Would you like to know how to manufacture the industrial rare gas? Although the industrial gas is usually the nitrogen, but it not as rare gas. Nitrogen is air separated, rectified from the air cryogenic liquefied, then the nitrogen and oxygen can be got etc.
Helium is mainly from the natural gas, because its content in the air is too little, some mineral resources of the natural gas contain much Helium. It can be air separated by liquefaction, Helium is one kind of rare resources, it is really little in the earth, it is basically non-renewable resources, the price is increasing recent years.
Certainly, Helium is also got form the air separation, because Helium and neon are really difficult to liquefaction, the small amount of Helium and Neon mixture can be got from air after liquefaction, Helium and Neon can be got form the further separation.
A lot of people do not know what kind of other usage except the inflatable ball, but a lot of analyzers being used on science will use the Helium.
Neon is mainly used on neon light filling, it is mainly manufactured by air separation, although its concentration is really little.
The Argon content is rich in the air, (which is close 1%), it can be easily got from the air separation. So, it is really cheap as a protective gas. This is the reason why the argon arc welding is often to be seen, while not the Helium arc welding or the Neon welding.