Scheeelite (CaWO₄) is the principal tungsten mineral in domestic ores, but other important tungsten minerals include wolframite (Fe, Mn) WO₄, ferberite (FeWO₄), and hubnerite (MnWO₄). All of these minerals may be floated in a soda ash alkaline pulp with fatty acid type collectors.

Because of the high specific gravity of the tungsten minerals, they are amenable to gravity concentration methods. However, the fine dissemination of the ore minerals in the gangue usually makes fine grinding necessary, and requires at least some flotation concentration for the recovery of the finer sizes. The trend has been toward all-flotation recovery with gravity processes being used only as a means of upgrading a part of the concentrates.

If the ore contains pyrite or other sulfides, a preliminary sulfide flotation stage is usually employed ahead of both tabling and flotation of the tungsten. The low cost and high collecting power of xanthates makes them the favored collector for this sulfide float. Soda ash or sulfuric acid is usually added for pH control. Acid is frequently preferred for those ores containing pyrrhotite. However, its use with calcite gangue ores will result in the formation of calcium sulfate, which may float with and dilute the subsequent tungsten flotation concentrate.



 

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A brief history of the sport of darts from the middle ages to today:

Early beginnings. The popular belief is that darts was created as a result of the boredom of being a warrior in medieval times. During downtime between battles, soldiers would challenge each other to games of throwing short spears at a thin slice of a felled tree. The age rings in the wood and the cracks that developed from drying created a simple likeness of a modern dart board comprised of multiple lines and many different scoring areas. The game became quite popular in the middle ages as it was used to keep soldiers’ throwing arms in practice.

A game for everyone. The sport of darts eventually became more widespread and even noblemen would be known to shoot a round from time to time. In fact, history shows that England’s King Henry VIII was given a set of darts as a gift. The game as we know it was in jeopardy of being changed over the years. People tried many different variations such as using a blowpipe to direct the dart. Some Scandinavians still play a version of darts by throwing foot long small spears from several yards away.

A game that almost never was. As it grew in popularity, the game of darts has defeated multiple attempts to have it banned. Many people believed that darts was a game of chance and not a game of skill, so it had to be settled in a courtroom in 1908. The game was banned in Scotland as a corrupt influence but the public outcry made it short-lived.

The modern game of darts. Today the sport is most popular in Britain where there are millions of players and thousands of registered clubs, however it's quickly becoming an international pastime. The game is popular in the Netherlands, Germany and the Scandinavian countries. In the U.S. hundreds of thousands of dartboards are sold every year and millions of Americans play darts every week.

With more and more people obsessed with dart sport, tungsten is the well-known material to make a perfect dart. Because tungsten darts is high-density and durable, in the mean time, tungsten darts also have fine knurling and worthy of being collective.

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There are thousands of people around the world who suffer from the tungsten dart throwing condition called, dartitis. Although there are many interpretations of this dart throwing condition, Dartitis is the inability of a person to throw fluid and deliberate tungsten darts at the dartboard. While there are many things a tungsten dart player can do to correct this problem, visualization is one of keys to solving this problem. A lot of money has been spent on sports psychology for big money sports like baseball, football and golf. Golf is the closest of these sports to tungsten darts because of the psychology of perfection that is involved in both sports. Putting a golf ball is a results driven activity, just like tungsten darts. The golfer’s version of dartitis is called the yips – when you just can’t seem to get the putter absolutely right so you “yip” in the middle of your swing and ruin your putt. Dartitis is different from golf’s “yip” in that an object actually leaves your hand. So it’s much easier to over-control the tungsten dart. Perfection is a very cruel master, but here are a few tips to teach you how to minimize the effects of dartitis:

Review your throw from another perspective. Have a friend video-tape your throw during a competitive match. Or have him take a bunch of digital photos of you throwing throughout the night. This will give you insight on how your swing breaks down mechanically and can lead to technical ideas on how to correct your case of dartitis. Then take some time to analyze the tape/photos instead of practicing. Create a mental picture of your tungsten dart throw you can recall when you’re on the line to take your mind off the dartitis. Taking some time off to do this “research” will also make sure you aren’t over-throwing and getting physically and emotionally drained. When you’re rested mentally and physically you will shoot much more relaxed and calm at the dart line.

Watch your tungsten dart, not the board. Change your perspective by watching your dart flying through the air and landing in your target. When practicing take 10 minutes to do the following drill: Shake out your arm. Aim at your target. Before you throw, switch your eyes to the tungsten dart in your hand and watch it fly into the board. Don’t worry about where it lands at first. Just get used to how the tungsten dart looks in the air. As you get comfortable you’ll start hitting your targets while looking at the dart. The key to this drill is to recall how your darts looked in the air when you resume throwing normally. It takes the focus off the board and should help to ease the symptoms of dartitis.

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The game of 801 Tungsten Darts is a test of your endurance. It is typically played with four players on one team. You can play it as a single-in, double-out or double-in, double-out. Here are some tips that can help you improve your chances of winning.

Stay focused on the game. With eight people throwing it can be easy to turn your focus away from the board between your throws. Make sure you have taken care of everything before the match, i.e. beer, smokes, bathroom break. Otherwise you run the risk of feeling anxious at the line because you took a break from the competitive atmosphere.

Beat your partners' throws. A fun game within the dart game of 801 is to try to beat the score of your partners who throw ahead of you. It’s a great way to stimulate the team to consistently throw high scores. Another idea is for each player to kick in one dollar before the 801 game starts and the person who shot the highest score wins the pot at the end of the match.

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