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Which separators are used to separate oversize pebbles and undersize clay particles if minerals such as monazite, zircon are present?

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Which separators are used to separate oversize pebbles and undersize clay particles if minerals such as monazite, zircon are present?

(a) Revolving trommel

(b) Shaking tables

(c) Humphrey spirals

(d) Magnetic and electrostatic separators

I got this question during an internship interview.

This is a very interesting question from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Correct option is (c) Humphrey spirals

Easiest explanation: Generally revolving trommel is used for separation. If minerals like rutile and tin are present shaking tables or Humphrey spirals are used and if minerals like monazite, zircon are present magnetic and electrostatic separators are used.

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