Magnetic separation for school working science projects very cheap

Magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. This separation technique can be useful in mining iron as it is attracted to a magnet. In mines where wolframite was mixed with cassiterite, such as South Crofty and East Pool mine in Cornwall or with bismuth such as at the Shepherd and Murphy mine in Moina, Tasmania, magnetic separation was used to separate the ores. At these mines a device called a Wetherill's Magnetic Separator (invented by John Price Wetherill, 1844–1906) was used. In this machine the raw ore, after calcination was fed onto a moving belt which passed underneath two pairs of electromagnets under which further belts ran at right angles to the feed belt. The first pair of electromagnets was weakly magnetised and served to draw off any iron ore present. The second pair were strongly magnetised and attracted the wolframite, which is weakly magnetic. These machines were capable of treating 10 tons of ore a day.This process of separating magnetic substances from the non-magnetic substances in a mixture with the help of a magnet is called magnetic separation.
to see how it work click here

I made a model of magnetic separation and it is woking superb i posted a video on youtube watch link is below
http://www.youtube.com/watch?v=bFdfdilXGeA

the things i used to make this are

• 2 x 12v DC motor 
• 2 x big pulleys 
• 2 x small pulleys  
• 2 x elastic bands
• 3 x round magnets
• 2 x 1'' PVC pipe
• some cloth for conveyor belt
• some wood 
• 4 x Bearings
• 1 x transformer 12v 
• 1 x rectifier 
• some match boxes

Thats all And its very simple to make Have a look what i made on youtube

http://www.youtube.com/watch?v=bFdfdilXGeA

if u need help mail me @ matharurajat@gmail.com