Discussion
Electrostatic separation exploits differences in
Answer: B
Correct answer: Surface electrical conductivity
Electrostatic separation exploits differences in how readily a particle's surface accepts and holds a charge. The material is charged, usually by contact or by an ionising field, and passes over a rotating earthed drum: conductive particles lose their charge to the drum and leave immediately, while non-conductive particles retain it, cling to the drum and are carried further before release.
It is used where the fractions match closely in size, shape and density but differ in surface character - some weed seeds from crop seed, for instance.
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