Electrostatic separation of minerals
|Location||21th symposium on geosciences|
|Holding Date||24 May 2008|
Electrostatic separation of minerals (insulators and conductors) was investigated experimentally by two methods of contact and induction charging. Experiments showed that, if a mixture of insulators in size of 0.2 to 0.4 mm, have enough contact with each other, different materials acquire different charge and in falling in an electric and gravity fields separate from each other. The electric charge of separated materials was in accord with others works.
The separation of a mixture of insulators and conductors was not effective with contact charging method but they were separated well by induction charging. Experiments showed that the duration of contact of different materials had an effective role in their separation but the kind of metal that had contact with them was not effective; in other words, the work function of metals in contact with minerals had not an effective role in the separation of minerals. Separation of particles with size less than 0.1 mm was not possible, probably due to adhesion of these particles. Humidity deteriorated the separation of minerals and therefore these must be derived sufficiently before separation.