-3 is hit the player may now throw at Large-3 and so on across the board.

After the each player throws all three darts, the "highest" target that was hit becomes the height of the jump and is written next to the player's name and play continues with the next player. The next time that player throws again, the target number is the next number after the old target. This means that each round extends the height of the jump for that player.

If the player misses the target with all three darts, that player's jump is over and the last target that was hit becomes the final height of the jump. That player does not throw again.

After all players have missed their target with three darts, whoever's jump was highest wins the game. If more than one player has the same height jump at the end of the game or both made it all the way across the board, those players alone should play again to break the tie.

Strategy: Take your time and concentrate when you get to the bulls-eye area. They are hard to hit, but if you get past them, it's all down hill from there.

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Tungsten dart flights stabilize a tungsten dart throw differently depending on their shape, size and texture. Creating your own tungsten dart fights allows you to personalize your tungsten darts to your own preferences and style of dart throwing. You can choose the material, texture and design of your flights to express yourself and to give yourself a leg up on the competition. Making your own flights also gives you greater control over the feel of your tungsten darts.

Decorating the Tungsten Dart Flights:

1. Trace the flight template two times onto a plastic sheet with a pen.

2. Cut out both flights with a utility knife.

3. Draw your design on both flights.

4. Cut a thin, rectangular slit halfway up the first flight. Begin cutting at the bottom of the flight.

5. Cut a thin, horizontal slit halfway down the second flight. Begin cutting at the top of the flight.

6. Slide the two slits together to interlock the flights.

7. Line up the flights along the slits so that tops and bottoms connect exactly.

8. Glue the flights together along the seam.

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